Optical And Structural Characterization of Non Linear…R

ABSTRACT Organic non linear optical crystal of Glycine Thiourea (GTU) was grown successfully by slow evaporation solution growth technique. The powder X-ray diffraction (PXRD) confirms that it crystallizes in orthorhombic crystal system with space group Pnma. The UV-Visible transmittance spectrum shows that the crystal has a good optical transmittance in the entire visible region with lower cut off wavelength 271 nm. The existence of second harmonic generation signal was evidenced using Kurtz Perry powder test and the efficiency of the crystal was found to be 1.11 times that of the standard KDP crystal. The morphological structure of GTU crystal was found by SEM analysis. The presence of elements within the compound was determined by EDAX studies

Cow dung extract as a low-cost and natural sensitizer for zinc oxide nanoparticles photoanode based dye-sensitized solar cell: A novel initiative for waste to energy conversion

Cow dung extracts are prepared using ethanol and methanol as solvents. Electronic absorption spectra of cow dung extracts have exhibited wide absorption in the UV and visible region between 300 and 730 nm. The absorption of cow dung extracts showed variations in intensity and absorption peaks at different wavelengths, which can be attributed to presence of diverse photosynthetic pigments corresponding to polarity of applied solvents. The observed pigments of chlorophyll a, chlorophyll b and carotenoids in the cow dung extracts can be ascribed to the feeding behavior of the cow. The FTIR and UV–vis absorption results have disclosed that the sensitization of zinc oxide nanoparticles (ZnO NPs) photoanode is mainly due to the chlorophylls present in the cow dung extract. The methyl group in the chlorophyll molecules from ideal bond with ZnO NPs that enables transfer of electrons from chlorophyll molecules to conduction band of ZnO NPs. The solar cells sensitized with cow dung extract in methanol has delivered highest energy conversion efficiency of 0.102%, which can be ascribed to presence of relatively a greater number of photosynthetic pigments