Abd Khamim Ismail

Abd Khamim Ismail
Universiti Teknologi Malaysia | UTM · Department of Physics

PhD. Univ. of Newcastle. UK

About

72
Publications
18,509
Reads
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227
Citations
Introduction
- Sensors - Nano-structures - Micro-electromechanical system (MEMS) - Instrumentation and measurement - Micro-nano voltammetric electrode fabrication
Additional affiliations
January 2008 - present
Universiti Teknologi Malaysia
September 2002 - June 2006
Newcastle University

Publications

Publications (72)
Article
Silicon nanonowires (SiNWs) were synthesized with approximately 100 nm/min by very-high-frequency plasma-enhanced chemical vapor deposition method via a vapor-liquid-solid mechanism. Pure silane gas was deposited on Au-coated silicon substrates at various radio frequency (RF) powers varied from 5 to 20 W, keeping other deposition parameters constan...
Article
This paper presents a discussion on the fabrication, characterization and testing of a degenerate mode resonant mass sensor which takes the form of a crystalline silicon MEMS circular diaphragm. The device is fabricated from the device layer of a SOI wafer which is bonded anodically to a Pyrex substrate. The efficacy of the fabrication process is a...
Article
The paper presents the design principles of a degenerate mode resonant mass sensor in which the unloaded sensor takes the form of a cyclically symmetric structure. The simplest structure with these features is a circular diaphragm and its properties are exploited in this paper. Such structures support pairs of independent modes of vibration which s...
Article
The characteristics of sputtered amorphous diamond-like carbon-containing copper (DLC: Cu films) films deposited on Si (100) substrates and Si (111) in argon gas-filled chamber using carbon target under different substrates deposition time, and RF power. The samples were deposited by RF magnetron sputtering and analyzed using Raman spectroscopy and...
Article
Full-text available
AbstrakPenentuan ketulenan jongkong emas dengan kaedah ujian tanpa musnah adalah perkara yang paling mencabar dalam industri emas terutama jika jongkong emas dipalsukan dengan cara meletakkan tungsten di dalamnya. Instrumen yang sedia ada mempunyai keterbatasan untuk menentukan ketulenan jongkong emas dan sukar untuk mengesan tungsten di dalamnya k...
Article
Full-text available
Graphene has become a remarkable highlight of advanced material research because of its far superior properties compared to other materials. Chemical vapor deposition (CVD) has emerged as an essential method for scalable production and large area graphene for various applications. Various carbon precursors have been reported for graphene production...
Article
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Determination of gold bar purity remains one of the most challenging tasks in gold industry. Currently, the existing instruments have a limitation to determine the purity, which in turn have produced inaccurate gold purity measurement. For example, X-ray fluorescence (XRF) technique has a limitation to penetrate the gold bar and XRF was only used t...
Article
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The impact of graphene and poly(methyl methacrylate) (PMMA) substrates on the response of a fiber Bragg grating (FBG) due to mechanical deflection was investigated. For this purpose, four FBGs with grating lengths of 5, 15, 25, and 35.9 mm were utilized. Higher sensitivity was found for FBGs of larger grating length and for those bonded to graphene...
Article
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Volume thermal expansion measurement of the solid is one of the most challenging issue in material industry especially when the solid is in big size. The existing instruments such as dilatometer has a limitation to determine the volume thermal expansion of material. Therefore, a new and precise system has been proposed to determine the volume therm...
Article
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In this study, the response of a FBG-bonded-graphene plate at different applied stress location is demonstrated. The sensing element utilized for this purpose is a 35.9-mm FBG sensor bonded onto the surface of a graphene plate. The lateral displacement is changed with corresponding increase or decrease in the FBG's curvature. The change in center w...
Article
ntroduction: Brain visual evoked potential (VEP) signals are commonly known to be accompanied by high level of background noise typically from the spontaneous background brain activity of Electroencephalography (EEG) signals. Materials & Methods: A model based on dyadic filter bank discrete wavelet transformation (DWT) and singular value decomposit...
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A 150 MHz very high frequency plasma enhanced chemical vapor deposition (150 MHz VHF-PECVD) system was utilized to fabricate two-dimensional carbon nanostructure from the mixture of methane and hydrogen. Morphology and structural properties of the grown nanostructure were investigated by FESEM imaging and Raman spectroscopy. Carbon nanowalls (CNW)...
Article
Perceptual decision making is one of the most complex brain perception forming multi network information interactions in the brain. The accuracy of decision making varies with age and maturity level. We have used electroencephalogram time locked with Rorschach inkblot figures for temporal investigation of decision related components in different ag...
Article
Two-phase micro-electrodriven membrane extraction (EME) procedure for the pre-concentration of selected non-steroidal anti-inflammatory drugs (NSAIDs) in aquatic matrices was investigated. Agarose film was used as interface between donor and acceptor phase in EME which allowed for selective extraction of the analytes prior to high performance liqui...
Article
Bulk silicon carbide (SiC) as light emitter is less efficient due to its indirect bandgap. Therefore, nanosized SiC thin film fabrication approach enable emission wavelength shifts due to spatial confinement. The result of luminescent study of SiC thin film deposited via very high frequency plasma-enhanced chemical vapour deposition (VHF-PECVD) are...
Article
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Problem solving is an important aspect in learning Physics. Looking at the internal and external assessments, it shows that our students are still facing difficulty regarding this aspect. Therefore, several studies focusing on cognitive factors such as improving teaching methods have been done. However, it is found that motivation is a vital factor...
Article
The aim of this study was to investigate and apply supported ionic liquid membrane (SILM) in two-phase micro-electrodriven membrane extraction combined with high performance liquid chromatography-ultraviolet detection (HPLC-UV) for pre-concentration and determination of three selected antidepressant drugs in water samples. A thin agarose film impre...
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Problem solving is a critical element in learning science and mathematics especially in Physics. However, based on the results from a few of assessments, it showed the situation is worrying. Recently, many studies that have been done were focusing on how to teach problem solving. However, it is found that social support from parents can also influe...
Article
The viability of Au thin film systems is decided by the growth parameters related diffusion mechanism where the gold layers can be made extremely thin without sacrificing their reliability. Controlling the characteristics of this process for Au over the various one- and two-layer base metal systems is challenging. Furthermore, Au acts as an importa...
Conference Paper
ZnO nanowires have been grown on pre-coated (ZnO thin film) silicon (100) substrates with special attention on the effect of gas flow rate. The samples were fabricated using a simple thermal evaporation method within a horizontal quartz tube under controlled supply of Ar and O2 gas where ZnO powder source were previously weighed and heated at 960 °...
Article
Fiber Bragg Grating sensing (FBG) has been intensively studied in the application of smart structures because of its immense advantages offered over those of the conventional sensors. In these researches unique characteristics of FBG, like its high sensitive resonance frequency spectrum and its resonant behavior were reported when FBG was coated by...
Article
In this study, the response of a FBG-bonded-graphene plate at different applied stress location is demonstrated. The sensing element utilized for this purpose is a 35.9-mm FBG sensor bonded onto the surface of a graphene plate. The lateral displacement is changed with corresponding increase or decrease in the FBG’s curvature. The change in center w...
Conference Paper
Full-text available
Self-assembled In0.5Ga0.5As quantum dots(QDs) were grown on various thickness of GaAs multi-atomic steps layer using Stranski-Kratanov (SK) growth mode. Atomic force microscopy(AFM) analysis indicates fluctuation of size and density of the dots. The varieties of dots formed on the surface are believed to be the affect of different structure of GaAs...
Article
Achieving two dimensional quantum structure of silicon with well-defined tunable morphology is an outstanding issue. We present the preliminary results on fabrication parameters dependent silicon thin film production using VHF-PECVD method. Five samples are prepared on Si(100) substrate with gold (Au) catalyst by adjusting different parameters such...
Article
An effective ferricyanide-mediated microbial biochemical oxygen demand (BOD) biosensor was constructed and used for BOD determination in a water system. This BOD sensor uses ultramicroelectrode (UME) technology in which the tip of the sensor consists of a two-electrode system (10- mm Pt working electrode and Pt counter electrode). Because of their...
Article
Full-text available
Achieving two dimensional quantum structure of silicon with well-defined tunable morphology is an outstanding issue. We present the preliminary results on fabrication parameters dependent silicon thin film production using VHF-PECVD method. Five samples are prepared on Si(100) substrate with gold (Au) catalyst by adjusting different parameters such...
Article
In this work, thermoluminescence (TL) characteristics of powder form of polycrystalline aluminium oxide doped with 0.2 atomic percentage (at%) carbon (Al2O3:C 0.2 at%) and co-doped with two different concentrations of titanium (0.1 and 0.2 at%) subjected to X-ray irradiations were studied. This study was conducted to determine the capability of Al2...
Article
Full-text available
Carbon doped aluminum oxide co-doped with magnesium (Al2O3:C:Mg) thin films were deposited using radio frequency magnetron sputtering method on Si (100) substrates. The deposition chamber temperature was manipulated to allow control over the crystalline phase. The crystalline phase of deposited thin films were determined by x-ray diffraction (XRD)...
Conference Paper
Full-text available
Measure Projection Analysis (MPA) method based on EEGLAB and Matlab Toolbox is used to analyze the projections of brain signal sources that are responsible for the measured potentials at the scalp electrodes. These projections are based on probabilistic multi subject algorithm abandoning the notion of distinct independent component clusters. It exa...
Conference Paper
The growth and characterization of nanostructured zinc antimonides thin films are reported in this work. The nanostructured zinc antimonides thin films were prepared by RF magnetron sputtering using a single sputtering target. The range of growth parameters was determined for substrate temperature (50°C–150°C), deposition time (600 s), argon flow r...
Conference Paper
Full-text available
In-situ Optical Emission Spectroscopy was used as diagnostics tool to monitor deposition process of Silicon Carbide (SiC) film using Very High Frequency - Plasma Enhanced Chemical Vapor Deposition (VHF-PECVD) method. The VHF-PECVD operated at plasma excitation frequency of 150MHz and 25 W of RF power was applied to generate plasma. A mixture of sil...
Article
Full-text available
Perceptual decision making depends on the choices available for the presented task. Most event-related potential (ERP) experiments are designed with two options, such as YES or NO. In some cases, however, subjects may become confused about the presented task in such a way that they cannot provide a behavioral response. This study aims to put subjec...
Article
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This study presents an analysis on Visual Evoked Potentials (VEPs) recorded mainly from the occipital area of the brain. Accumulation of segmented windows (time locked averaging), Coiflet wavelet decomposition with dyadic filter bank and Principle Component Analysis (PCA) of three stages were utilized in order to decompose the recorded VEPs signal,...
Article
Full-text available
Agarose film micro-electrodriven membrane extraction (AF-µ-EME) combined with liquid chromatography as a new microextractiontechnique was developed and applied for extraction of three selected anti-depressant drugs from tap water and human urine samples.Using 2-nitrophenyl octyl ether, NPOE as organic liquid membrane immobilized in the pores of a p...
Article
Full-text available
Cross Coherence time frequency transform and independent component analysis (ICA) method were used to analyse the electroencephalogram (EEG) signals in resting and action states during open and close eyes conditions. From the topographical scalp distributions of delta, theta, alpha, and beta power spectrum can clearly discriminate between the signa...
Article
A two-phase low-voltage electrodriven membrane extraction (EME) method combined with high performance liquid chromatography (HPLC) was developed for the determination of tricyclic antidepressants (TCAs) in aqueous matrices. Three TCAs, namely imipramine (IMI), amitriptyline (AMI) and chlorpromazine (CHLO) were used as target analytes. The drugs wer...
Article
Full-text available
The single layer In0.5Ga0.5As quantum dots (QDs) were grown on a thin InxGa1-xAs underlying layer by metal-organic chemical vapor deposition(MOCVD) via Stranski-Krastanow growth mode. The effect of different indium composition in the InxGa1-xAs underlying layer was investigated usingatomic force microscopy (AFM). AFM images show that the QDs struct...
Article
Full-text available
Biochemical Oxygen demand (BOD) is an important parameter indicating the total biodegradable organic pollutants in waters. Fast BOD determination could be achieved using BOD biosensor. However, most of the developed BOD biosensors are dependent on dissolved oxygen concentrations. Low solubility of oxygen in water decreases the reliability of oxygen...
Article
Full-text available
The growth of Al:ZnO nanorods on a silicon substrate using a low-temperature thermal evaporation method is reported. The samples were fabricated within a horizontal quartz tube under controlled supply of O2 gas where Zn and Al powders were previously mixed and heated at 700°C. This allows the reactant vapors to deposit onto the substrate placed ver...
Article
This paper describes an improved hydrometer calibration method using a ring type sinker as a reference standard mass. This calibration method can be used for any surface tension and reference temperature design of hydrometer. A suitable dimension of standard ring was used to sink hydrometers into distilled water. The distilled water was used as sta...
Article
Stacked self-assembled In0.5Ga0.5As/GaAs quantum dots (QDs) were grown using metal organic chemical vapor deposition (MOCVD). Atomic force microscopy (AFM), transmission electron microscopy (TEM) and high resolution X-ray diffraction (HR-XDR) show the effects of stacking on morphology and structure of QDs. Strains due to the buried QDs affect the s...
Conference Paper
Full-text available
EEG source localization was studied in order to determine the location of the brain sources that are responsible for the measured potentials at the scalp electrodes using EEGLAB with Independent Component Analysis (ICA) algorithm. Neuron source locations are responsible in generating current dipoles in different states of brain through the measured...
Conference Paper
Optical emission spectroscopy (OES) is applied to monitor the plasma behaviour during the deposition process of silicon carbide films in a very high frequency plasma enhanced chemical vapour deposition. The OES intensities for molecular radicals such as SiH*, CH* and atomic hydrogen lines were monitored throughout the process. By varying the discha...
Article
Thermoluminescent dosimeter (TLD) of carbon–doped aluminium oxide (α–Al 2 O 3 :C) produced in the form of single crystals show high sensitivity to ionizing radiation (about 40–60 times higher than TLD–100 (LiF:Mg,Ti)). The present article offers a review of the materials preparation and corresponding thermoluminescence (TL) properties of α–Al 2 O 3...
Article
The development of a rapid sensor for Biochemical Oxygen Demand (BOD) is important for rapid determination of the degree of pollution in river water. A short–term BOD (BOD st) has been developed using a consortium of locally isolated bacteria as the sensing element. YSI 52 Dissolved Oxygen Meter has been used to measure the oxygen uptake in the tes...
Article
Full-text available
We have performed atomic force microscopy to investigate the effect of various indium compositions and various AsH3 flow times during cooling on the formation of self-assembled InxGa1 xAs quantum dots (QDs). The InxGa1 xAs QDs were grown by metal-organic chemical vapour deposition using the Stranski-Krastanow (S-K) growth mode. The migration of gro...
Article
In the present work the performance of orthogonal and Biorthogonal wavelet filters were analyzed for visual evoked potentials (VEP) on a variety of noisy signals. The signals were analyzed at different signal to noise ratio (SNR). This research proposed a method for the selection of the best analysis. The proposed method used longest common subsequ...
Article
Full-text available
SiC thin film has been synthesized by using conventional 13.56MHz radio frequency plasma enhanced chemical vapour deposition (PECVD). The mixture of silane (SiH4) and methane (CH4) were used as precursor gases while hydrogen as carrier gas. The SiH4/CH4 ratio and the substrate temperature have been varied in order to examine the reaction of the act...
Article
Full-text available
Self-assembled In0.5Ga0.5As quantum dots (QDs) were grown using metal-organic chemical vapor deposition (MOCVD) on GaAs (100) substrate with different number of stacking QDs layers. Surface study using atomic force microscopy (AFM) shows that surface morphology of the self-assembled QDs change with different number of stacking QDs layers caused by...
Article
The interdependence parameters in the growth of silicon self-assembled nanodots are investigated. Accordingly, the critical radius, critical energy change and surface energy can be interpreted in terms of cubic function, where it produced a critical surface energy NS* and the corresponding r* and G*, called a CRESE point at a fixed growth tempera...
Conference Paper
Visual evoked potential (VEPs) is an electrical potential recorded from the nervous system of a human brain following presentation of a visual stimulus; differ than spontaneous potentials as detected by electroencephalography (EEG). Visual evoked potentials (VEPs) is very weak and sensitive signals implemented in the wideband ongoing electroencepha...
Conference Paper
Full-text available
This paper proposes a novel method for selection of optimal wavelet decomposition of visual evoked potentials (VEP) by using different types of wavelet transformation. Since the choice of the mother wavelet substantially impact the performance for diagnosis purpose. An effective method for selecting the optimal mother wavelet for decomposition of V...
Article
Full-text available
Ring method offers simple yet effective hydrometer calibration method with comparable performance to other hydrometer calibration methods. This work reports a ring method experimental setup for calibrating hydrometers. It uses a suitable dimension of ring to sink hydrometers in standard liquid which traceable to solid density determined by hydrosta...
Article
Full-text available
The effect of a thin In0.1Ga0.9As underlying layer on the structural properties of single layer In0.5Ga0.5As quantum dots (QDs) was investigated using atomic force microscopy (AFM), transmission electron microscopy (TEM) and high-resolution X-ray diffraction (HR-XRD) characterization. The size of dots formed on the surface is uniform but the densit...
Article
In this research, gold catalyzed silicon nanowires (SiNWs) were synthesized on a Si(111) substrate using very high frequency plasma enhanced chemical vapor deposition method based on a vapor-liquid-solid growth mechanism at various growth durations. The results showed that the obtained SiNWs were needle-like shape, which differs from the standard c...
Article
Silicon nanonowires (SiNWs) were synthesized with approximately 100 nm/min by very-high-frequency plasma-enhanced chemical vapor deposition method via a vapor–liquid–solid mechanism. Pure silane gas was deposited on Au-coated silicon substrates at various radio frequency (RF) powers varied from 5 to 20 W, keeping other deposition parameters constan...
Article
Silicon nanowires (SiNWs) were synthesized from pure silane precursor gas and Au nanoparticles catalyst at below Au-Si eutectic temperature. The SiNWs were grown onto Si (1 1 1) substrates using very high frequency plasma enhanced chemical vapor deposition via a vapor-solid-solid mechanism at temperatures ranging from 363 to 230 °C. The morphology...
Article
Silicon quantum dots have been grown on sapphire substrate using a self-assembly method of physical vapour deposition. The samples were fabricated at low sputtering rate and varying experimental conditions. Apparently, the onset of nucleation took place during the first 5 minutes of deposition, followed by a further growth of stable islands so-call...
Conference Paper
Silicon quantum dots have been grown on sapphire substrate using a self-assembly method of physical vapour deposition. The samples were fabricated at low sputtering rate and varying experimental conditions. Apparently, the onset of nucleation took place during the first 5 minutes of deposition, followed by a further growth of stable island nanodots...
Article
Full-text available
In this research an atomic force microscopy (AFM) study on self-assembled In0.5Ga0.5As/GaAs quantum dots (QDs) was performed. Surface morphology of self-assembled In0.5Ga0.5As QDs changes with different growth time. Increasing growth time increased the dots size and decreased the dots density. In addiditon, self-assembled In 0.5Ga0.5As QDs was grow...
Article
Uncapped double stacked Ino.5Gao.5As quantum dots (ODs) with different spacer layer thicknesses were grown using metal-organic chemical vapour deposition (MOCVD). The precursors used for the growth of the GaAs layer and Ino.5Gao.5As ODs were trimethylgallium (TMGa), trimethylindium (TMln), and arsine (AsH3). The morphology and optical properties of...
Article
Full-text available
Single layer of In0.5Ga0.5As quantum dots (QDs) was grown using self-assembled Stranski-Krastanow on a thin InxGa1−xAs underlying layer and on a reference GaAs wafer by metal-organic chemical vapour deposition (MOCVD). The effect of different indium composition in the underlying layer and the duration of arsine (AsH3) flow during cooling-down perio...
Article
Full-text available
The single layer In0.5Ga0.5As quantum dots (QDs) were grown on a thin InxGa1−xAs underlying layer by metal-organic chemical vapour deposition (MOCVD) via Stranski-Krastanow growth mode. The effect of different indium composition in the In − xGa1−xAs underlying layer was investigated using atomic force microscopy (AFM). AFM images show that the QDs...
Article
Full-text available
In0.5Ga0.5As quantum dots (QDs) stacked structure were studied using atomic force microscopy (AFM), high-resolution X-ray diffraction (HR-XRD) and photoluminescence (PL) characterization. Evolution in the dots size and dots density in the stacked structures is strongly influenced by the dot formation in the under-layer and the structure of the spac...
Article
Stacked structures of self-assembled In0.5Ga0.5As/GaAs quantum dots (QDs) have been grown using Metal-Organic Chemical Vapor Deposition (MOCVD) with different number of stacks. High Resolution X-Ray Diffraction (HR-XRD) and Transmission Electron Microscope (TEM) characterization revealed that the formation of stacked self-assembled In0.5Ga0.5As QDs...
Article
Single and double layer In0.5Ga0.5As/GaAs QDs with various buffer layer thickness were grown by metal-organic chemical vapor deposition (MOCVD) using Stranski-Krastanow growth mode. The effect of buffer layer thickness on a high density QDs has been investigated using atomic force microscopy (AFM). Surface morphology which includes variation in the...
Article
Full-text available
Stacked InxGa1-xAs quantum dots (QDs) were grown by metal-organic chemical vapor deposition (MOCVD) via Stranski -Krastanov growth mode. AFM images show that the QDs structures were formed and the stacked structure of InxGa1-xAs QDs were confirmed by the HR-XRD analysis. Composition of the dots on the top most layers was related to the number of st...
Conference Paper
The present work reports a simple, rapid and versatile strategy for glycoprotein immobilization, based on the targeted functionalization of carbohydrate residues with disulphide "anchors" derivatives able to spontaneously chemisorb onto gold, with no need of surface pre-functionalization. Different glycoproteins as enzymes and antibodies were chemi...
Article
Micro-Electro-Mechanical Systems (MEMS) based mass sensors have been widely used in many biochemical applications. The principle of the resonant mass sensor for detecting small amounts of added surface mass is based on the measurement of an absolute frequency shift in the resonant frequency of a mechanical structure. Since these sensors rely on the...

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