ElecTronic Center

Kuala Selangor, Malaysia

ElecTronic Center

Kuala Selangor, Malaysia
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Suriani A.B.,Sultan Idris University of Education | Alfarisa S.,Sultan Idris University of Education | Mohamed A.,Sultan Idris University of Education | Isa I.M.,Sultan Idris University of Education | And 4 more authors.
Materials Letters | Year: 2015

Quasi-aligned carbon nanotubes (CNTs) were successfully synthesised for the first time using waste engine oil (WEO) as the carbon source via thermal chemical vapour deposition (TCVD). The high carbon content of WEO was believed to promote the growth of the quasi-aligned CNTs. The synthesis process was performed at precursor and synthesis temperatures of 500 and 750 °C, respectively, with a ferrocene catalyst concentration of 17.99 wt%. Typical characterisation methods were employed to examine the CNTs: electron microscopy, energy dispersive X-Ray, X-ray diffraction and micro-Raman spectroscopy. The ability of CNT samples to emit electrons was also investigated by field electron emission (FEE) analysis. Electron microscopy and micro-Raman analysis revealed a dense mixture of quasi-aligned single- and multi-walled CNTs with a moderate ID/IG ratio of 0.90. The overall diameters of the CNTs ranged from 18.0 to 29.8 nm, with the diameters of the single-walled CNTs estimated to be between 0.6 and 1.1 nm. The FEE results showed that the quasi-aligned CNTs synthesised from WEO exhibited reasonable turn-on and threshold fields of 4.1 and 7.2 V μm-1, which corresponded to current densities of 0.1 and 1.0 μA cm-2, respectively. This study highlights WEO as a new, cheap, abundant and easily available carbon source for quasi-aligned CNTs production with a potential application in electron emission devices. © 2014 Elsevier B.V.

Rahim N.A.A.,Microwave Technology Center | Kara M.H.,Electronic Center | Mahmood M.R.,University Technology of MARA
2014 IEEE Asia-Pacific Conference on Applied Electromagnetics, APACE 2014 - Proceeding | Year: 2015

The experimental results for high-frequency characteristics (from 2 to 20 GHz) of graphene films are presented. Samples with multi-layer graphene were fabricated and characterized from curve-fitting experimental results with values simulated using an electromagnetic simulator. From RF two-port network experiments, the circuit parameters of capacitance, resistance and inductance were extracted using a physics-based RLC lumped element circuit model that consists of contact pads and graphene electrodes using a commercially available microwave circuit simulator. The proposed model reproduced all the measured characteristics, and the component values which gave the best fit with the measurements were successfully extracted from the model. Our findings demonstrate that the measured RF performance of multilayer graphene (MLG)-based transmission lines gave good agreement with simulation predicted by a lumped element RLC model. © 2014 IEEE.

Md Sin N.D.,ElecTronic Center | Mamat M.H.,ElecTronic Center | Rodzi A.S.,University of Zagreb | Rodzi A.S.,University Technology of MARA | Rusop M.,ElecTronic Center
AIP Conference Proceedings | Year: 2011

The electrically conductive zinc oxide (ZnO) nanostructures prepared by sol-gel spin coating are presented. This project has been focused on electrical, optical and surface morphology properties of Al (aluminium) doped ZnO thin film. The effect of Al doping concentration at 0∼5 at.% on the Al doped ZnO Thin film properties have been investigated. This project involves 3 processes which are thin film preparation, deposition and characterization. The thin films were characterized using Current-Voltage (I-V) measurement and UV-Vis-NIR spectrophotometer for electrical properties and optical properties respectively. The surface morphology has been characterized using field emission scanning electron microscope (FESEM). The I-V measurement result indicated electrical properties of Al doped ZnO thin film improved with Al doping. The absorption coefficient spectra obtained from UV-Vis-NIR spectrophotometer measurement show all films have low absorbance in visible and near infrared (IR) region but have high UV absorption properties. The FESEM investigations show that the nanoparticles size becomes smaller and denser as the doping increase. © 2011 American Institute of Physics.

Abd Patah N.D.H.B.,ElecTronic Center | Herman S.H.B.,ElecTronic Center | Herman S.H.B.,Frontier Engineering
2nd International Symposium on Technology Management and Emerging Technologies, ISTMET 2015 - Proceeding | Year: 2015

Zinc oxide (ZnO) thin films were deposited on indium tin oxide (ITO) substrates by spin coating method to be applied as sensing membrane of an extended gate field effect transistor (EGFET) glucose sensor. This paper focused on the effect of film thickness to the glucose sensing characteristics. The surface morphology of the thin films were characterized using Field Emission Scanning Electron Microscopy (FESEM). FESEM images revealed that the thin films became denser and the grain size increasing proportional with the thickness while the sensing properties measured by Extended-gate Field Effect Transistor (EGFET) measurement setup indicated that the sensitivity decreased as the thickness increased. From the I-V measurement, we found that the conductivity increased with the increasing thickness. Based on the results, we propose that there is a relation between the conductivity and the sensor sensitivity. © 2015 IEEE.

Radzi A.A.S.M.,University Technology of MARA | Yarmo M.A.,National University of Malaysia | Rusop M.,University Technology of MARA | Rusop M.,ElecTronic Center | Abdullah S.,University Technology of MARA
Advanced Materials Research | Year: 2013

Multilayer structure of porous silicon was fabricated using electrochemical etching method. Average thickness of multilayer structure was verified. Surface morphology from Atomic Force Microscopy (AFM) shows that surface roughness was decreased when higher etching time applied to the samples. Si 2p binding energies were corresponded to the composition of void within the silicon which prompted the formation of porous silicon nanostructure. Depth profiling technique from X-Ray photoelectron spectroscopy (XPS) was used for compositional determination of porous silicon layers since samples' porosity varied according to current density applied during the electrochemical etching process. Multilayer porous silicon is a high potential candidate for Bragg grating waveguide device. © (2013) Trans Tech Publications, Switzerland.

Norlina M.S.,University Technology of MARA | Mazidah P.,University Technology of MARA | Sin N.D.Md.,ElecTronic Center | Rusop M.,ElecTronic Center
2015 7th Computer Science and Electronic Engineering Conference, CEEC 2015 - Conference Proceedings | Year: 2015

This paper is focusing on the RF magnetron sputtering process; a physical vapor deposition technique which is widely used in the thin film production. This process requires the optimized combination of deposition parameters in order to obtain the desirable thin film. This research is proposing gravitational search algorithm (GSA) technique in solving the RF magnetron sputtering deposition parameters optimization problem. In this research, the optimized parameter combination is expected to produce the desirable electrical and optical properties of the thin film. The performance of GSA in this research was compared with that of PSO and GA. Based on the overall result, the thin film that has been deposited based on GSA optimized parameter combination has generated the best electrical and optical properties results among others. This computational experiment is expected to overcome the problem of having to conduct repetitive laboratory experiments in order to obtain the most optimized parameter combination. Thus, the adaptation of computational intelligence into this problem could offer a more efficient and productive way of depositing quality thin film. © 2015 IEEE.

Norlina M.S.,University Technology of MARA | Mazidah P.,University Technology of MARA | Md Sin N.D.,ElecTronic Center | Rusop M.,ElecTronic Center
2014 IEEE Student Conference on Research and Development, SCOReD 2014 | Year: 2014

Computational intelligence has been widely adapted in various fields and has been demonstrated excellent performances in solving optimization problems. This study is proposing the implementation of gravitational search algorithm (GSA) in the parameter optimization of RF magnetron sputtering process. RF magnetron sputtering is a nanotechnology process which involves the deposition of nano-scaled atoms of a target material. The current practice of searching for the optimized parameters in the magnetron sputtering process is based on the trial and error method. However, this conventional method has been reported to be time consuming and costly. GSA is proposed to identify the most optimized parameter combination for producing the desirable zinc oxide (ZnO) thin film electrical property. GSA is a population based algorithm which is based on the Newton's law of gravity and the law of motion. This study is concentrating on three magnetron sputtering process parameters, which are RF power, oxygen flow rate and substrate temperature. These three process parameters are among the sputtering process parameters that have been extensively studied by the researchers for the fabrication of the nanostructured ZnO thin film. The result from GSA optimization had showed that the algorithm performance was acceptable in optimizing the parameter combination from the set of parameters. Based on the GSA acceptable performance, it is expected that this technique could serve as an improvement from the traditional practice in the fabrication process. © 2014 IEEE.

Norlina M.S.,University Technology of MARA | Mazidah P.,University Technology of MARA | Sin N.D.M.,ElecTronic Center | Rusop M.,ElecTronic Center
2015 IEEE Congress on Evolutionary Computation, CEC 2015 - Proceedings | Year: 2015

This paper presents the adaptation of Genetic Algorithm (GA), Particle Swarm Optimization (PSO) and Gravitational Search Algorithm (GSA) in solving a nano-process parameter optimization problem. The nano-process in this study is involving the RF magnetron sputtering process. The performances of the algorithms are compared in this optimization problem. The performance of GA, PSO and GSA is evaluated based on the fitness of the optimized parameter combination, processing times and the results from comparison with the actual laboratory experiments. The purpose of this computational experiment is to obtain the most optimized parameter combination among the selected datasets. The source material used in this study is zinc oxide (ZnO) and the most optimized combination of the process parameters is expected to produce the desirable nanostructured ZnO thin film's electrical properties. The results have shown that GA could perform better than PSO and GSA by generating higher fitness values in 30 trial runs. However, GA has obtained the slowest execution time among the three algorithms. In this study, GSA has also produced an acceptable and promising result with faster execution time. When compared with the actual laboratory experiment, GA and GSA have generated more accurate optimization results. In terms of convergence of the algorithms, GA and GSA have shown more stable convergence compared to PSO. This study has shown that metaheuristic techniques are promising and reliable to be applied in solving this process parameter optimization problem. © 2015 IEEE.

Shaari N.A.A.,Electronic Center | Kasim S.M.M.,Electronic Center | Sauki N.S.M.,Electronic Center | Herman S.H.,Electronic Center
IOP Conference Series: Materials Science and Engineering | Year: 2015

This paper presents the memristive behavior of zinc oxide thin films deposited on ITO substrate by sol-gel spin coating technique. The spin coating speed was varied from 1000 rpm to 5000 rpm to study the effect it has on the memristive device fabricated. The electrical properties were characterized by using a two-point probe IV (current-voltage) measurement system (Keithley 2400). The thicknesses of the thin films were measured by Veeco Dektak 150 Surface Profiler and it shows that the thickness decreased with the spin coat speed. The lowest thickness was obtained from thin film deposited at 5000 rpm which is 17.47 nm. The highest resistance Roff/Ron ratio was obtained from thin film spin coated at 3000 rpm which is 1.346 with visible ZnO nanoparticle characterized by FESEM (JEOL JSM 6701F). This indicated that the optimum spin coat speed for the zinc oxide-based memristive device is 3000 rpm as it exhibited the best switching behavior. © Published under licence by IOP Publishing Ltd.

Fadzilah A.N.,ElecTronic Center | Rusop M.,University Technology of MARA
International Conference on Electronic Devices, Systems, and Applications | Year: 2011

The work presented here shows the effect of deposition temperature on amorphous carbon (a-C) thin films. The a-C thin film were deposited on glass substrate by pyrolysing camphor oil at various temperature using the Chemical Vapor Deposition (CVD) technique. The films were prepared at various deposition temperature ranging from 350°C to 500°C. The electrical, optical and structural properties were characterized by current-voltage (I-V) Measurement, UV-VIS-NIR Spectrophotometer and Atomic Force Microscopy (AFM) respectively. As the deposition temperature increase, the conductivity increased but the optical band gap decrease from 1.5eV to 0.5eV due to the formation of more sp 2 bonded carbon configuration. © 2011 IEEE.

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