Karsono Ahmad Dasuki - Academia.edu (original) (raw)

Papers by Karsono Ahmad Dasuki

The Method of Lines (MOL) has been one of the simplest but effective technique for solving partia... more The Method of Lines (MOL) has been one of the simplest but effective technique for solving partial differential equations (PDEs) in which all but one dimension is discretized. This work describes numerical solution of 1-dimensional Schrodinger equation using the method of lines approach (MOL) where spatial dimensions were discretized using some finite difference approximation leaving the time dimension to be the only independent variable in the resulting system of initial value problems. The effect of changing the discretization size on the accuracy of the solution procedure versus changing the step size in the integration of the resulting differential equation was also studied with the incorporation of Simpson’s rule function in MATLAB.

Solid State Phenomena, 2017

The ray tracing of unclad U-shape multimode fiber optic is examined by using Zemax simulation hav... more The ray tracing of unclad U-shape multimode fiber optic is examined by using Zemax simulation have been proposed. The influence of the geometry of sensing region such as absorbing medium refractive index, n2, shape of fiber and the bending radius is analyzed. Number of analysis ray is determined and the value of n2 is varied at 1, 1.3314, 1.359, 1.36, 1.37 and 1.4. The intensity of light propagate inside the fiber is reducing at high n2 and this graph pattern is supported by experimental result. A U-shaped sensor is used for the analysis because of the sensitivity is higher than straight fiber design due to their higher penetration depth. Zemax simulation shows that the fiber with bending radius 1.5 mm has higher response compared to fiber with radius 2.5 mm.

The demand of energy, global warming and greenhouse gas emission have forced the world to look in... more The demand of energy, global warming and greenhouse gas emission have forced the world to look into alternative sources of energy. Solar thermal technologies are regarded as the most promising technology that can supplement the usage of fossil fuels in power generation. Among the solar thermal technologies, parabolic trough solar collectors (PTC’s) from the concentrated solar power (CSP) technology are the most matured application for the production of electricity and steam generation. The development of parabolic trough solar collectors has been carried out throughout the world for different thermal applications ranging from industrial heat process to generation of electricity. In Malaysia, the use of solar thermal technology for the generation of electricity and industrial heat process is not given much attention. Therefore, the objective of this paper is to review the development of parabolic trough solar collectors (PTC’s) for different thermal applications and pointing out some...

2018 IEEE International Conference on Semiconductor Electronics (ICSE), 2018

This study discussed the effect of nanocomposite film's thicknesses on the generation of SPR ... more This study discussed the effect of nanocomposite film's thicknesses on the generation of SPR for detection of Pb²+ ions. Ag-GO nanocomposite film was deposited on the hypothenuse side of the triangular prism via Kretschmann configuration. The thicknesses of Ag-GO were varied between 50nm and 60nm by manipulating the Ag's thicknesses from 30nm to 50nm and GO's between 2nm and 10nm. The optimum SPR signal was obtained as thickness of Au-GO was fixed at 50nm with tAg=48nm and t<inf>GO</inf>=2nm resulting 75.77% of SPP excitation. As thicknesses of GO increased above 2nm and thicknesses of Ag were set less or more than 48nm, the SPP excitation became weaker. The sensitivity of SPR sensor shows a good agreement with the generation of SPP. The sensor exhibits the optimum sensitivity of s=0.452°/RIU with angle shifting of 0.905°as nanocomposite film under configuration of tAg=48nm: t<inf>GO</inf>=2nm and tAg=50nm: t<inf>GO</inf>=2nm were employed. In conclusion, the amplification of SPR sensor's sensitivity can be achieved by introducing 50nm nanocomposite films consist of ±2nm thicknesses of GO.

EPJ Web of Conferences, 2017

Gold nanoparticles (GNPs) have been known as an excellent characteristic for Local Surface Plasmo... more Gold nanoparticles (GNPs) have been known as an excellent characteristic for Local Surface Plasmon Resonance (LSPR) sensors due to their sensitive spectral response to the local environment of the nanoparticle surface and ease of monitoring the light signal due to their strong scattering or absorption. Prior the technologies, GNPs based LSPR has been commercialized and have become a central tool for characterizing and quantifying in various field. In this review, we presented a brief introduction on the history of surface plasmon, the theory behind the surface plasmon resonance (SPR) and the principles of LSPR. We also reported on the synthetization as well of the properties of the GNPs and the applications in current LSPR sensors.

EPJ Web of Conferences, 2017

Polymer optical fibers (POFs) have significant advantages over numerous sensing applications. The... more Polymer optical fibers (POFs) have significant advantages over numerous sensing applications. The key element in developing sensor is by removing the cladding of the fiber. The use of organic solvent is one of the methods to create tapered POF in order to expose the core region. In this study, the etching chemicals involved is acetone, methyl isobutyl ketone (MIBK), and acetone-methanol mixture. The POF is immersed in 100%, 80%, and 50% of acetone and MIBK dilution. In addition, the mixture of acetone and methanol is also used for POF etching by the ratio 2:1 of the volume. Acetone has shown to be the most reactive solvent towards POF due to its fastest etching rate compared to MIBK and acetone-methanol mixture. The POF is immersed and lifted from the solution for a specific time, depending on the power loss properties for the purpose of producing unclad POF. In comparison to silica fiber optic, the advantages of POF in terms of its simple technique and easy handling enable it to produce unclad POF without damaging the core region. The surface roughness of the POF is investigated under the microscope after being immersed into different solvent. This method of chemical tapering of POF can be used as the fundamental technique for sensor development. Next, the unclad fiber is immersed into ethanol solutions in order to determine the reaction of unclad POF towards its surrounding. The findings show that this particular sensor is sensitive towards concentration changes ranging between 10 wt% to 50 wt%.

EPJ Web of Conferences, 2017

Optical sensor based on surface plasmon resonance are widely used for various applications. In th... more Optical sensor based on surface plasmon resonance are widely used for various applications. In this paper, an optimization of EM waves polarization modes for the occurrence of SPR by using a modified optical waveguiding assembly has been discussed. A 633 nm of linearly polarized He-Ne laser was appointed as a light source. The polarization modes were controlled by rotating the position of He-Ne laser. It was found that the optimum SPR signal with reflectance, R = 0.21 a.u and SPR angle, θSPR = 48° can be obtained as the position of laser was rotated at 90°, with the presence of polarizer. The location of the critical angle was observed at θC = 46°. For the validation purpose, a simulation based on Fresnel equation was conducted where the percentage difference between the experimental and theoretical results were analyzed. The percentage difference between experimental and theoretical results for both θSPR and θC were 9.09% and 15.00% respectively. In conclusion, an excellent agreement between the theoretical and experimental findings proved the stability of this SPR setup, where the EM waves polarization can easily be controlled by manipulating the position of laser.

AIP Conference Proceedings, 2018

Design and analysis of a spectro-angular surface plasmon resonance biosensor operating in the vis... more Design and analysis of a spectro-angular surface plasmon resonance biosensor operating in the visible spectrum Review of Scientific Instruments 85, 093107 (2014);

Journal of Physics: Conference Series, 2019

Undoped and Al-doped ZnO thin films have been prepared by the sol gel method. Zinc acetate dihydr... more Undoped and Al-doped ZnO thin films have been prepared by the sol gel method. Zinc acetate dihydrate, ethanol and monoethanolamine were used as precursor, solvent and stabilizer, respectively. In the case of molarity study for Al-doped ZnO, aluminum nitrate nonahydrate was added to the precursor solution from 0 at. % to 6 at. % at molarity of 0.1 M, 0.2 M and 0.3 M. The optical properties were characterized using UV-Vis where the band gap of undoped ZnO increases as the annealing temperature increase and the band gap decrease as the molarity increment. Meanwhile the band gap increase upon increment of Al dopant under molarity of 0.1 M and 0.2 M due to Burstein-moss effects. Meanwhile at 0.3 M, the bandgap increase until 4 at. % of Al and suddenly decrease abruptly at 6 at. % of Al. The effect of molarity and dopant percentage on the thin film gives a different value of energy band gap.

Malaysian Journal of Fundamental and Applied Sciences, 2017

Water contamination by heavy metals is a common issue encountered in many countries due to indust... more Water contamination by heavy metals is a common issue encountered in many countries due to industrial and urban wastes in water resources which give health and socio-economic impacts. This work is carried out to investigate the effect of EM wave polarization modes on the sensing properties of surface plasmon resonance (SPR) sensor in detecting heavy metal ions namely mercury (Hg) and plumbum (Pb). Three types of polarization modes such as p-polarized, s-polarized and circular-polarized light were introduced. Gold and silver thin films with thicknesses of 50nm were deposited on top of SPR layer system to excite surface plasmon polaritons (SPPs). The SPR curves were analyzed by studying the FWHM, Q-factor and angle shifting characteristics. We manage to prove theoretically that the SPR phenomena able to be created by using not only the p-polarized light, yet by employing a circular-polarized light. The sensor shows positive respond for both polarization modes, where the troughs were r...

2016 IEEE International Conference on Semiconductor Electronics (ICSE), 2016

Nowadays, surface plasmon resonance (SPR) sensor has been widely used in biosensing applications ... more Nowadays, surface plasmon resonance (SPR) sensor has been widely used in biosensing applications to detect the wide diversity of biomolecular interactions. There are few parameters need to be concerned in order to optimize the performance of SPR sensors such as film thicknesses, type of thin films and their configurations. In this study, we seek to determine the optimum thicknesses of hybrid thin films which consist of gold-graphene oxide layers for the enhancement of SPR sensor sensitivity. By using a theoretical approach, a WINSPALL 3.02 simulator had been used to investigate the effects of various thicknesses of hybrid configuration's thin films towards the excitation of surface plasmon polaritons (SPP). A layer of 3 nm protein was added to compare the maximum adsorption of the SPR sensor based on their configuration. It was found that the optimum thicknesses of gold and graphene oxide are 50 nm and 0.68 nm respectively for achieving best sensitivity. Thus, the sensitivity value for gold-GO thin films is higher than silver-GO which are 19.42 °/RIU and 5.45 °/RIU with FWHM = 2.28° and 0.64° respectively.

Journal of Physics: Conference Series, 2016

In this paper, we discuss modeling and simulation of single dot Single Electron Transistor (SET) ... more In this paper, we discuss modeling and simulation of single dot Single Electron Transistor (SET) using master equation approximation. For SET modeling and simulation, master equation method treats the electron tunneling and its transition probabilistically. The probability of electron tunneling is used to determine the current density in accordance with selected input parameters. The calculation results show fairly accurate electrical characteristics of SET as compared with experimental data. Staircase pattern from I-V are clearly obtained as the main role of coulomb blockade effect in SET system. We also extend our calculation by introduce some additional parameters such as; the effect of working temperature, gate voltage dependent, and the influence of resistance to the device characteristic. We found that increasing operational temperature will promote higher current density, both in forward and reverse bias region. In the case of using single dot with 30 nm × 80 nm × 125 nm dimension, coulomb blockade effect could be reduced by applying gate voltage higher than 3V and setting drain resistance higher than source's. Our studies show an alternative approach in modeling and simulation of electronic devices and could be potential for development of novel nanoelectronic devices.

Applied Physics Research, 2014

This paper reports on the development of three pieces of supercapacitor cells for portable applic... more This paper reports on the development of three pieces of supercapacitor cells for portable applications such as mobile and wearable energy storage. In a primary embodiment, the three developed supercapacitors cells, each, consist of two flexible electrodes fabricated on thin metal base substrates. The electrode, mainly a commercially prepared multiwalled hydroxyl carbon nanotubes (CPHMWCNTs), sandwich a hybrid solid polymeric separator doped with an appropriate ionic material acting as an electrolyte. The integrated separator and electrolyte layer was made of filter paper, a polyvinyl alcohol (PVA) doped with phosphoric acid at three different concentrations. The Three cells were then assembled and leveled as cell-A (C90PVdF-HFP10 |H50| C90PVdF-HFP10), cell-B (C90PVdF-HFP10 |H60| C90PVdF-HFP10) and cell-C (C90PVdF-HFP10 |H70| C90PVdF-HFP10). The evaluations of these three different electrodes and their substrate materials allowed for selection of a combination of active material and suitable percentage concentrations that yielded optimal supercapacitor performance. From the overall results of the electrochemical analysis of cyclic voltammetry (CV), cell-B delivered higher capacitance of 86.60.10 Fg −1 which was higher than the capacitance obtained by cell-C (65 Fg −1) and even doubling the capacitance obtained by cell-A (42.1 Fg −1). Whereas the charge-discharge (CD) tests carried out in the cells reveals that, even at the lower voltage window of 1.5 V, cell-B delivered better than cells A and C with a balanced and better discharge capacitance of 119.0 Fg −1 and higher energy/power densities of 597.0 Jg −1 /12.6 Jg −1 s −1 and very low internal resistance.

Journal of Materials Science Research, 2013

A separator is prepared from the resulting mixture of hybrid polymer electrolyte polyvinyl alcoho... more A separator is prepared from the resulting mixture of hybrid polymer electrolyte polyvinyl alcohol (PVA) (70%) and Phosphoric acid (H 3 PO 4) (30%) immersed in the solution of the combination of polymethyl (methacrylate) and lauroyl chitosan (PLC), for supercapacitor application. The Electrochemical Impedance Spectroscopy (EIS) was conducted twice at normal temperature in an interval of Seven days with very high electrical conductivity of to be 6.42 × 10-4 S•cm-1 and 1.84 × 10-4 S•cm-1 within these intervals respectively and very low resistance. The supercapacitor was then fabricated using a Commercially Prepared Multi-walled Carbon Nanotube (CPMWCNT) which was sized to an area of 3.5 cm 2 and assembled in an innovative supercapacitor tester. The result indicates a relatively high efficiency of about 90% and also exhibited long and excellent cycleability of life time (>1000 cycles) under different voltage windows.

Applied Physics Research, 2012

Mat Isa, Ahmad Radzi and Lee, Jia Yen and Ahmad Dasuki, Karsono and Musa, Nor Muniroh and Sabudin... more Mat Isa, Ahmad Radzi and Lee, Jia Yen and Ahmad Dasuki, Karsono and Musa, Nor Muniroh and Sabudin, Zunaidah (2007) Electronic structures of hydrogeneted silicon nanoclusters. In: Convention on Nuclear & Radioactive Material Safety, Security & Safeguards, 2007.

The British Journal of Aesthetics, 2003

... FOR SINGLE‐ELECTRON TRANSISTORS AHMAD RADZI BIN MAT ISA KARSONO BIN AHMAD DASUKI MOHD KHALID ... more ... FOR SINGLE‐ELECTRON TRANSISTORS AHMAD RADZI BIN MAT ISA KARSONO BIN AHMAD DASUKI MOHD KHALID BIN KASMIN LEE JIA YEN NOR MUNIROH BINTI MUSA PROJECT NUMBER 09‐02‐06‐0159‐SR 0000 RESEARCH VOT NUMBER 74544 ...

The supercapacitors are characterized by fast discharge rate and easy for maintenance. Their dema... more The supercapacitors are characterized by fast discharge rate and easy for maintenance. Their demand is predicted to be most extensive in frequency regulation applications. The other area for significant growth is in regenerative braking for grid-connected light rail systems. In this research we fabricated a Supercapacitor using a commercially prepared Activated carbon which was sized to an area of 1

The Method of Lines (MOL) has been one of the simplest but effective technique for solving partia... more The Method of Lines (MOL) has been one of the simplest but effective technique for solving partial differential equations (PDEs) in which all but one dimension is discretized. This work describes numerical solution of 1-dimensional Schrodinger equation using the method of lines approach (MOL) where spatial dimensions were discretized using some finite difference approximation leaving the time dimension to be the only independent variable in the resulting system of initial value problems. The effect of changing the discretization size on the accuracy of the solution procedure versus changing the step size in the integration of the resulting differential equation was also studied with the incorporation of Simpson’s rule function in MATLAB.

Solid State Phenomena, 2017

The ray tracing of unclad U-shape multimode fiber optic is examined by using Zemax simulation hav... more The ray tracing of unclad U-shape multimode fiber optic is examined by using Zemax simulation have been proposed. The influence of the geometry of sensing region such as absorbing medium refractive index, n2, shape of fiber and the bending radius is analyzed. Number of analysis ray is determined and the value of n2 is varied at 1, 1.3314, 1.359, 1.36, 1.37 and 1.4. The intensity of light propagate inside the fiber is reducing at high n2 and this graph pattern is supported by experimental result. A U-shaped sensor is used for the analysis because of the sensitivity is higher than straight fiber design due to their higher penetration depth. Zemax simulation shows that the fiber with bending radius 1.5 mm has higher response compared to fiber with radius 2.5 mm.

The demand of energy, global warming and greenhouse gas emission have forced the world to look in... more The demand of energy, global warming and greenhouse gas emission have forced the world to look into alternative sources of energy. Solar thermal technologies are regarded as the most promising technology that can supplement the usage of fossil fuels in power generation. Among the solar thermal technologies, parabolic trough solar collectors (PTC’s) from the concentrated solar power (CSP) technology are the most matured application for the production of electricity and steam generation. The development of parabolic trough solar collectors has been carried out throughout the world for different thermal applications ranging from industrial heat process to generation of electricity. In Malaysia, the use of solar thermal technology for the generation of electricity and industrial heat process is not given much attention. Therefore, the objective of this paper is to review the development of parabolic trough solar collectors (PTC’s) for different thermal applications and pointing out some...

2018 IEEE International Conference on Semiconductor Electronics (ICSE), 2018

This study discussed the effect of nanocomposite film's thicknesses on the generation of SPR ... more This study discussed the effect of nanocomposite film's thicknesses on the generation of SPR for detection of Pb²+ ions. Ag-GO nanocomposite film was deposited on the hypothenuse side of the triangular prism via Kretschmann configuration. The thicknesses of Ag-GO were varied between 50nm and 60nm by manipulating the Ag's thicknesses from 30nm to 50nm and GO's between 2nm and 10nm. The optimum SPR signal was obtained as thickness of Au-GO was fixed at 50nm with tAg=48nm and t<inf>GO</inf>=2nm resulting 75.77% of SPP excitation. As thicknesses of GO increased above 2nm and thicknesses of Ag were set less or more than 48nm, the SPP excitation became weaker. The sensitivity of SPR sensor shows a good agreement with the generation of SPP. The sensor exhibits the optimum sensitivity of s=0.452°/RIU with angle shifting of 0.905°as nanocomposite film under configuration of tAg=48nm: t<inf>GO</inf>=2nm and tAg=50nm: t<inf>GO</inf>=2nm were employed. In conclusion, the amplification of SPR sensor's sensitivity can be achieved by introducing 50nm nanocomposite films consist of ±2nm thicknesses of GO.

EPJ Web of Conferences, 2017

Gold nanoparticles (GNPs) have been known as an excellent characteristic for Local Surface Plasmo... more Gold nanoparticles (GNPs) have been known as an excellent characteristic for Local Surface Plasmon Resonance (LSPR) sensors due to their sensitive spectral response to the local environment of the nanoparticle surface and ease of monitoring the light signal due to their strong scattering or absorption. Prior the technologies, GNPs based LSPR has been commercialized and have become a central tool for characterizing and quantifying in various field. In this review, we presented a brief introduction on the history of surface plasmon, the theory behind the surface plasmon resonance (SPR) and the principles of LSPR. We also reported on the synthetization as well of the properties of the GNPs and the applications in current LSPR sensors.

EPJ Web of Conferences, 2017

Polymer optical fibers (POFs) have significant advantages over numerous sensing applications. The... more Polymer optical fibers (POFs) have significant advantages over numerous sensing applications. The key element in developing sensor is by removing the cladding of the fiber. The use of organic solvent is one of the methods to create tapered POF in order to expose the core region. In this study, the etching chemicals involved is acetone, methyl isobutyl ketone (MIBK), and acetone-methanol mixture. The POF is immersed in 100%, 80%, and 50% of acetone and MIBK dilution. In addition, the mixture of acetone and methanol is also used for POF etching by the ratio 2:1 of the volume. Acetone has shown to be the most reactive solvent towards POF due to its fastest etching rate compared to MIBK and acetone-methanol mixture. The POF is immersed and lifted from the solution for a specific time, depending on the power loss properties for the purpose of producing unclad POF. In comparison to silica fiber optic, the advantages of POF in terms of its simple technique and easy handling enable it to produce unclad POF without damaging the core region. The surface roughness of the POF is investigated under the microscope after being immersed into different solvent. This method of chemical tapering of POF can be used as the fundamental technique for sensor development. Next, the unclad fiber is immersed into ethanol solutions in order to determine the reaction of unclad POF towards its surrounding. The findings show that this particular sensor is sensitive towards concentration changes ranging between 10 wt% to 50 wt%.

EPJ Web of Conferences, 2017

Optical sensor based on surface plasmon resonance are widely used for various applications. In th... more Optical sensor based on surface plasmon resonance are widely used for various applications. In this paper, an optimization of EM waves polarization modes for the occurrence of SPR by using a modified optical waveguiding assembly has been discussed. A 633 nm of linearly polarized He-Ne laser was appointed as a light source. The polarization modes were controlled by rotating the position of He-Ne laser. It was found that the optimum SPR signal with reflectance, R = 0.21 a.u and SPR angle, θSPR = 48° can be obtained as the position of laser was rotated at 90°, with the presence of polarizer. The location of the critical angle was observed at θC = 46°. For the validation purpose, a simulation based on Fresnel equation was conducted where the percentage difference between the experimental and theoretical results were analyzed. The percentage difference between experimental and theoretical results for both θSPR and θC were 9.09% and 15.00% respectively. In conclusion, an excellent agreement between the theoretical and experimental findings proved the stability of this SPR setup, where the EM waves polarization can easily be controlled by manipulating the position of laser.

AIP Conference Proceedings, 2018

Design and analysis of a spectro-angular surface plasmon resonance biosensor operating in the vis... more Design and analysis of a spectro-angular surface plasmon resonance biosensor operating in the visible spectrum Review of Scientific Instruments 85, 093107 (2014);

Journal of Physics: Conference Series, 2019

Undoped and Al-doped ZnO thin films have been prepared by the sol gel method. Zinc acetate dihydr... more Undoped and Al-doped ZnO thin films have been prepared by the sol gel method. Zinc acetate dihydrate, ethanol and monoethanolamine were used as precursor, solvent and stabilizer, respectively. In the case of molarity study for Al-doped ZnO, aluminum nitrate nonahydrate was added to the precursor solution from 0 at. % to 6 at. % at molarity of 0.1 M, 0.2 M and 0.3 M. The optical properties were characterized using UV-Vis where the band gap of undoped ZnO increases as the annealing temperature increase and the band gap decrease as the molarity increment. Meanwhile the band gap increase upon increment of Al dopant under molarity of 0.1 M and 0.2 M due to Burstein-moss effects. Meanwhile at 0.3 M, the bandgap increase until 4 at. % of Al and suddenly decrease abruptly at 6 at. % of Al. The effect of molarity and dopant percentage on the thin film gives a different value of energy band gap.

Malaysian Journal of Fundamental and Applied Sciences, 2017

Water contamination by heavy metals is a common issue encountered in many countries due to indust... more Water contamination by heavy metals is a common issue encountered in many countries due to industrial and urban wastes in water resources which give health and socio-economic impacts. This work is carried out to investigate the effect of EM wave polarization modes on the sensing properties of surface plasmon resonance (SPR) sensor in detecting heavy metal ions namely mercury (Hg) and plumbum (Pb). Three types of polarization modes such as p-polarized, s-polarized and circular-polarized light were introduced. Gold and silver thin films with thicknesses of 50nm were deposited on top of SPR layer system to excite surface plasmon polaritons (SPPs). The SPR curves were analyzed by studying the FWHM, Q-factor and angle shifting characteristics. We manage to prove theoretically that the SPR phenomena able to be created by using not only the p-polarized light, yet by employing a circular-polarized light. The sensor shows positive respond for both polarization modes, where the troughs were r...

2016 IEEE International Conference on Semiconductor Electronics (ICSE), 2016

Nowadays, surface plasmon resonance (SPR) sensor has been widely used in biosensing applications ... more Nowadays, surface plasmon resonance (SPR) sensor has been widely used in biosensing applications to detect the wide diversity of biomolecular interactions. There are few parameters need to be concerned in order to optimize the performance of SPR sensors such as film thicknesses, type of thin films and their configurations. In this study, we seek to determine the optimum thicknesses of hybrid thin films which consist of gold-graphene oxide layers for the enhancement of SPR sensor sensitivity. By using a theoretical approach, a WINSPALL 3.02 simulator had been used to investigate the effects of various thicknesses of hybrid configuration's thin films towards the excitation of surface plasmon polaritons (SPP). A layer of 3 nm protein was added to compare the maximum adsorption of the SPR sensor based on their configuration. It was found that the optimum thicknesses of gold and graphene oxide are 50 nm and 0.68 nm respectively for achieving best sensitivity. Thus, the sensitivity value for gold-GO thin films is higher than silver-GO which are 19.42 °/RIU and 5.45 °/RIU with FWHM = 2.28° and 0.64° respectively.

Journal of Physics: Conference Series, 2016

In this paper, we discuss modeling and simulation of single dot Single Electron Transistor (SET) ... more In this paper, we discuss modeling and simulation of single dot Single Electron Transistor (SET) using master equation approximation. For SET modeling and simulation, master equation method treats the electron tunneling and its transition probabilistically. The probability of electron tunneling is used to determine the current density in accordance with selected input parameters. The calculation results show fairly accurate electrical characteristics of SET as compared with experimental data. Staircase pattern from I-V are clearly obtained as the main role of coulomb blockade effect in SET system. We also extend our calculation by introduce some additional parameters such as; the effect of working temperature, gate voltage dependent, and the influence of resistance to the device characteristic. We found that increasing operational temperature will promote higher current density, both in forward and reverse bias region. In the case of using single dot with 30 nm × 80 nm × 125 nm dimension, coulomb blockade effect could be reduced by applying gate voltage higher than 3V and setting drain resistance higher than source's. Our studies show an alternative approach in modeling and simulation of electronic devices and could be potential for development of novel nanoelectronic devices.

Applied Physics Research, 2014

This paper reports on the development of three pieces of supercapacitor cells for portable applic... more This paper reports on the development of three pieces of supercapacitor cells for portable applications such as mobile and wearable energy storage. In a primary embodiment, the three developed supercapacitors cells, each, consist of two flexible electrodes fabricated on thin metal base substrates. The electrode, mainly a commercially prepared multiwalled hydroxyl carbon nanotubes (CPHMWCNTs), sandwich a hybrid solid polymeric separator doped with an appropriate ionic material acting as an electrolyte. The integrated separator and electrolyte layer was made of filter paper, a polyvinyl alcohol (PVA) doped with phosphoric acid at three different concentrations. The Three cells were then assembled and leveled as cell-A (C90PVdF-HFP10 |H50| C90PVdF-HFP10), cell-B (C90PVdF-HFP10 |H60| C90PVdF-HFP10) and cell-C (C90PVdF-HFP10 |H70| C90PVdF-HFP10). The evaluations of these three different electrodes and their substrate materials allowed for selection of a combination of active material and suitable percentage concentrations that yielded optimal supercapacitor performance. From the overall results of the electrochemical analysis of cyclic voltammetry (CV), cell-B delivered higher capacitance of 86.60.10 Fg −1 which was higher than the capacitance obtained by cell-C (65 Fg −1) and even doubling the capacitance obtained by cell-A (42.1 Fg −1). Whereas the charge-discharge (CD) tests carried out in the cells reveals that, even at the lower voltage window of 1.5 V, cell-B delivered better than cells A and C with a balanced and better discharge capacitance of 119.0 Fg −1 and higher energy/power densities of 597.0 Jg −1 /12.6 Jg −1 s −1 and very low internal resistance.

Journal of Materials Science Research, 2013

A separator is prepared from the resulting mixture of hybrid polymer electrolyte polyvinyl alcoho... more A separator is prepared from the resulting mixture of hybrid polymer electrolyte polyvinyl alcohol (PVA) (70%) and Phosphoric acid (H 3 PO 4) (30%) immersed in the solution of the combination of polymethyl (methacrylate) and lauroyl chitosan (PLC), for supercapacitor application. The Electrochemical Impedance Spectroscopy (EIS) was conducted twice at normal temperature in an interval of Seven days with very high electrical conductivity of to be 6.42 × 10-4 S•cm-1 and 1.84 × 10-4 S•cm-1 within these intervals respectively and very low resistance. The supercapacitor was then fabricated using a Commercially Prepared Multi-walled Carbon Nanotube (CPMWCNT) which was sized to an area of 3.5 cm 2 and assembled in an innovative supercapacitor tester. The result indicates a relatively high efficiency of about 90% and also exhibited long and excellent cycleability of life time (>1000 cycles) under different voltage windows.

Applied Physics Research, 2012

Mat Isa, Ahmad Radzi and Lee, Jia Yen and Ahmad Dasuki, Karsono and Musa, Nor Muniroh and Sabudin... more Mat Isa, Ahmad Radzi and Lee, Jia Yen and Ahmad Dasuki, Karsono and Musa, Nor Muniroh and Sabudin, Zunaidah (2007) Electronic structures of hydrogeneted silicon nanoclusters. In: Convention on Nuclear & Radioactive Material Safety, Security & Safeguards, 2007.

The British Journal of Aesthetics, 2003

... FOR SINGLE‐ELECTRON TRANSISTORS AHMAD RADZI BIN MAT ISA KARSONO BIN AHMAD DASUKI MOHD KHALID ... more ... FOR SINGLE‐ELECTRON TRANSISTORS AHMAD RADZI BIN MAT ISA KARSONO BIN AHMAD DASUKI MOHD KHALID BIN KASMIN LEE JIA YEN NOR MUNIROH BINTI MUSA PROJECT NUMBER 09‐02‐06‐0159‐SR 0000 RESEARCH VOT NUMBER 74544 ...

The supercapacitors are characterized by fast discharge rate and easy for maintenance. Their dema... more The supercapacitors are characterized by fast discharge rate and easy for maintenance. Their demand is predicted to be most extensive in frequency regulation applications. The other area for significant growth is in regenerative braking for grid-connected light rail systems. In this research we fabricated a Supercapacitor using a commercially prepared Activated carbon which was sized to an area of 1