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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PublicationActive control of silver nanostructure aggregates for ultrahigh sensitive SERS detection of organic molecules: single molecule approach(Universiti Malaysia Perlis (UniMAP), 2019-01)P-type and n-type of Porous Silicon (PSi) substrates have been prepared by electrochemical and photo-electrochemical etching processes, respectively. Unique morphological features of PSi were employed to synthesis efficient and low cost Surface-Enhanced Raman Scattering (SERS) active substances by incorporating different forms of silver nanoparticles AgNPs. Ion reduction process of silver ions by three types of PSi samples was used to develop AgNPs, Ag cluster, and Ag loop aggregates-based active SERS substrates for efficient detection of Cy3 dyes molecules. The performances of the active SERS substrates were studied extensively through analysis of scanning electron microscopy and Raman spectra. The results show that the detection process of Cy3 dyes molecules was increased with increasing the density of hot spot’s regions. The developed AgNPs aggregate/p-PSi substrate with the smallest inter-particle gap size exhibits the strongest SERS enhancement and produced the best reproducibility as compared with the other two substrates. The amplified Raman efficiencies for AgNPs aggregate/p-PSi, Ag cluster aggregate/n-PSi, and Ag loop aggregate/n2-PSi substrates were calculated to be 10¹⁰, 10⁶, and 10³, respectively. The experimental results show that the AgNPs aggregate/p-PSi SERS substrate exhibited significant enhancement factor of 1.07 × 10¹³ for 10⁻¹⁴ M dye concentration using single molecule detection technique.
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PublicationThermal effect on mirror reflectivity based on DBR for optoelectronics devices(Universiti Malaysia Perlis (UniMAP), 2019-01)In this work, the thermal effect on the mirror reflectivity based on distributed Bragg reflector (DBR) in terms of the center wavelength shifting and reflectivity ratio is theoretically investigated and experimentally validated. The temperature of the proposed device was varied between the range of 300K to 400K in steps of 20K. According to the results, the achievement shifting in the center wavelength is about 25nm from (1580nm to 1605nm) and 26.9nm from (1580nm to 1606.9nm) for the theoretical and experimental work, respectively. In addition, about 99.99% within the theoretical and for the experimental work is about 97.3% of reflectivity ratio were achieved by the proposed device. Finally, the experimental results show a good agreement with the simulation design.
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PublicationPreparation and Characterization of Magnetite (Fe₃O₄) Nanoparticles By Sol-Gel Method(Universiti Malaysia Perlis (UniMAP), 2019-01)The magnetite (Fe₃O₄) nanoparticles were successfully synthesized and annealed under vacuum at different temperature. The Fe₃O₄ nanoparticles prepared via sol-gel assisted method and annealed at 200–400 °C were characterized by Fourier Transformation Infrared Spectroscopy (FTIR), X-ray Diffraction spectra (XRD), Field Emission Scanning Electron Microscope (FESEM) and Atomic Force Microscopy (AFM). The XRD result indicate the presence of Fe₃O₄ nanoparticles, and the Scherer’s Formula calculated the mean particles size in range of 2–2.5 nm. The FESEM result shows that the morphologies of the particles annealed at 400 °C are more spherical and partially agglomerated, while the EDS result indicates the presence of Fe₃O₄ by showing Fe–O group of elements. AFM analyzed the 3D and roughness of the sample; the Fe₃O₄ nanoparticles have a minimum diameter of 79.04 nm, which is in agreement with FESEM result. In many cases, the synthesis of Fe₃O₄ nanoparticles using FeCl₃ and FeCl₂ has not been achieved, according to some literatures, but this research was able to obtained Fe₃O₄ nanoparticles base on the characterization results.
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PublicationSynthesis, characterization and visible light/NIR photodetector of CuO nanowires fabrication(Universiti Malaysia Perlis (UniMAP), 2019-01)This works successfully synthesized vertically aligned, high density, long, large aspect ratio of CuO nanowires (CuO NWs) via thermal oxidation of copper (Cu) foil with atmospheric air. The oxidation process was conducted under temperature and time variation. The morphology and structure properties of CuO NWs were investigated by scanning electron microscope (SEM) and X-ray diffraction (XRD) respectively. UV-Visible spectrophotometer was also used to estimate the direct band gap (1.75 eV) from the transmission spectrum. Furthermore, the film exhibit high absorption in the visible range and near infrared wavelength. The optimized parameters for long, small diameter, high density of CuO NWs at oxidation temperature of 500 °C for 6–8 h in the atmospheric air were found. The diameter and length of CuO NWs was determined within the range of 50–100 nm and 20–30 µm respectively. These optimized properties of CuO NWs make it a dependable candidate for visible light/near-infrared (NIR) photodetector fabrication. Therefore, the photodetector measurements were proved to render an acceptable performance.
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PublicationThe Influence of Nitrogen Pressure on the Structure of a-CNₓ Thin Films Prepared by PLD Method(Universiti Malaysia Perlis (UniMAP), 2019-01)The structure of amorphous CNₓ thin films has a variety of chemical bond, and studies on these bonds ratios are very important because these ratios determine the appropriate technical use of these films. Therefore, this paper aim to investigate the relation between the conditions of preparation (deposition pressure) of a-CNₓ thin films prepared using PLD (Pulsed Laser Deposition) method and the film's structure. Results shown that the deposition pressure variation does not affect the concentration in the same manner for all bonds in the film. Moreover, the sp² cluster size and the order degree are related to the numerical value of the deposition pressure.