Abstract

A principle of obtaining macroporous Ag@TiO₂ thin films by a template-free method in the frame work of sol–gel is developed. The macroporous structure is constructed by photo polymerization induced phase separation (PIPS) method, and the reduction of Ag⁺ to Ag⁰ is induced by ultraviolet irradiation at the same time. The achieved macroporous Ag@TiO₂ films are well interconnected and crack free with an average pore size in the range 350–440 nm. Increasing Ag concentration results in the enhancement of extinction coefficient and reduction of refractive index, which are found to be consistent with absorbance and transmittance observations. In addition, Ag concentration causes red shift in absorbance which in turn decreases the band gap energy. These results may add important insight into developing high-performance materials for visible light activities.

中文翻译：

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一步法溶胶-凝胶法制备大孔Ag @ TiO 2薄膜的结构和光学性质

抽象的

提出了在溶胶-凝胶框架中通过无模板法获得大孔Ag @ TiO ₂薄膜的原理。通过光聚合诱导相分离（PIPS）方法构建大孔结构，并且同时通过紫外线照射诱导Ag ⁺还原为Ag ⁰。获得的大孔Ag @ TiO ₂薄膜相互连接良好，无裂纹，平均孔径在350-440 nm范围内。Ag浓度的增加会导致消光系数的增加和折射率的降低，这与吸光度和透射率观察结果一致。另外，Ag浓度引起吸光度红移，这反过来又降低了带隙能量。这些结果可能为开发用于可见光活动的高性能材料提供重要的见识。