The effect of gamma-rays on structural, optical and photocatalytic properties of TiO₂ nanoparticles under controlled atmospheres are studied to further improve photocatalytic performance. The sol–gel TiO₂ powders were deposited with spin-coating technique, annealed at 500°C then finally irradiated by gamma-rays. The structural and optical characteristics of samples were investigated by Fourier transform infrared spectroscopy, x-ray diffraction and UV-visible spectroscopy (UV). The time-dependent density functional theory (TD-DFT) calculation are used to determine ground geometries and electronic structures of TiO₂ nanostructures. DFT calculations present an excellent conformity with experimental results, and a high anisotropy in stretched thermal and electrical conductivity TiO₂ nanostructures was found. Structural and optical results show that gamma radiation did not change the crystallinity of TiO₂ nanostructures and leads to an optical band gap reduction to 3.039 eV. The gamma radiation effect on photocatalytic performance was investigated by methylene blue degradation as a typical pollutant. Gamma radiation has been discovered to improve considerably the degradation of pollutants compared with unirradiated TiO₂.

中文翻译：

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受控气氛下γ射线辐照对TiO 2纳米颗粒结构，光学和光催化性能的影响

研究了γ射线对受控气氛下TiO ₂纳米粒子的结构，光学和光催化性能的影响，以进一步提高光催化性能。溶胶-凝胶TiO ₂粉末采用旋涂技术沉积，在500°C退火，然后最终用伽马射线辐照。通过傅里叶变换红外光谱，X射线衍射和紫外可见光谱（UV）研究了样品的结构和光学特性。随时间变化的密度泛函理论（TD-DFT）计算用于确定TiO _2的地面几何形状和电子结构纳米结构。DFT计算显示出与实验结果的极佳一致性，并且在拉伸的热导率和电导率TiO ₂纳米结构中发现了高各向异性。结构和光学结果表明，伽马辐射不会改变TiO ₂纳米结构的结晶度，并导致光学带隙减小至3.039 eV。通过亚甲基蓝降解作为典型污染物研究了γ射线对光催化性能的影响。与未辐照的TiO ₂相比，已发现伽马辐照可显着改善污染物的降解。