Nonlinear optical single crystals of L-cysteine hydrochloride monohydrate (LCB) were grown by slow evaporation technique. Single crystal X-ray diraction analysis revealed the crystal system and helped to determine lattice parameter values. Powder X-ray diraction analyses were carried out and the diraction patterns were indexed. The optical properties of the crystals were determined using UV-visible spectroscopy. Optical constants such as refractive index, extinction coecient and electric susceptibility were determined from UV-visible spectroscopy. The Fourier transform infrared studies conrmed the various functional groups present in the grown crystal. The mechanical behaviour of the grown crystals was studied using Vicker's microhardness tester. The thermal analysis conrmed that the crystal was stable up to 108.7• C. The dielectric constant and the dielectric loss measurements were carried out for dierent temperatures and frequencies. Second harmonic generation of LCB crystal was investigated by the Kurtz powder technique.
Cu 2+ -doped TiO2 nanoclusters are prepared by the sol-gel method. Scanning electron microscopy and Xray diffractometry are applied to characterize their structural properties. The photocatalytic analysis is done by UV-Vis absorption spectrum. The results of X-ray diffraction (XRD) shows the presence of rutile peak with a strong orientation along (1 1 0) plane. Scanning electron microscopy (SEM) study shows the uniform distribution of agglomerated nanoclusters. EDS spectrum confirms the presence of doped metal ion Cu 2+ in the TiO2 crystal lattices. In this work, the photocatalytic effect of Cu 2+ -doped TiO2 on the degradation of methyl orange dye is studied. TiO2 doped with 5 wt% Cu 2+ gives an excellent result in the degradation of methyl orange.
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