Updated on 2024/02/28

写真a

 
AZHARI, Saman
 
Affiliation
Faculty of Science and Engineering, Information, Production, and Systems Center
Job title
Assistant Professor(without tenure)
Degree
Doctor of Philosophy - PhD ( 2020 Universiti Putra Malaysia )
Mail Address
メールアドレス

Research Experience

  • 2022.04
    -
    Now

    Waseda University   Graduate School of Information Production and Systems   Assistant professor   Assistant professor (without tenure)

  • 2020.01
    -
    2022.03

    Kyushu Institute of Technology   Graduate School of Life Science and Systems Engineering Department of Human Intelligence Systems   Postdoctoral researcher   Postdoctoral researcher

  • 2015.08
    -
    2016.01

    Universiti Putra Malaysia   Institute of Advanced Technology   Research assistant   Research assistant

Education Background

  • 2016.01
    -
    2020.02

    Universiti Putra Malaysia   Institute of Advanced Technology/Institute of Nanoscience and Nanotechnology   Nanotechnology  

  • 2013.01
    -
    2016.01

    Universiti Putra Malaysia   Institute of Advanced Technology/Institute of nanoscience and nanotechnology   Nanotechnology  

  • 2008.09
    -
    2012.08

    UCSI University   Engineering   Bachelor of Electrical and Electronics Engineering  

Research Areas

  • Electric and electronic materials   Remote sensing via wirelessly powered porous multiwalled carbon nanotubes/polydimethylsiloxane nanocomposite / Power engineering   Wireless power transmission via inductive coupling / Nanobioscience   Bioreduction of metal nanoparticles / Nanostructural physics   Piezoresistive pressure sensing via Carbon nanotubes/Polydimethylsiloxane composite / Applied physical properties   Singlewalled carbon nanotubes-Polyoxometalate nanocomposite for reservoir computing / Nanometer-scale chemistry   Purification and functionalization of carbon nanotubes / Nanomaterials   Synthesis and characterization of carbon nanotubes / Composite materials and interfaces   Carbon nanotubes-Polydimethylsiloxane nanocomposite
 

Papers

  • High Performance of an In-Material Reservoir Computing Device Achieved by Complex Dynamics in a Nanoparticle Random Network Memristor

    Oradee Srikimkaew, Deep Banerjee, Saman Azhari, Yuki Usami, Hirofumi Tanaka

    ACS Applied Electronic Materials    2024.02

    DOI

    Scopus

  • Wireless Biosensors for Healthcare: Smart Contact Lenses and Microbial Devices

    Saman Azhari, Gábor Méhes, Takeo Miyake

    Wearable Biosensing in Medicine and Healthcare     151 - 177  2024.01

    DOI

  • Influence of junction resistance on spatiotemporal dynamics and reservoir computing performance arising from an SWNT/POM 3D network formed via a scaffold template technique

    Saman Azhari, Deep Banerjee, Takumi Kotooka, Yuki Usami, Hirofumi Tanaka

    Nanoscale    2023

    DOI

  • Integration of wireless power transfer technology with hierarchical multi-walled carbon nanotubes-Polydimethylsiloxane piezo-responsive pressure sensor for remote force measurement

    Saman Azhari, Kouki Kimizuka, Gabor Mehes, Yuki Usami, Yasuhiko Hayashi, Hirofumi Tanaka, Takeo Miyake

    IEEE Sensors Journal   23 ( 7 ) 1 - 1  2023

    DOI

  • In-materio computing in random networks of carbon nanotubes complexed with chemically dynamic molecules: a review.

    Hirofumi Tanaka, Saman Azhari, Yuki Usami, Deep Banerjee, Takumi Kotooka, Oradee Srikimkaew, Thien-Tan Dang, S. Murazoe, Rikuto Oyabu, Kouki Kimizuka, Masaya Hakoshima

    Neuromorph. Comput. Eng.   2 ( 2 ) 22002 - 22002  2022

    DOI

    Scopus

    8
    Citation
    (Scopus)
  • Emergence of In-Materio Intelligence from an Incidental Structure of a Single-Walled Carbon Nanotube-Porphyrin Polyoxometalate Random Network

    Deep Banerjee, Takumi Kotooka, Saman Azhari, Yuki Usami, Takuji Ogawa, James K. Gimzewski, Hakaru Tamukoh, Hirofumi Tanaka

    ADVANCED INTELLIGENT SYSTEMS   4 ( 4 ) 2100145 - 2100145  2022.01

     View Summary

    Hardware-based machine intelligence with the network architecture of reservoir computing (RC) is gaining interest because of its biological computational resemblance along with an easy and efficient neural network training approach. Herein, such a physical RC (in-materio RC) platform consisting of a recurrent network formed by the single-walled carbon nanotube (SWNT)-porphyrin polyoxometalate (Por-POM) complex is demonstrated. The network architecture executes the fundamental reservoir properties of nonlinearity, higher harmonic generation, and 1/f(gamma) power law information processing ability. Based on these functionalities, an RC benchmark task of waveform generation is performed where the device achieves maximum fitting accuracy of 99.4%. Furthermore, a supervised object classification task based on a one-hot vector target is also executed using Toyota Human Support Robot tactile inputs. The successful classification of objects of different hardness is enhanced when the device output response follows the 1/f(gamma) power law of maximized information processing.

    DOI

  • Toward Automated Tomato Harvesting System: Integration of Haptic Based Piezoresistive Nanocomposite and Machine Learning

    Saman Azhari, Takuya Setoguchi, Iwao Sasaki, Arata Nakagawa, Kengo Ikeda, Alin Azhari, Intan Helina Hasan, Mohd Nizar Hamidon, Naoto Fukunaga, Tomohiro Shibata, Hirofumi Tanaka

    IEEE Sensors Journal   21 ( 24 ) 27810 - 27817  2021.12

     View Summary

    Carbon nanotubes (CNT)/polydimethylsiloxane (PDMS) have been investigated as potential materials for tomato-harvesting applications. The current-voltage (I-V) and current time (I-t) properties, as well as tomato hardness measurement and support-vector machine learning, were used to determine the performance of the sensor with respect to sensitivity, response time, accuracy, and detection limit of the nanocomposite. The data suggested an accurate (± 5.2%) measurement in a low-weight region of tomato. Narrowing of the I-V hysteresis curve towards a higher weight region was observed as a result of the increase in electron pathways. The fabricated sensor displayed a higher sensitivity (15 mV / mu text{m} ) than the commercial sensor (1 mV / mu text{m} ). In addition, machine learning of the resistance-displacement curve data yielded an average accuracy level of 0.67 when tested using acquired data.

    DOI J-GLOBAL

    Scopus

    4
    Citation
    (Scopus)
  • Room temperature demonstration of in-materio reservoir computing for optimizing Boolean function with single-walled carbon nanotube/porphyrin-polyoxometalate composite

    Deep Banerjee, Saman Azhari, Yuki Usami, Hirofumi Tanaka

    Applied Physics Express   14 ( 10 )  2021.10

     View Summary

    A method for room temperature demonstration of in-materio reservoir computing (RC) with a single-walled carbon nanotube/porphyrin-polyoxometalate network (SWNT/Por-POM) is proposed. Boolean functions of OR, AND, NOR, NAND, XOR, and XNOR, all were reconstructed with an accuracy >90% via supervised training of linear voltage readouts. The RC pre-requisite of echo-state property and recurrent connection allowed for consistent performances over multiple test datasets and time-shifted target sequences. Moreover, a non-zero machine intelligence index confirmed the presence of negative differential resistance dynamics, incorporating in SWNT/Por-POM the mathematical equivalence of additive and subtractive functions, thereby aiding the construction of such complex Boolean functions.

    DOI J-GLOBAL

    Scopus

    9
    Citation
    (Scopus)
  • Performance of Ag-Ag<inf>2</inf>S core-shell nanoparticle-based random network reservoir computing device

    Hadiyawarman, Yuki Usami, Takumi Kotooka, Saman Azhari, Masanori Eguchi, Hirofumi Tanaka

    Japanese Journal of Applied Physics   60 ( SC )  2021.06

     View Summary

    Reservoir computing (RC), a low-power computational framework derived from recurrent neural networks, is suitable for temporal/sequential data processing. Here, we report the development of RC devices utilizing Ag-Ag2S core-shell nanoparticles (NPs), synthesized by a simple wet chemical protocol, as the reservoir layer. We examined the NP-based reservoir layer for the required properties of RC hardware, such as echo state property, and then performed the benchmark tasks. Our study on NP-based reservoirs highlighted the importance of the dynamics between the NPs as indicated by the rich high dimensionality due to the echo state property. These dynamics affected the accuracy (up to 99%) of the target waveforms that were generated with a low number of readout channels. Our study demonstrates the great potential of Ag-Ag2S NPs for the development of next-generation RC hardware.

    DOI J-GLOBAL

    Scopus

    9
    Citation
    (Scopus)
  • Nickel zinc ferrite thick film with linseed oil as organic vehicle for microwave device applications

    Intan Helina Hasan, Mohd Nizar Hamidon, Alyani Ismail, Ismayadi Ismail, Nur Alin Mohd Azhari, Muhammad Asnawi Mohd Kusaimi, Saman Azhari

    Materials Chemistry and Physics   236  2019.10

     View Summary

    The properties of nickel zinc ferrite (Ni0·5Zn0·5Fe2O4) thick film with Ni0·5Zn0·5Fe2O4 nanopowders as active powders and linseed oil as the organic vehicle is studied and investigated in this work. Ni0.5Zn0.5Fe2O4 thick film paste samples have been prepared with various weight ratios to study the rheology properties of the pastes. Rheology results show that paste with 30% wt. Ni0.5Zn0.5Fe2O4 has suitable rheological shear-thinning behavior, which is required for formulating screen printing pastes. Dielectric and magnetic properties of the thick film show values lower than bulk Ni0·5Zn0·5Fe2O4, which is relatable to the weight ratio of the ferrite in thick film and thickness of approximately 20 μm. With a low firing temperature of 200 °C, a screen printed microstrip patch antenna with a Ni0·5Zn0·5Fe2O4 thick film layer as substrate overlay has an increase in return loss by 64.22% and also increase in bandwidth by 84.61%, which has shown great potential for microwave devices applications.

    DOI J-GLOBAL

    Scopus

    7
    Citation
    (Scopus)
  • Nickel Zinc Ferrite Thick Film for Optimized Performance of Flexible Patch Antenna

    Intan Helina Hasan, Mohd Nizar Hamidon, Ismayadi Ismail, Alyani Ismail, Muhammad Asnawi Mohd Kusaimi, Saman Azhari

    Proceeding - 2019 International Symposium on Electronics and Smart Devices, ISESD 2019   2019 ( ISESD )  2019.10

     View Summary

    This work investigated the effect of adding nickel zinc ferrite thick film layer to a flexible substrate as overlay below a conductive silver patch. The ferrite thick film paste was prepared by mixing nickel zinc ferrite (NZF) nanopowders with an organic vehicle, and later using screen printing technique to print a thick film layer onto polyimide film, and later added a rectangle silver conductive patch on top of the ferrite layer. Measurement results of the flexible patch antenna with NZF thick film layer show that the thick film significantly widens the bandwidth of the antenna while having good return loss. The bending test, however, showed that there are significant changes of frequency and return loss when the antenna was bent at different angles, showing that further improvement is needed to further stabilizes the antenna parameters in bent conditions.

    DOI J-GLOBAL

    Scopus

  • Rheology Properties of Carbon Nanotube Thick Film Paste for Potential Application in Patch Antenna

    Intan Helina Hasan, Mohd Nizar Hamidon, Ismayadi Ismail, Muhammad Asnawi Mohd Kusaimi, Saman Azhari, Farah Nabilah Shafiee

    Proceedings of the 2019 IEEE Regional Symposium on Micro and Nanoelectronics, RSM 2019   2019 ( RSM ) 109 - 111  2019.08

     View Summary

    This work investigated the effect of various carbon nanotube (CNT) powders' weight ratio for the preparation of CNT thick film paste. CNT pastes have been prepared with powder weight ratios of 5 wt%, 10wt%, 15wt% and 20wt% to study the rheological properties of the paste. Results show that pastes with a weight ratio of 15wt% and 20wt% have high viscosity at a low shear rate and decreasing viscosity as shear rates increases. This shear-thinning rheological behaviour is found to be suitable for screen printing pastes. Measurement results of CNT thick film patch antenna show that CNT thick film significantly widens the bandwidth of the antenna while having good return loss. The frequency shift as compared with an antenna with the silver conductive film however notably increases, indicating that electrical properties of CNT patch are lower than those of silver patch, which may occur due to the defects of CNTs in the paste.

    DOI J-GLOBAL

    Scopus

    1
    Citation
    (Scopus)
  • Effect of Yttrium Iron Garnet Thick Film in Fabrication of Flexible Microstrip Patch Antenna

    Intan Helina Hasan, Mohd Nizar Hamidon, Alyani Ismail, Ismayadi Ismail, Nur Alin Mohd Azhari, Saman Azhari, Muhammad Asnawi Mohd Kusaimi, Rosiah Osman

    2019 Electron Devices Technology and Manufacturing Conference, EDTM 2019   2019 ( EDTM ) 389 - 391  2019.03

     View Summary

    In this work, yttrium iron garnet (YIG) thick film paste was printed onto Kapton polyimide film to form a substrate overlay, which then a silver patch was printed onto it to form a flexible microstrip patch antenna (MPA). Measurement results showed that the flexible MPA with YIG thick film inclusion showed improved return loss, as well as having good stability when the MPA is being bent.

    DOI J-GLOBAL

    Scopus

    1
    Citation
    (Scopus)
  • Effect of firing temperature on surface morphology of nanosized ferrite-based thick film with linseed oil as organic vehicle

    Intan Helina Hasan, Mohd Nizar Hamidon, Muhammad Asnawi Mohd Kusaimi, Saman Azhari, Nur Alin Mohd Azhari, Rosiah Osman, Juraina Md Yusof, Ismayadi Ismail

    International Journal of Nanotechnology   16 ( 11-12 ) 660 - 667  2019

     View Summary

    This paper presents the results of morphological study on nanosized nickel zinc ferrite (NZF) thick film using linseed oil as organic vehicle and nanosized NZF powder. First, NZF nanopowder is mixed with organic vehicle which consists of linseed oil, m-xylene and α-terpineol. Paste samples were screen printed onto alumina as substrate, dried and fired at different temperatures of 100°C, 200°C, and 300°C, respectively. Microscopic images of the samples and elemental analysis were observed to determine good dispersion of the active powder with the organic vehicle. Based on the results, the nanoparticles were uniformly dispersed, and images of thick films fired at 200°C and 300°C have shown clearly visible particles, indicating that at these temperatures, the organic vehicle has started to evaporate on the surface, revealing nanoparticles of the active powders. The elemental analysis confirmed this idea, of which carbon element of the organic vehicle gradually decreased with increasing temperature.

    DOI

    Scopus

  • A better understanding of CNTs chemical purification and functionalization processes

    Saman Azhari, Mohd Nizar Hamidon, Intan Halina Hasan, Muhammad Asnawi, Siti Amaniah Mohd Chachuli, Alin Azhari, Ismayadi Ismail

    IEEE International Conference on Semiconductor Electronics, Proceedings, ICSE   2018-August ( ICSE ) 25 - 28  2018.10

     View Summary

    Purification and functionalization of carbon nanotubes have been examined using different acid treatments. CNTs treatment may vary depending on the desired outcome. The results show that HCl as a strong acid, oxidizes all the materials present in the sample. HNO3acts as an oxidizing agent which is useful to produce functional CNTs. H2O2behaves as a regulator in presence of both acids. The results suggest that H2O2may be a critical element to control the outcome of CNTs purification and functionalization process.

    DOI J-GLOBAL

    Scopus

    2
    Citation
    (Scopus)
  • Nickel zinc ferrite thick film as substrate overlay for improved performance of microstrip patch antenna

    I. H. Hasan, M. N. Hamidon, A. Ismail, I. Ismail, M. A.M. Kusaimi, S. Azhari, N. A.M. Azhari, R. Osman

    IOP Conference Series: Materials Science and Engineering   380 ( 1 )  2018.07

     View Summary

    In this paper, nickel zinc ferrite (NZF) nanopowder was mixed with organic vehicle which consists of linseed oil, m-xylene and α-terpineol. Then the mixture was sonicated for 1 hour at 40°C in order to obtain homogenous paste, followed by printing it onto FR4 substrate using the screen printing technique to form the NZF thick film layer before dried at 100°C and later fired at 200°C. A basic square shape patch antenna by using silver paste was printed onto the NZF thick film layer and was compared with another patch antenna which was been printed without the NZF layer. The results showed that the antenna with NZF thick film layer has return loss of -10.97dB, resonant frequency 6.42GHz, bandwidth 3.9 and Q factor of 1.646, which is better compared to the antenna without the layer by 32.81%, 3.22%, 86.60% and 44.69% respectively.

    DOI

    Scopus

    4
    Citation
    (Scopus)
  • YIG Thick Film as Substrate Overlay for Bandwidth Enhancement of Microstrip Patch Antenna

    Intan Helina Hasan, Mohd Nizar Hamidon, Alyani Ismail, Ismayadi Ismail, Anwer Sabah Mekki, Muhammad Asnawi Mohd Kusaimi, Saman Azhari, Rosiah Osman

    IEEE Access   6   32601 - 32611  2018.05

     View Summary

    Research on microstrip patch antenna (MPA) has been growing in the past few decades due to its planar profile and easy fabrication. Its simplicity of structure, which includes a conductive patch, a dielectric substrate, a ground plane, and a microstrip feeder, is making it more popular for integration in devices which are more focused on miniaturization and flexibility. There are, however, a few disadvantages of MPA, such as narrow bandwidth, low power, and limited inexpensive material selection if a current printed circuit board etching fabrication technique is used. Ferrite substrates are known to be able to help overcome this issue, but the properties of bulk ferrites are difficult to control. This paper aims to solve this problem by using thick-film technology, which utilizes a screen printing method to include ferrite thick film in the MPA structure as substrate overlay to help enhance the performance of MPA. Yttrium iron garnet was chosen as the starting ferrite nanopowders, and the preparation and characterization of the ferrite thick-film paste were carried out to investigate properties of the thick film. Results showed that the thick film showed moderate permittivity and permeability, which is suitable for MPA fabrication. The actual fabricated MPA with ferrite thick-film inclusion on FR4 substrate showed that the thick film improved the performance of MPA with low firing temperature of 200 °C. For MPA which is designed to work at 5.8 GHz, the return loss and -3-dB bandwidth improved 100% and 73%, respectively. In conclusion, ferrite thick-film inclusion in MPA fabrication has proven to improve the performance of the antenna in terms of return loss and bandwidth enhancement.

    DOI

    Scopus

    16
    Citation
    (Scopus)
  • Fabrication, functionalization, and dispersion of carbon nanotubes

    Taha Roodbar Shojaei, Saman Azhari

    Emerging Applications of Nanoparticles and Architectural Nanostructures: Current Prospects and Future Trends     501 - 531  2018.03

     View Summary

    Discovery of carbon nanotubes (CNTs) was beginning of a revolutionary path for material scientists. CNTs extraordinary properties made this wonder material an important alternative for scientists in all fields; although utilizing CNTs were not as simple as synthesizing them. Ever since the discovery, numerous platforms for synthesis of CNTs have been investigated. Depending on the necessity of the application in which CNTs are exploited different quality, yield, chirality, size, and properties are required. Nowadays the fabrication process mostly relies on arc discharge, laser ablation and chemical vapor deposition (CVD). One of the major drawbacks in exploitation of CNTs is their tenancy to aggregate due to the weak van der Waals forces present as a result of sp2 hybridization of carbon atoms. Due to the extraordinary mechanical, electrical, optical, chemical, physical, biological, and other features of CNTs, scientists began to work on different methods to overcome aggregation during utilization of CNTs. Dispersion of CNTs has been done via several functionalization processes. Each of these techniques has their own functionality. Functionalization of CNTs depends on two central techniques, covalent and noncovalent modifications, which are essential, to achieve desired characteristics that can be applied in wide range of applications. Therefore, in this chapter we will try to explain the CNTs fabrication techniques as well as the methods that have been utilized to increase the purity and dispersion of CNTs.

    DOI

    Scopus

    7
    Citation
    (Scopus)
  • Fabrication of flexible pressure sensor using carbon black/pdms

    Siti Nursyahirah Binti Abdul Hadi, Mohd Nizar Bin Hamidon, Saman Azhari

    IEEE Student Conference on Research and Development: Inspiring Technology for Humanity, SCOReD 2017 - Proceedings   2018-January ( SCOReD ) 7 - 12  2018.02

     View Summary

    Despite the fact of the technology has advanced, the fabrication of flexible pressure sensor still uses material that can bring harm to the environment. Therefore, this project is done to research on method that used more eco-friendly materials for the fabrication process on paste preparation while maintaining its performance in term of resistivity and conductivity by fabricating the flexible pressure sensor using Carbon Black/PDMS. Three flexible pressure sensors with different electrode designs were fabricated on the same substrate which is Kapton Film. The resistance of the three sensors was measured and resistivity and conductivity were extracted. Later two types of graphs were plotted for each sensor: The resistivity and conductivity of the sensors were analysed.

    DOI J-GLOBAL

    Scopus

  • Synthesis of Carbon Nanomaterials from Rice Husk via Microwave Oven

    Muhammad Asnawi, Saman Azhari, Mohd Nizar Hamidon, Ismayadi Ismail, Intan Helina

    Journal of Nanomaterials   2018  2018

     View Summary

    Microwave oven was utilized to fabricate carbon nanostructure, specifically CNTs, from waste RH powders. It has been shown that the use of carbon source, catalyst, and commercial microwave oven to induce plasma is necessary to carry on this synthesis. The plasma enhances and speeds up the catalytic decomposition of RH in presence of ferrocene. FESEM, TGA, and Raman spectroscopy were utilized to confirm the presence and quality of produced carbon nanomaterials. In addition, these results suggest the conversion of ferrocene to iron(II, III) oxide with notable conversion rate.

    DOI J-GLOBAL

    Scopus

    40
    Citation
    (Scopus)
  • Fabrication of piezoresistive based pressure sensor via purified and functionalized CNTs/PDMS nanocomposite: Toward development of haptic sensors

    Saman Azhari, Amin Termeh Yousefi, Hirofumi Tanaka, Amin Khajeh, Nico Kuredemus, Mani Mansouri Bigdeli, Mohd Nizar Hamidon

    Sensors and Actuators, A: Physical   266   158 - 165  2017.10

     View Summary

    In this work, we reported a chemically modified technique via screen printing method to fabricate carbon nanotubes (CNTs)/Polydimethylsiloxane (PDMS) nanocomposite to monitor the piezoresistive behavior of nanocomposite while applying pressure. Raman, UV/vis and HRTEM results were utilized to verify the quality of CNTs, purified through chemical and physical treatments; carboxylic and hydroxylic functional groups were determined via FTIR. The optimum dispersion ratio of the nanocomposite was observed by FESEM images which clearly show the consistent dispersion of CNTs coated by PDMS. Furthermore, I–V characterization of the developed nanocomposite indicates change in resistivity for a few orders of magnitude before and after treatment in addition to resistance variation as a result of different applied pressures. These results indicate the importance of CNTs treatment prior to nanocomposite fabrication in order to obtain lower percolation threshold. Obtained results are useful in development of haptic sensor, artificial finger, and brain like devices for robotics applications.

    DOI J-GLOBAL

    Scopus

    27
    Citation
    (Scopus)
  • Development of haptic based piezoresistive artificial fingertip: Toward efficient tactile sensing systems for humanoids

    Amin TermehYousefi, Saman Azhari, Amin Khajeh, Mohd Nizar Hamidon, Hirofumi Tanaka

    Materials Science and Engineering C   77   1098 - 1103  2017.08  [International journal]

     View Summary

    Haptic sensors are essential devices that facilitate human-like sensing systems such as implantable medical devices and humanoid robots. The availability of conducting thin films with haptic properties could lead to the development of tactile sensing systems that stretch reversibly, sense pressure (not just touch), and integrate with collapsible. In this study, a nanocomposite based hemispherical artificial fingertip fabricated to enhance the tactile sensing systems of humanoid robots. To validate the hypothesis, proposed method was used in the robot-like finger system to classify the ripe and unripe tomato by recording the metabolic growth of the tomato as a function of resistivity change during a controlled indention force. Prior to fabrication, a finite element modeling (FEM) was investigated for tomato to obtain the stress distribution and failure point of tomato by applying different external loads. Then, the extracted computational analysis information was utilized to design and fabricate nanocomposite based artificial fingertip to examine the maturity analysis of tomato. The obtained results demonstrate that the fabricated conformable and scalable artificial fingertip shows different electrical property for ripe and unripe tomato. The artificial fingertip is compatible with the development of brain-like systems for artificial skin by obtaining periodic response during an applied load.

    DOI PubMed J-GLOBAL

    Scopus

    15
    Citation
    (Scopus)
  • Simple Microwave-Assisted Synthesis of Carbon Nanotubes Using Polyethylene as Carbon Precursor

    N. Kure, M. N. Hamidon, S. Azhari, N. S. Mamat, H. M. Yusoff, B. M. Isa, Z. Yunusa

    Journal of Nanomaterials   2017  2017

     View Summary

    In this work, a quick and effective method to synthesize carbon nanotubes (CNTs) is reported; a commercial microwave oven of 600 W at 2.45 GHz was utilized to synthesize CNTs from plasma catalytic decomposition of polyethylene. Polyethylene and silicon substrate coated with iron (III) nitrate were placed in the reaction chamber to form the synthesis stock. The CNTs were synthesized at 750°C under atmospheric pressure of 0.81 mbar. Raman spectroscopy and field emission scanning electron microscope revealed the quality and entangled bundles of mixed CNTs from which the diameters of the CNTs were calculated to be between 1.03 and 25.00 nm. High resolution transmission electron microscope further showed that the CNTs obtained by this method are graphitized. Energy dispersive X-ray analysis and thermogravimetric analysis revealed above 98% carbon purity.

    DOI

    Scopus

    27
    Citation
    (Scopus)
  • Synthesis of carbon nanotubes using microwave oven

    Nicodemus Kure, Mohd Nizar Hamidon, Saman Azhari, Kamilu Iman Usman, Intan Helina Hasan, Ismayadi Ismail

    RSM 2015 - 2015 IEEE Regional Symposium on Micro and Nano Electronics, Proceedings     353 - 356  2015.12

     View Summary

    Advances in the synthesis of carbon nanotubes (CNTs) have emerged as a result of the properties and potential application of carbon nanotubes. We demonstrated a simple approach of using domestic microwave oven with 600W at 2.45 GHz which was modified to produce CNTs from a carbon source on coated silicon oxide substrate. The Raman spectroscopy showed the graphitic nature of the obtained CNTs, with intensity ratio ID/IG calculated to be 0.92. Field emission scanning electron microscope (FESEM) reveals CNTs are produced on the substrate surface with outer diameter range of 11-44 nm and length of about 0.25 μm. HRTEM further confirmed the graphitic nature of the CNTs obtained. The purity of the nanotubes was analyzed with energy dispersive X-ray (EDX) which showed atomic weight of 98% carbon purity. This paper shows that domestic microwave oven can be used to synthesize CNTs with polymer as the carbon source via plasma catalytic decomposition which was found to be fast, economical and clean technique.

    DOI

    Scopus

  • Printability and structural analysis of Yttrium iron garnet thick film with low firing temperature

    Intan Helina Hasan, Mohd Nizar Hamidon, Ismayadi Ismail, Rosiah Osman, Saman Azhari

    RSM 2015 - 2015 IEEE Regional Symposium on Micro and Nano Electronics, Proceedings     267 - 270  2015.12

     View Summary

    This paper presents results of study on Yttrium iron garnet (YIG) thick film paste using linseed oil as organic binder. YIG nanopowder is mixed with organic vehicle which consists of linseed oil, m-xylene and α-terpineol. Samples with different ratios of compositions are prepared to study the printability and adhesion properties of the paste. Paste samples were then screen printed onto alumina substrate, dried and fired at 300°C. Microscopic images of the samples were observed to determine most suitable ratio for producing YIG paste. Based on the results, YIG paste with 30 wt% ratio showed good adhesion to the substrate as well as having high dielectric property compared to pastes with lower powder ratio.

    DOI

    Scopus

    4
    Citation
    (Scopus)
  • Effect of aggregation on dielectric property of MWCNT/PDMS nanocomposite

    Saman Azhari, Mohd Nizar Hamidon, Kamilu Iman Usman, Intan Helina Hasan, Ismayadi Ismail, Kure Nicodemus

    RSM 2015 - 2015 IEEE Regional Symposium on Micro and Nano Electronics, Proceedings     361 - 364  2015.12

     View Summary

    Highly graphitized nucleophilic group functionalized Multiwall carbon nanotubes are utilized to fabricate PDMS/FMWCNTs nanocomposites with low weight fraction (0.1 wt%). The effect of solvents on dispersion of FMWCNTs is studied. THF shows higher dispersion power in comparison with chloroform. The dielectric constant is measured using impedance analyzer in the range of 106-109 Hz. The result indicate, the dielectric property of FMWCNTs/PDMS nanocomposite could be manipulated with proper mixing techniques and adjustment of curing time.

    DOI

    Scopus

    3
    Citation
    (Scopus)
  • Silicon nanowire interface circuit for biosensing applications

    Kamilu Iman Usman, Mohd Nizar Hamidon, Nor Azah Yusof, Saman Azhari, Intan Helina Hasan, Kure Nicodemus, Siti Fatimah Abd Rahman

    RSM 2015 - 2015 IEEE Regional Symposium on Micro and Nano Electronics, Proceedings     357 - 360  2015.12

     View Summary

    Detection and quantification of biological and chemical species are critical to many areas of the life sciences and health care, from disease diagnosis to drug screening. Central to detection is the transduction of the signal associated with the sensing event. Advances in nanotechnology have led to the development of the silicon nanowire which is faster, smaller, greener and cheaper. These nanowires have a very narrow diameter similar to that of the chemical and biological species to be sensed making them perfectly suited for biosensing. The top-down fabricated silicon nanowires is used in this work due to its oxide-coated surface and ease of integration with other microelectronic components. Due to the ultra-small output signal of the nanowire, bulky equipments which are often time consuming and expensive are used for reading the signal. This work attempts to build a circuit that can be interfaced with the nanowire to make the signal readable hence the sensor will become portable thereby increasing its utility to being a point-of-care and field-testing device.

    DOI

    Scopus

    1
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    (Scopus)

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Books and Other Publications

  • Emerging Applications of Nanoparticles and Architecture Nanostructures Current Prospects and Future Trends

    ( Part: Contributor)

    Elsevier  2018.01 ISBN: 9780323512541

Research Projects

  • Development and bio-implementation of small pressure sensor with microscale array toward artificial skin application

    Asahi-Kosan group Research support program 

    Project Year :

    2021.04
    -
    2024.03
     

Misc

  • Reservoir computing enhancement in three-dimensional porous CNT-POM network

    AZHARI Saman, BANERJEE Deep, KOTOOKA Takumi, USAMI Yuki, TANAKA Hirofumi

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   68th   263 - 263  2021

    DOI J-GLOBAL

  • Time delay reservoir computing with nanomaterials as memory device

    Nakao Yusuke, usami yuki, Tanaka Hirofumi, Azhari Saman, yawarman Hadi

    JSAP Annual Meetings Extended Abstracts   68th   1670 - 1670  2021

    DOI J-GLOBAL

  • Reservoir computing in three-dimensional porous CNT-POM network

    AZHARI Saman, BANERJEE Deep, KOTOOKA Takumi, USAMI Yuki, TANAKA Hirofumi

    ナノ学会大会講演予稿集   19th  2021

    J-GLOBAL

  • In-materio supervised Boolean logic operation by random network of single-walled carbon nanotube/porphyrin-polyoxometalate

    DEEP Banerjee, AZHARI Saman, USAMI Yuki, TANAKA Hirofumi

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   82nd  2021

    J-GLOBAL

  • Influence of device topology on in-materio reservoir computing

    AZHARI Saman, BANERJEE Deep, MURAZOE Shuho, KOTOOKA Takumi, USAMI Yuki, USAMI Yuki, TANAKA Hirofumi, TANAKA Hirofumi

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   82nd  2021

    J-GLOBAL

  • Influence of hydrophilicity on hydrogen gas sensing properties of TiO2 nanowires

    AZHARI Saman, HAMIDON Mohd Nizar, TANAKA Hirofumi

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   67th   1725 - 1725  2020

    DOI J-GLOBAL

  • Physical reservoir fabrication by various materials

    田中啓文, 田中啓文, 琴岡匠, DEEP Banerjee, HADIYAWARMAN, HADIYAWARMAN, AZHARI Saman, AZHARI Saman, 宇佐美雄生, 宇佐美雄生

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   81st   222 - 222  2020

    DOI J-GLOBAL

  • Importance of hydrophilicity on hydrogen gas sensing properties of TiO2 nanotubes

    AZHARI Saman, AZHARI Saman, HAMIDON Mohd Nizar, TANAKA Hirofumi, TANAKA Hirofumi

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   81st   1287 - 1287  2020

    DOI J-GLOBAL

  • Fabrication and evaluation of tactile sensor using carbon foam

    池田健吾, AZHARI Saman, 佐々木巌, 宇佐美雄生, 田中啓文

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   81st   2245 - 2245  2020

    DOI J-GLOBAL

  • Highly sensitive Piezoresistive nanocomposite for haptic sensing applications: toward automation of tomato harvesting

    池田健吾, 佐々木巌, Azhari Saman, Azhari Saman, 瀬戸口卓也, 中川新, Hamidon Mohd Nizar, 田中啓文

    日本表面真空学会学術講演会要旨集(Web)   2019   1Ca12  2019

     View Summary

    CNTs/PDMS as a promising nanocomposite for tomato harvesting application has been investigated. The I-V and I-t characteristics as well as tomato hardness measurement and support-vector machine learning was utilized to determine the performance of the sensor in terms of nanocomposite. The data suggested an accurate and stable measurement in a low weight region of tomato. The I-V hysteresis reduced substantially towards higher weight region as a result of increase in electrons pathways. The fabricated sensor displayed higher sensitivity than the commercial sensor. In addition, machine learning of resistance-displacement curve data suggested 0.67 accuracy when tested with acquired data.

    DOI CiNii J-GLOBAL

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Industrial Property Rights

  • Classification device and Robot with classification device

    Hirofumi Tanaka, Yuki Usami, Kouki Kimizuka, Saman Azhari, Ahmet Karacali

    Patent

  • Sensor of physical parameter, robot with sensor and sensing method

    Hirofumi Tanaka, Yuki Usami, Saman Azhari, Kouki Kimizuka

    Patent

  • Three-dimensional electronic device, machine learning system with device, and fabrication process

    Hirofumi Tanaka, Yuki Usami, Saman Azhari

    Patent

  • Three-dimensional electronic device and machine learning system with device

    Hirofumi Tanaka, Yuki Usami, Saman Azhari

    Patent

 

Internal Special Research Projects

  • Tunable 3D reservoir computing using SWCNT-PVA nanocomposite via manipulation of junction resistance

    2023   Saman Azhari

     View Summary

    The tunability of aphysical reservoir computing device is a challenge and difficult to rectify.This is mainly due to the complexity of the charge transfer mechanism innanostructures used to make a microdevice. The randomness of the nanomaterialnetwork is suggested to improve the physical reservoir computing performance,but such randomness makes it even more challenging to identify the source ofperformance improvement or decline. &nbsp;Duringthis year, we aimed to fabricate a tunable 3D reservoir computing device usingSWCNT-PVA nanocomposite via manipulation of junction resistance. We were able tofabricate a 3D porous network of SWCNT-PVA nanocomposite successfully. However,an issue arose during the measurement of reservoir computing performance due tothe low mechanical stability of the nanocomposite. The nanocomposite was softand deformable and unable to recover its original state, making it challengingto perform a stable and reliable reservoir computing performance assessment. Inaddition, the high-water susceptibility of PVA made it difficult to performfurther analysis on the nanocomposite. Although I do believe there are otherapplications for SWCNT-PVA porous nanocomposite in the current state, it is notsuitable as a physical reservoir computing device. The current issue couldpossibly be rectified by introducing additives to improve the mechanicalstability of the nanocomposite. So far, the reservoir computing performance of SWCNT-PVAnanocomposite results have been inconclusive, but I am in the process ofimproving the structural stability. My research on physicalreservoir computing did not stop due to the challenges I faced. While workingon SWCNT-PVA, as a result of my collaboration with Professor Hirofumi Tanaka ofthe Kyushu Institute of Technology, we were able to publish an article in ACS AppliedElectronic Materials with the title “High Performance of an In-MaterialReservoir Computing Device Achieved by Complex Dynamics in a NanoparticleRandom Network Memristor.”

  • Development of electromagnetic reservoir computing system via wireless power transmission technology for voice classification and word prediction tasks

    2022   Takeo Miyake, Hirofumi Tanaka, Gabor Mehes, Yuki Usami

     View Summary

    In the development of an electromagnetic (EM) reservoircomputing system for classification tasks, inputting data and measuringinterferences in the EM field pose a challenge. We have developed a system thatconverts high-frequency AC signals to DC to overcome the high-frequencysampling difficulties. The system uses a piezoresistive material to inducechanges in the EM field between the transmitter and receiver, which are thenobserved as a DC voltage drop in the transmitter. These changes serve as ameans of measurement for inputting data into the EM reservoir.&nbsp;Our research has successfully addressed the challenges ofinputting data and measuring interferences in the EM field for a reservoircomputing system. The next step is to increase the number of output nodes toenhance the accuracy of the tasks performed by the system. The results of ourwork, titled "Integration of wireless power transfer technology withhierarchical multi-walled carbon nanotubes-Polydimethylsiloxanepiezo-responsive pressure sensor for remote force measurement", arecurrently under review by IEEE Sensor.&nbsp;In conclusion, our findings demonstrate the potential of usingthe EM field as a reservoir computing system to perform time-dependent andclassification tasks. The system has numerous potential applications and couldhave significant implications in various fields.