Showing papers by "M.H. Ehsani published in 2022"
TL;DR: In this article , the effect of annealing on the ZnO/Cu/ZnO films prepared by an RF/DC magnetron sputtering system was studied.
6 citations
TL;DR: In this paper , bimetal-terephthalate (i.e., CoZn-bdc) metal-organic-framework (MOF) structures with bud-like morphology are grown onto nickel foam by a one-step reductive electrochemical procedure, which are used as electrode active materials for supercapacitor.
6 citations
TL;DR: In this paper , an indirect electrodeposition technique is applied for developing single and bimetal-MOFs onto a porous nickel-foam (NF) support, which is found to have significant applications in a supercapacitor as binderless electrodes.
4 citations
TL;DR: In this paper , a new family of biopolymer-based photodetectors is described, where chitosan (CS) was utilized as a safe, biodegradable host Biopolymer, and nanostructured barium tungstate (BaWO 4 ) particles were used as the nanofiller of the biopolymers matrix to prepare flexible optical sensors, which showed high flexibility and sensitivity to UV/proton/alpha and laser irradiation.
3 citations
TL;DR: In this paper , the impact of different metals (Ag, Pt and Au) on the ZnO/metal/ZnO samples, being coated on a Glass substrate via RF/DC magnetron sputtering system, is investigated.
Abstract: In this paper, the impact of different metals (Ag, Pt and Au) on the ZnO/metal/ZnO samples, being coated on a Glass substrate via RF/DC magnetron sputtering system, is investigated. The structural, optical, and thermal properties of the as-prepared samples were systematically studied for the purpose of storage and production of energy in industry. Our results show that these layers can be used as suitable coatings on building windows for energy storage applications. In the same experimental conditions, the case of Au as the intermediate layer has shown to have better optical and electrical conditions. Then the Pt layer also led to further improvement of the properties of the samples rather than those of the Ag. Moreover, the ZnO/Au/ZnO sample has shown the highest transmittance at the visible region (68.95%) and the highest FOM (5.1 × 10-4 Ω-1). Therefore, it can be considered as relatively the optimum sample in order for the building windows to save energy because of its low U-value (2.16 W/cm2 K) and low emissivity (0.45). Finally, by applying the equivalent voltage of 12 V at the ends of the sample, the surface temperature of sample has risen from 24 to 120 °C.
3 citations
TL;DR: In this article , it was shown that the unit cell volume gradually decreases by replacing La with Er, and a widening of the transition temperature span gives rise to the spreading of the magnetic field induced entropy maximum over a broad temperature interval, resulting in a considerable enhancement of the relative cooling power.
2 citations
1 citations
TL;DR: In this article , the results obtained from the X-ray diffraction technique, the crystalline structure of substrates and the angle of depositions along with their effects on the structure of SnS nano-plates have been investigated.
Abstract: In this work, Tin (II) sulfide films have been deposited on glass, Indium Tin Oxide, and Fluorinated Tin Oxide substrates at the deposition angles of 0º, 65º, and 85º using Physical Vapor Deposition method equipped with Glancing Angle Deposition technique. Based on the results obtained from the X-ray diffraction technique, the crystalline structure of substrates and the angle of depositions along with their effects on the structure of SnS nano-plates have been investigated. Using Raman analysis, the phonons lifetime of the samples was found to change with the type of substrate and the employed deposition angle. Based Energy-dispersive X-ray spectroscopy analysis, the atomic ratio of Sn to S was observed to change with the change of deposition angle, substrate type and variation the diameter of nano-plates. This phenomenon resulted the formation of the second phase of Sn2S3 which was confirmed by Raman and X-ray diffraction patterns. The nano-sheets-like growth of all the samples has been confirmed using Felid Emission Scanning Electron Microscopy analysis. For further morphological studies, the Atomic Force Microscopy analysis has been applied, by which the direct relation between the substrate roughness and the final structure of the samples has been observed. The relation between the substrate roughness and the deposition angle in the growth process of SnS nano-sheets has been explained.
TL;DR: In this article, a thermal evaporation method equipped with Glancing Angle Deposition technique at zero and different oblique incident flux angles (α, −20°, 40, 50, 60, and 80°) was used to synthesize CdS films and the physical properties of the samples were systematically investigated by X-ray diffraction, field emission electron microscopy (FESEM), and Ultraviolet-visible spectroscopy analyzes.
Abstract: CdS films have been synthesized using a thermal evaporation method equipped with Glancing Angle Deposition technique at zero and different oblique incident flux angles (α = 20°, 40, 50, 60, and 80°). The physical properties of the samples were systematically investigated by X-ray diffraction (XRD), field emission electron microscopy (FESEM), and Ultraviolet–visible spectroscopy analyzes. The XRD analysis revealed the hexagonal structure of the films deposited at α = 0–80°. The FESEM analysis confirmed the uniform formation of the nano columnar structure of CdS samples prepared at different values of α. Finally, high transmission of the sample produced at 80° deposition angle in the wavelength range of 500–1100 nm has been shown rather than those deposited at the other deposition angles, despite its high thickness (approximately 500 nm).