γ-glycine (GG) was synthesized from α-glycine in an aqueous solution of strontium chloride. A solubility study of the synthesized GG sample was conducted at various temperatures ranging from 30 to 55 °C. The saturated solution of GG was prepared using solubility data, and single crystals of GG were grown over a period of three weeks by the slow evaporation method at room temperature. The grown GG crystals were characterized by single-crystal x-ray diffraction analysis, UV–visible transmittance studies, thermogravimetric/differential thermal analysis studies, dielectric studies and Fourier transform infrared studies. The mechanical behavior of the crystals was assessed by Vickers microhardness measurements. The second-harmonic generation efficiency of the sample was measured using a Nd:YAG laser and the value was observed to be larger than that of potassium dihydrogen orthophosphate (KDP).
A simple, inexpensive and environmental friendly co-precipitation approach has been used to synthesize
calcium doped SnO2 photocatalysts effectively with a high surface area. The X-ray diffraction (XRD),
scanning electron microscopy (SEM), Raman spectroscopy, Fourier transform infrared (FTIR),
ultraviolet-visible (UV-Vis) and photoluminescence (PL) spectroscopies all have been used to
characterize the structural, morphological, optical and electrochemical properties of the prepared
SnO2:Ca nanoparticles. Both crystallized SnO2 and SnO2:Ca nanoparticles have tetragonal geometry.
The structure and defects of the prepared sample were verified by the Raman spectra. The redshift in
optical investigations confirmed the reduction in the optical band gap with increasing Ca content. The
photocatalytic decomposition of methylene blue were also carried out using prepared SnO2:Ca
nanoparticles in visible light. In particular, when compared to other samples, the SnO2:Ca (7 wt.%)
nanoplates show the best photocatalytic activity which is confirmed from the low photoluminescence
spectrum. By evenly dispersing Ca atoms across the SnO2 matrix, the band gap may be significantly
lowered, allowing for more effective separation of photogenerated electron-hole pairs and, in turn,
more visible-light absorption. The charge separation efficacy of SnO2:Ca (7 wt.%) nanoplates has
been confirmed by EIS measurements.
In this work, two-dimensional hexagonal nanoplatelets were analyzed through a simple morphological and structural evolutions. XRD analysis of SnO 2 and Y doped SnO 2 has revealed a tetragonal structure and photoluminescence spectra exhibited a visible emission broadband peak around 464 nm and 528 nm. SnO 2 : Y (7 wt.%) photoluminescence spectra con rm the higher charge separation and which impede the electron-hole recombination. It has been shown that hexagonal SnO 2 :Y (7 wt.%) nanoplatelets perform better in photocatalytic degradation than conventional spherical nanoparticles. EIS measurements were performed to investigate the charge carrier movement of both undoped and Y doped SnO 2 NPs. Our study is the rst to illustrate the two-dimensional morphology of SnO 2 :Y (7 wt.%) hexagonal nanoplatelets and their application integration of photocatalytic materials.
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