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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PublicationGain enhancement of rectangular microstrip patch antenna using air Gap at 2.4 GHz(Universiti Malaysia Perlis (UniMAP), 2020-05)This project is carried out to design two antennas; one of them is a basic rectangular microstrip patch antenna and the other is the rectangular microstrip patch antenna added with an air gap technique for the main purpose of gain enhancement. Both antennas have been designed using RT5880 substrate because of its low dielectric constant at 2.2 and the permittivity of 0.0009. The proposed antennas were analysed and simulated at the frequency of 2.4GHz for WLAN application using the Computer Simulation Technology (CST) software. In order to increase the antenna’s gain performance, a 3 mm air gap thickness was added in between the radiating patch element and the ground layer. From the simulation results, it was realized that the antenna’s gain was enhanced from 6.907 dB (basic antenna) to 9.179 dB (antenna with 3 mm air gap) with 32.9% improvement, while the frequency is maintained at 2.4 GHz. Meanwhile, from the measurement results the gain improved 11.4% from 7.1 dB (basic antenna) to 7.91 dB (antenna with 3 mm air gap). However, the bandwidth decreased from 111.07 MHz (basic antenna) to 72.873 MHz (antenna with 3 mm air gap) from the simulation results. Both antennas prototype has been fabricated to validate the performance of the antennas. The simulated and measured results in terms of reflection coefficient, S11, gain and VSWR are presented.
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PublicationEffect of carbon supports on oxygen reduction reaction of iron/cobalt electrocatalyst(Universiti Malaysia Perlis(UniMAP), 2020-05)Dual metal FeCo has great potential as Pt-free catalyst in various applications, such as cathodic catalyst for fuel cells, in order to reduce the cost significantly and make fuel cell commercialization, viable. In this study, dual metal FeCo catalyst supported on carbon Vulcan XC-72, carbon nanotubes (CNT), and reduced graphene oxide (rGO) were successfully prepared via facile co-precipitation method with varying weight ratios of Fe and Co. The structure of the as-prepared catalysts was characterized by powder X-ray diffraction (XRD), scanning electron micrographs (SEM), and X-ray photoelectron spectroscopy (XPS). The XPS analysis revealed that CoFe2O4 were present on the catalyst particle surface with different Fe to Co ratio. The emergence of the new peak at 530.5 eV is assigned to the deposition of CoFe2O4, which is enabled via Fe-O-Co bonds. The FeCo/rGO catalyst with weight ratio of 2:1 exhibited the optimum performance for oxygen reduction reaction (ORR), with reduction peak of 0.163 mA cm-2 at 0.385 V vs. Ag/AgCl in an acidic media. The experimental result suggested that the dual metal FeCo catalyst display favourable electrocatalytic activity towards ORR and appears to be a promising cathodic electrocatalyst for an acidic fuel cell.
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PublicationVision-based assets tracking and maintenance management on the production floor of integrated semiconductor devices(Universiti Malaysia Perlis (UniMAP), 2020-05)The paper presents a cost-effective system for hardware assets (transportation carts and integrated circuit (IC) carriers) tracking and maintenance management on the production floor of a large-scale IC manufacturing plant. Currently, the preventive maintenance (PM) on these assets is implemented mostly by having the technicians to go around the factory floor to find the items that are due for maintenance. This is done by looking at the label information attached to each and every cart and magazine or IC carrier. Furthermore, after the PM procedure, the label on the cart/magazine has to be replaced by a new one with updated information. This a very time consuming and inefficient process. Inevitably, a new approach needs to be looked into in order to improve time efficiency as well as the accuracy of the assets tracking. One way is to replace the paper data entry to electronic data entry by using tagging and tracking technologies. The asset tracking identifier must be durable to withstand high-temperature conditions (up to 170OC). Several technologies have been analyzed such as barcode-based identification, Radio Frequency Identification (RFID), Global Positioning System (GPS), iButton application, and Wi-Fi localization. Subsequently, the barcode technology was chosen due to its usage simplicity, cost-effectiveness, durability in the high-temperature environment (with appropriate lamination), and tag power independence. The proposed barcode technology solution uses handheld intelligent terminals with wireless communication capabilities and a host computer with a database linked not only to the preventive maintenance methodology but also to the integrated production information system of the production plant. In addition, the locations of the assets are tracked and can be shown on a visual factory map so that the staff can collect the carts and magazines easily. As a result, the system has dramatically improved preventive maintenance to make this process more convenient for the maintenance management task. Further expansion of the system by incorporating the visible-light positioning technique is proposed and elaborated as the direction for future development.
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PublicationStatistical analysis on the effect of machining conditions towards surface finish during edge trimming of carbon fiber reinforced plastics (CFRP)(Universiti Malaysia Perlis (UniMAP), 2020-05)The main aim of this work was to investigate the effect of machining conditions namely cutting speed (Vc) and feed per tooth (fz) towards the surface finish during the edge trimming process on a specific CFRP material. The range of cutting speed (Vc) applied was 50 m/min (low), 100 m/min (middle) and 150 m/min (high) whilst for the feed per tooth (fz); 0.05 mm (low), 0.10 mm (middle) and 0.15 mm (high). The CFRP panel is measured 3.25 mm in thickness and has 28 plies in total. Router or burr tool made of uncoated tungsten carbide with a diameter of 6.35 mm is used to perform the edge trimming process. The Taguchi technique has been adopted to plan the overall experimental process. Surface roughness measurement was taken using Mitutoyo Surftest SJ-410 and optical microscope Nikon MM-800 is utilized to further observe the quality of the trimmed surfaces. From the ANOVA analysis, both factors namely cutting speed, Vc and feed per tooth, fz indicated a significant result towards the surface finish of the trimmed surfaces. The result is supported by the observation via optical microscopy which clearly exhibits uncut fibers, fiber pull-out and matrix degradation conditions. Detailed results are elaborated and discussed further in this paper.
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PublicationMarıne calcıum hydroxyapatıte as embryonıc materıal for excellent performance of perovskıte solar cell(Universiti Malaysia Perlis (UniMAP), 2020-05)Marine calcium hydroxyapatite (HAp) extracted from fish bone has been perceived to be good as it carries good bioactivity and biocompatibility. In fact, the production of HAp from synthetic process involves many chemicals and complicated procedures which affect the stability. Extraction process of Hap from Selayang fish bone started with boiling fish bones to eliminate adherent fish meats, drying process and grinding process to obtain the powder. The extracted calcium was further used in syhthesis of calcium titanate perovskite (CaTiO3) for solar cell application. CaTiO3 has been known as a material with high efficiency and smaller band gap which fulfill the requirements for fabrication of the solar cell. The perovskite were synthesized in various ratios to observe the stability and coequal character with the standard perovskite. The novelty of this study lies between the method of extraction of HAp and the fabrication of perovskite where the calcium is substituted with HAp. The obtained HAp and CaTiO3 were characterized by using TGA, XRD and FTIR. The analytical results shows that HAp were formed after the calcinations process at 900°C and crystalinity of CaTiO3 was found at XRD peaks 47.8°, 48.2° and 68.5°. Highest efficiency was measured at sample H1T1 perovskite with 5.3%.