The 10 most-cited articles in Advanced materials research, 2022

In the present investigation Co doped Sm2O3 nanostructures (NS) with different concentrations (1%, 3% and 8%) synthesized by thermal decomposition and surface reduction methods using sodium hydroxide as precipitating agent. Flake-like shaped semiconductor crystal features, morphology, optical absorptivity, chemical composition determined by XRD (X-ray diffraction), SEM (scanning electron microscopy) and UV-Visible. Flake-like morphology of the NS observed in SEM analysis having grain size varies in between 80 and 96 nm. XRD pattern depicted mixed phase of cubic crystal structure with crystallite size lying between 36.8 and 29.9 nm. Red shift in the optical absorptivity was observed in the spectrum, and spectral shift from ultraviolet to visible region with optical band gap (Eg) value decreases from 4.33 to 2.01 eV. Upon excitation with ultraviolet radiation (excitation = 300 nm), NS showed red emission in all concentrations of Co dopant and maximal emission intensity appeared at 485.5 nm for 8% of Co dopant concentration. The NS finds prominent utility in the field of…

Nickel ferrite NiFe 2 O 4 nanoparticles were synthesized through sol-gel auto combustion method using dextrose as a fuel. The prepared nanoparticles were investigated for their structural, optical and magnetic characterization. X-ray diffraction (XRD) revealed the development of single-phase cubic spinel with crystallite size of 14 nm. The optical study showed that the compound has an optical band gap 2.26 eV. The magnetic properties were investigated through M-H hysteresis curve. The photocatalytic activity of nickel ferrite was studied based on the degradation of methylene blue (MB) as a model compound, where the results showed that prepared nanoparticles possess a good photocatalytic activity.

Abstract: In the present studies, gadolinium doped cobalt oxide nanostructures (1 wt. %, 5 wt. % and 10 wt. %) were synthesized by co-precipitation method. The samples were characterized by SEM (scanning electron microscopy), XRD (X-ray diffraction spectroscopy), UV-Visible spectroscopy. UV-Visible exhibited maximum absorption at 440.81 nm for Gd(10% wt)Co3O4 Band gap energy was calculated using Tauc plots and it was observed that band gap energy decreased from 7.74 eV to 2.64 eV upon increasing the doping percentage of Gd to Co3O4. The crystallinity of the Gd(10% wt) Co3O4 NS increased as compared with Gd(1% wt)Co3O4 NS. SEM morphology revealed average particle size were between 95 nm to 78 nm uniformly distributed over Co3O4 NS.

Gas sensors have been widely implemented to solve concerns of air pollution, monitor human health, and crop yields. Because of its high sensitivity, quick response time, and short recovery time, metal oxide semiconductor (MOS) gas sensors have become a significant topic of research in the field of gas sensing. In the recent decade, many researchers are work on the different types of pure and doped MOS for improve gas sensor response. The present research work deals with the fabrication of p-n heterojunction thin films on alumina substrate by using thermal evaporation technique for reducing gas sensing application. In the current research work, ZnO is used as a functional material and MgO as a dopant. The structural, electrical, and gas sensing properties of fabricated p-n (CuO-ZnO) heterojunction thin films were studied. The resistivity of p-n heterojunction thin films was found to be 23.461Ω/m. The found to be negative to p-n heterojunction thin films. The morphological, elemental and structural characterization of fabricated CuO-ZnO heterojunction thin films were analyzed by using…

A copper metal organic frame work (MOF) is synthesized by taking adequate concentration of 2-mercaptobenzothiazole, 2-bromomalonaldehyde, 1,4 dicarboxylic acid and copper nitrate. Cu-MOF /Ag2O and Cu-MOF/rGO composites are fabricated and is characterized by XRD, UV-Vis spectroscopy and FT-IR. The band gap of the MOF/ nanocomposites is reduced when compare to individuals so that a good visible light harvesting catalyst is formed. This reduction of band gap is due to the either create of shallow state with small ionization energy, very close to the valence and conduction band edge. KEYWORDS: Mercaptobenzothiazole, 2-bromomalonaldehyde MOFs, Copper Composites, Optical Properties, Ag2O, rGO.

Amorphous metal organic frame work (MOF) with copper was a newly synthesized Cu-MOF which has been converted into a crystalline Cu-MOF with addition of nanometal oxide due to assembling of nanometal oxide on Cu-MOF/nanocomposite. The band gap of Cu-MOF/Ag2O and Cu-MOF/rGO has enhanced from visible light harvesting compound to near and far UV light harvesting material due to quantum size effect and can be used as coating material on appliances working under UV light without any degradation.

One of the most important factors influencing the quality of the weld created by the micro friction stir welding is the amount of heat generated during the welding operation. Due to the lack of proper mixing of materials at low temperatures, joints' quality decreases due to the formation of cold welds. Also, overheating takes the process out of solid-state welding, which prevents good joints. Finite element analysis of friction stir welding leads to a better understanding of the effect of different parameters on the process. With the results extracted from such analysis, some of the output can be predicted, such as heat distribution. In the present study, in order to perform finite element analysis of the micro friction stir welding of Al 1050 to pure copper, the coupled Eulerian-Lagrangian method in Abaqus software has been used. The results of finite element analysis showed that the heat distribution on the copper side is wider due to the higher heat transfer coefficient of copper than aluminum. The maximum temperature in the analysis was recorded in the weld line, which was…

Developing an accurate means of classifying defects, such as crystal-originated pits, surface-adhered foreign particles, and process-induced defects, using scanning surface inspection systems (SSIS) is of paramount importance because it provides the opportunity to determine the root causes of defects, which is valuable for yield enhancement. This report presents a novel defect classification approach developed by optimizing the linear-based channeling (LBC) and rule-based binning (RBB) algorithms that are applied to a commercially available SSIS (KLA-SP5), in combination with test sample selection including the signature defect patterns associated with the typical crystal growth process. The experimental results demonstrate that defect classification is possible with an accuracy and purity above 80% using the LBC algorithm and 90% using the RBB algorithm.

Fundamental and applied research depends on the removal of organic toxic effluents from textile industries. Photocatalytic dye degradation of CuO-NiO nanocomposite has been studied against methylene blue (MB) dye. CuO-NiO nanocomposite has been prepared by hydrothermal method using radish (Raphanus sativus) leaves as green fuel. Prepared composite nanoparticles (NPs) are characterized by XRD, FTIR, UV-DRS and SEM with EDS for the elemental and structural information. XRD data indicated the formation of monoclinic and hexagonal crystallite structures for CuO and NiO respectively. FTIR confirmed the presence of Cu - O and Ni - O molecular vibrations. Surface morphology and elemental composition of composite was analysed by SEM with EDS. CuO-NiO nanocomposite is capable to degrade 70 % of methylene blue (MB) dye in 180 min under UV light interactions. Recyclability is also good even after 4 cycles of degradation experiment for the CuO-NiO composite.

The main objective of this study was to investigate the influence of using magnetized water on the mechanical properties and durability behavior in terms of freeze-thaw resistance of recycled aggregate concrete. In addition to the effect of different numbers of water rounds in the magnetic field, other variables including steel fibers, super-plasticizers and silica-fume were considered in the concrete production in order to achieve the ideal possible performance for recycled aggregate concrete made with 100% coarse aggregates replacements. For this purpose, a total of 11 concrete mixes were prepared and tested. At the first step, the effects of the mentioned variables on the basic properties, including workability, water absorption, compressive strength, splitting tensile strength, flexural strength and freeze-thaw durability test were investigated. Additionally, flexural toughness was evaluated in accordance with the post-crack strength (PCS) method and the microstructure of concrete specimens was also observed by using scanning electron microscope (SEM). The results of most…