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Articles 1 - 4 of 4
Full-Text Articles in Physical Sciences and Mathematics
Third-Order Nonlinear Optical Properties Of Chemically Synthesized Copper Oxide Nanosheets, Mahdi Shahmiri
Third-Order Nonlinear Optical Properties Of Chemically Synthesized Copper Oxide Nanosheets, Mahdi Shahmiri
mahdi shahmiri
Copper oxide (CuO) nanosheets were obtained by a quick-precipitation method using Cu(NO3)2 and NaOH in the presence of polyvinylpyrrolidone (PVP). Different sizes of CuO nanosheets were achieved by varying the PVP concentration. The crystal structure, morphology, and optical properties of the CuO nanosheets were characterized by X-ray diffraction, transmission electron microscopy, and diffuse reflectance spectroscopy. Higher PVP concentrations produced CuO nanosheets with enhanced crystalline structure, reduced particle size, and enlarged band gap. Nonlinear optical characteristics were examined by the Z-scan technique using a blue continuous wave laser beam operated at 405 nm. Increased PVP concentration from 0.5 wt% to 5 …
Preparation Of Pvp-Coated Copper Oxide Nanosheets As Antibacterial And Antifungal Agents, Mahdi Shahmiri
Preparation Of Pvp-Coated Copper Oxide Nanosheets As Antibacterial And Antifungal Agents, Mahdi Shahmiri
mahdi shahmiri
Copper oxide (CuO) nanosheets synthesized in polyvinylpyrrolidone (PVP) were characterized with respect to antimicrobial activity by quick precipitation method. Different sizes and shapes of CuO nanosheets were obtained by simple variations of PVP concentrations. The x-ray diffraction results revealed the formation of pure-phase CuO with monoclinic structure. Transmission electron microscopy analysis showed that the average ratio of length to width of these nanosheets increased with increasing PVP concentrations. Due to the quantum size effect, CuO nanosheets exhibit a blue shift in the ultraviolet-visible spectra. Field emission scanning electron microscopy results showed that as the concentration of PVP increased, well-defined morphologies …
Synthesis And Characterization Of Cuo Nanosheets In Polyvinylpyrrolidone By Quick Precipitation Method, Mahdi Shahmiri
Synthesis And Characterization Of Cuo Nanosheets In Polyvinylpyrrolidone By Quick Precipitation Method, Mahdi Shahmiri
mahdi shahmiri
In this project, CuO nanosheets were grown successfully in polyvinylpyrrolidone (PVP) by a simple and quick chemical method in the absence of templates. Copper nitrate, PVP and sodium hydroxide were used as copper precursor, stabilizer and accelerator, respectively. The products were characterized by X-ray diffraction (XRD), UV–vis spectroscopy, field emission scanning electron microscopy (FE-SEM), energy dispersive analysis of X-rays (EDAX), transmission electron microscopy (TEM) and Fourier transform infrared (FT-IR) spectroscopy. The result of the XRD and EDAX confirmed the formation of pure single-phase CuO. Generation of the CuO nanosheets and nanorods were confirmed by UV–visible spectra. FE-SEM depicted that layered …
Synthesis, Characterization And Nonlinear Optical Properties Of Silver/Pva Nanocomposites, Mahdi Shahmiri
Synthesis, Characterization And Nonlinear Optical Properties Of Silver/Pva Nanocomposites, Mahdi Shahmiri
mahdi shahmiri
Silver/polyvinyl alcohol (PVA) nanocomposites are prepared via quick precipitation method, using hydrazine as a reducing agent. Preparing of silver/PVA nanocomposites by this method is done for the first time. The samples are characterized by Uv-Visible spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM). Nonlinear optical properties are carried out by Z-scan technique using a blue CW laser beam operated at wavelength 405 nm. It is shown that the synthesized samples have negative nonlinear refractive index and the magnitude is in the order of 108. The nonlinear refractive index increases as amount of reducing agent increases.