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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PublicationNumerical analysis of the ZnGeN2 layer effect on InGaN/GaN multiple quantum well light-emitting diodes( 2024-01)This paper discusses the effect of a ZnGeN2 layer inserted into the wells of Type-I InGaN/GaN QWs LEDs on the electrical and optical properties by using the Silvaco TCAD Simulator. First, the new structure is compared to the standard type-I LED based on InGaN. We found that using ZnGeN2 layer in the In0.2Ga0.8N-QWs LED leads to wavelength extending from the blue to the red region. Next, we highlighted the effect of quantum well number and In-molar fraction in the wells of InxGa1-xN/ZnGeN2 type-II LEDs. As a result, increasing the number of wells from two to six QWs creates an extension of spontaneous emissions while keeping a low concentration of indium in the wells (x = 0.16) and improving the electrical and optical properties, as we found an improvement in light output power of 10.7% at 40Acm-2.
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PublicationSynthesis and characterization of hematite Fe₂O₃ nanofiller for enhanced dielectric and microwave-absorbing properties in PTFE composites( 2024-01)This paper presents the synthesis of hematite Fe₂O₃ nanofiller from mill scales and its application in polytetrafluoroethylene (PTFE) composites for enhanced dielectric and microwave-absorbing properties. The nanofiller was obtained through 9 hours of high-energy ball milling, resulting in a particle size reduction 43.6 to 11.05 nm. The PTFE/Fe₂O₃ composites were fabricated by dispersing different concentration of Fe₂O₃ nanofillers using the dry powder processing technique. The structural and morphological characterization of the nanofiller and PTFE/Fe₂O₃ composites was carried out using X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM), respectively. The composites’ microwave absorption properties were analyzed utilizing vector network analyzer (VNA) measurements in the 8–12 GHz frequency range. Based on the findings from the results, as the percentage of filler increased from 5 to 15%wt, the composites' loss tangent and dielectric constant increased from 0.0272 to 0.0478 and 2.12 to 3.25, respectively, while their reduced signal transmission speed was between 2.21 and 2.07 x 108 m/s at 8 GHz and from 2.24 to 2.11 x 108 m/s at 12 GHz. These findings demonstrate that Fe2O3 nanoparticles are a suitable material for developing microwave-absorbing polymer composites within the 8–12 GHz frequency range.
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PublicationMorphological, structural and optical properties of Er3+-doped SiO₂-TiO₂ nanofiber( 2024-01)SiO₂ and TiO₂ are often used in optical film due to their chemical stability and they have been proven as a favourable host for rare earth ions. Nanofiber has been widely studied because it possesses a high surface area per unit mass as well as low-cost production. In this study, sol-gel and electrospinning methods were used to synthesize and fabricate Er3+-doped SiO₂-TiO₂ nanofiber with different ratios of SiO₂/TiO₂, respectively. The morphological, structural, and optical properties of the nanofiber were studied. The FESEM result shows that the produced fibers have diameters between 67 to 538 nm. The FTIR spectra imply that the main structure of the nanofiber remains unchanged despite the increasing of TiO₂ content in the host matrix. The obtained XRD results indicate that all samples correspond to the amorphous phase. Besides, the optical transparency of all the fabricated samples demonstrated a high transmittance (88% to 93%) which was ideal for photonic applications. The PL spectra showed strong green emission peaks associated to 2H11/2 → 4I15/2 of Er3+ transitions under an excitation wavelength of 350 nm.
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PublicationA review of nanotechnology in self-healing of ancient and heritage buildings( 2024-01)The field of nanotechnology has revolutionized the architectural sector, particularly in the domain of preserving cultural heritage. The gradual deterioration and degradation of ancient and heritage buildings pose significant challenges for the conservation of our cultural legacy. This review aims to emphasize the crucial role of nanotechnology in extending the lifespan of archaeological materials and artefacts, which are essential components of our cultural heritage. Archaeology encompasses both theoretical and applied methods, with applied archaeology involving activities such as excavation, restoration, and monument conservation. These practices heavily rely on the integration of novel findings from various disciplines including physics, chemistry, and geology. Nanotechnology has emerged as a promising approach within the realm of applied archaeology, offering innovative solutions for the preservation of organic and inorganic archaeological materials. This research focuses specifically on the applications of nanotechnology in conserving and restoring inorganic archaeological materials, particularly stone artefacts and buildings constructed from materials such as limestone or sandstone. By exploring the potential benefits and highlighting the significance of nanotechnology, this study seeks to underscore its role in safeguarding our cultural heritage and promoting sustainable construction practices.
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PublicationDFT modeling of new composite based on PANI/PVK functionalized With single-walled carbon nanotubes for optoelectronic applications( 2024-01)We present a comparative experimental and theoretical study of the vibrational, optical, and electronic properties of polyaniline at both emeraladine leuco-emeraldine forms and PVK. Our objective is first to select the appropriate form of PANI to be linked with PVK to form a hybrid polymer matrix. Then, on the basis of quantum chemical calculations, we present a theoretical study of a hybrid composite PANI/PVK functionalized with lower radius (5, 5) chiral single-walled carbon nanotubes (SWCNTs). The relationship structure-properties of the resulting nano-composite are proved based on the conformational and optical study made from Density functional theory (DFT) and time-dependent density functional theory (TD-DFT) using B3LYP method with 6-31-G(d) basis set. First, it has been demonstrated that the resulting interaction between PANI and PVK leads to more advantageous properties, such as good optical absorption compatibility with the solar emission spectrum. It has also been found that after the incorporation of SWCNTs into the matrix of PANI/PVK hybrid polymer, a good organization of SWCNTs via π-staking interaction is imposed by polyaniline sequences. However, PVK moieties are grafted on the sidewalls of SWCNTs. Finally, the electronic structure of the resulting hybrid nano-composite PANI/PVK/SWCNTs was carried out with the use of different electrodes on both sides.