Effect of growth temperature on catalyst free hydrothermal synthesis of crystalline SnO2 micro-sheets
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In this work, We have successfully grown the crystalline Tin Oxide (SnO2) micro-sheets by hydrothermal technique without using any catalyst. We also able to controlled the thickness of grown sheets by modulating the growth temperature and have reported the thickest micro-sheets (5 µm thick) for the first time. X-ray diffraction (XRD) studies confirm the tetragonal crystalline structure of grown SnO2 and particle size was found to be increased from 2 to 15 nm as the synthesis temperature increased from 50 to 250 °C. SEM images have shown the micro-sheets like morphology of synthesized samples and the thickness of sheets increased from 1.4 to 5.1 ± 0.01 µm as the growth temperature increased from 150 to 250 °C respectively. Raman spectroscopy measurements showed a dominant peak at 639 cm−1 which is related to A1g mode of SnO2. The intensity of A1g mode increased with growth temperature supporting the XRD results that the crystal structure of grown SnO2 sheets improved with increasing growth temperature. Furthermore, the degree of crystanality, calculated from Raman data, increased to 68% at growth temperature 250 °C. The analysis of UV–Visible data demonstrated that increasing temperature from 150 ℃ to 250 ℃ causes the shift in the optical absorption edge from 280 to 290 nm respectively.