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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PublicationDesign and fabrication flow focusing microfluidic device for continuous dielectrophoretic separation(Universiti Malaysia Perlis (UniMAP), 2020-12)We present a flow focusing microfluidic device for continuous dielectrophoretic separation. Our method relies on our unique microfluidic geometry which performs hydrodynamic focusing, generates flow with three inlets and three outlets. To improve particle separation in array type microelectrode, we hydrodynamically focus the main flow into the region of interest to the gap between the two electrodes. We design the geometry of the device using 3D CAD software and study the fluid flow using Comsol Multiphysics 5.4. Then, we fabricate this microfluidics device using the micro-milling process combine with soft lithography using PDMS. Lastly, we do an experimental flow setup using our microfluidic device to see the hydrodynamic flow focusing within the channel with three different main flow rate ratio to the sheath flow.
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PublicationGeneration of multiple resonance wavelengths from one dimensional photonic crystal wire for nanoscopic wavelength division multiplexing system(Universiti Malaysia Perlis (UniMAP), 2020-12)Wavelength division multiplexing (WDM) is a core technology for high-bandwidth data transport system. As one of the major components in WDM system, a smaller footprint of multiplexer with two or more wavelengths is needed and photonic crystal (PhC) is a good candidate to make this approach feasible. PhC offers nanometer scale devices that can be fabricated via the existing matured silicon technology. We have modelled and simulated the design with FDTD solutions and show that multiple number of wavelengths can be generated via one-dimensional (1D) multiple cavity PhC wire. In this report, we show that with the introduction of three cavities in between embedded PhC holes, three fundamental resonance wavelengths at 1645.60, 1670.76 and 1698.68 nm were excited respectively. The number of resonance wavelengths were excited additively with the number of cavities. We observed asymmetrical free spectral ranges (FSR)s at 25.16 and 27.92 nm respectively for the generated wavelengths. The wavelengths can be tailored to any wavelength ranges; limited to silicon’s light absorption and index. However, a complex mathematical algorithm is needed to control the FSR. The results in this study will contribute to the device development for future WDM equipment miniaturization.
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PublicationTheoretical demonstration of elastic wave guiding in a pillar-based phononic crystal slab(Universiti Malaysia Perlis (UniMAP), 2020-12)We demonstrated theoretically the wave guiding of elastics waves in a two-dimensional (2D) phononic crystal (PnC) slab. The simulation model based on the Finite Element Method (FEM) was used to calculate the dispersion relation of unit cells that shows a complete band gap between frequency, f=312–412 kHz. The supercell technique to simulate two waveguides size shows filtering frequencies between 365-397 kHz within the band gap. We discuss the frequency shift of the wave guide as a function of the defect size for the possibility of elastic wave filtering application.
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PublicationEffect of water molecules toward the structural and electronic properties of prussian blue cathode material for potassium battery: a first principles investigation(Universiti Malaysia Perlis (UniMAP), 2020-12)Fe(CN)6 vacancies will usually form in the process of Prussian Blue synthetization due to rapid precipitation then will be occupied by water (H2O) molecules. Through first principles calculation, this situation is simulated and the effect of water H2O molecules toward the electronic and structural properties are reported and discussed. In these theoretical calculations, the structural properties and electronic properties of pure PB and hydrated PB have been analysed by using density functional theory (DFT). Based on density functional theory (DFT), generalized gradient approximation (GGA-PBE) and GGA+U were used as exchange correlation functionals. As the result, bandgap for GGA-PBE+U was obtained 1.66 eV for pure Prussian Blue (PB). The defect and water molecules were found to influence on the bandgap and density of state of this material and 1.033 eV bandgap were obtained. Base on the lattice parameter, the structure of hydrated PB are shrinking and distorted from the ideal cubic. The structure is weakened as the bond order (BO) for the Fe-N drop about half of the original value.
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PublicationPerformance comparison between sapphire and SiC as substrate for GaN 2D photonic crystal(Universiti Mlalaysia Perlis (UniMAP), 2020-12)In this work, we present a structure design L3 cavities of 2D photonic crystal on a triangular photonic crystal lattice on Gallium Nitride (GaN) with two different substrate sapphire and SiC. The designed was simulated with LUMERICAL finite different time domain (FDTD). The resonant wavelength and quality factor (Q-factor) of design PhC structure were studied. The forbidden region or stop band observed are between 420 to 520 nm. The performance of the Q-factor has been enhanced with sapphire and SiC substrate, where the highest Q-factor that obtained are 22 500 and 28 400 respectively.