Abstract In this work, We have successfully grown the crystalline Tin Oxide (SnO 2 ) 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 SnO 2 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 A 1g mode of SnO 2 . The intensity of A 1g mode increased with growth temperature supporting the XRD results that the crystal structure of grown SnO 2 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.

中文翻译：

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生长温度对无催化剂水热合成结晶二氧化锡微片的影响

摘要 在这项工作中，我们在不使用任何催化剂的情况下，通过水热技术成功地生长了结晶氧化锡（SnO 2 ）微片。我们还能够通过调节生长温度来控制生长片的厚度，并首次报道了最厚的微片（5 µm 厚）。X 射线衍射 (XRD) 研究证实了生长的 SnO 2 的四方晶体结构，并且发现随着合成温度从 50 °C 增加到 250 °C，粒径从 2 nm 增加到 15 nm。SEM 图像显示合成样品的微片状形态和片材的厚度分别从 1.4 增加到 5.1 ± 0.01 µm，随着生长温度从 150°C 增加到 250°C。拉曼光谱测量显示在 639 cm -1 处的主峰与 SnO 2 的 A 1g 模式有关。A 1g 模式的强度随着生长温度的增加而增加，支持XRD结果，生长的SnO 2 片的晶体结构随着生长温度的增加而改善。此外，根据拉曼数据计算的结晶度在 250 °C 的生长温度下增加到 68%。UV-Visible 数据分析表明，温度从 150 ℃ 升高到 250 ℃ 导致光吸收边分别从 280 到 290 nm 偏移。