International Journal of Nanoelectronics and Materials (IJNeaM)
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IJNeaM aims to publish original work of importance in the fields of nanoscience and engineering. Topics covered including Theoretical, Simulation, Synthesis, Design and Fabrication of Nanomaterials and Nanodevices; Metals, Insulators, and Semiconductors with a focus on Electronic, Structural, Magnetic, Optical, Thermal, Transport, Mechanical and other properties for the specialists in Engineering, Chemistry, Physics and Materials Science. IJNeaM accepts submission in the form of Reviews, Research Articles, Short Communications, and selected conference papers.
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PublicationA simulation study on performance of photovoltaic thermal water (PVTW) collector under different loading of mass flow rate using ANSYS fluent(Universiti Malaysia Perlis (UniMAP), 2021-08)The renewable energy has been a widely grown field fascinated by the researchers and scientist from the public and private sector. Solar energy is considered as the most abundant energy in the present world. The purpose of this research is to determine the performance of photovoltaic thermal water collector under different design of absorber tube in steady state condition. The computational fluid dynamics (CFD) simulation is carried out by using ANSYS Fluent software. This study used the geometry drawn in computer-aided design (CAD) software SolidWorks. The model drawn are spiral, horizontal serpentine and vertical serpentine absorber tube. The model drawn in SolidWorks software is then imported into ANSYS Fluent model to obtain the meshed model. The photovoltaic panel used in this project is silicon-based photovoltaic cell. The performance of photovoltaic thermal water collector is determined with the summation of electrical performance from the photovoltaic panel and thermal performance from the solar collector under 0.001 kg/s to 0.005 kg/s with intervals 0.001 kg/s. The relationship between water mass flow rate and solar irradiance intensity on performance photovoltaic thermal system was determined. At 1000 W/m2, spiral absorber photovoltaic thermal water collector has the highest overall performance of 34.96% followed by vertical serpentine absorber of 34.07% while horizontal serpentine absorber has the lowest overall performance of 33.59%. Recommendations are proposed to improve the overall performance of the photovoltaic thermal water collector system
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PublicationA performance comparison of PID and Fuzzy Logic Control methods for trajectory tracking of wheeled mobile robot( 2021-08)Trajectory tracking involves with the geometric path and the timing law of a two-wheeled mobile robot (WMR). Due to its unlimited work area, mobile robots have a broad spectrum of applications. Trajectory tracking feature in a WMR is designed to enable the robot to follow a reference path. To further analyse this feature, this paper discusses a two-wheeled mobile robot mathematical model using a kinematic model and then compares the trajectory performance of two controllers; namely PID and Fuzzy Logic. The presented controller was designed using MATLAB/Simulink software. The observation on the controllers performance is by Integral Square Error (ISE) where Fuzzy Logic Controller was found to increase the performance of the PID controller by 50%. The result indicated that Fuzzy Logic Controller performs better than the PID controller because of its ability to minimize the error produced during the WMR trajectory tracking.
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PublicationNiobium pentoxide thin film prepared using simple colloidal suspension for optoelectronic application( 2018-04)In this study, thin‐film microstructures of polymorphous niobium pentoxide were successfully prepared at a low temperature. Spin coating was employed to deposit the colloidal suspension before and after ultrasonic vibration. The deposited films were characterised and analysed by X‐ray diffraction, scanning electron microscopy, and spectrophotometry for optical investigation. Results show that the films prepared before ultrasonic vibration possess a smooth and uniform surface. By contrast, films that underwent further ultrasonic vibration exhibit an earth rock‐like structure and a highly oriented, void‐ and crack‐free surface. Both film structures indicate the formation of a monoclinic structure. Low energy gap values of approximately 2.5 eV and 2.25 eV are suitable for heterojunction optoelectronic applications; this condition was proven by the typical I‐V behaviours of the prepared heterojunction on the silicon substrate.
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PublicationThird order nonlinear properties of rhodamine B dye doped PVA polymer determined by eclipsing scan technique( 2018-04)Nonlinear (NL) optical properties were observed in Rhodamine B (RB) dyes doped in poly (vinyl alcohol) (PVA) polymer films. Eclipsing Z‐scan (EZ‐scan) with a continuous wavelength of 532 nm was used to investigate the effect of dye concentration on its NL properties. The open aperture EZ‐scan indicates a reverse saturable absorption behavior (positive type) of NL absorption (NLA) coefficient (β) in the RB+VA matrix, whereas the closed aperture EZ‐scan exhibits transition from positive (focusing) to negative (defocusing) nonlinearity at increasing dye concentration. The NL refractive index 2, NLA coefficient , third‐order susceptibility 3, and second‐order hyperpolarizability increase with the increase in dye concentrations. The magnitude of the n2, , 3, and were in the order of 10‐12 (2/W), 10‐1 (/W), 10‐8 (esu), and 10‐12 respectively.
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PublicationDFT study of the alkali metal influence on structure and optical properties of B12 nanocluster( 2018-01)Boron with electron deficiency has the tendency in auto‐combining to form polyhedral structures. The icosahedral form of B12 is the structural block of boron clusters which undergo exothermic dimerization reaction. It was found that the annular shape of B12 was more stable in comparison with icosahedral B12. Structural and optical properties of the icosahedral form and annular shape of B12 were modified by alkali metal atoms on their surface and it was demonstrated that the reaction of alkali metal atoms with IS‐B12 is exothermic due to its instability. Additionally the alkali metal has greater effect on the optical properties of icosahedral form of B12 nanocluster. As the result, the higher polarizability was obtained for K@IS‐B12 nanocluster (269.2 and 399.2 a.u. for mono and di K atom respectively). The modification in first hyperpolarizability for mono‐alkali metal atoms on IS‐B12 surface was more considerable than di‐alkali metal atom. On the other hand, di‐alkali metal atom has slight effect on first hyperpolarizability. The maximum first hyperpolarizability obtained for mono K atom attached to IS‐B12 nanocluster (about 22500 a.u.).
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