Talebi Razieh
Department of Physics, University of Isfahan, 81746-73441, Isfahan, Iran.
Phys Chem Chem Phys. 2018 Feb 21;20(8):5734-5743. doi: 10.1039/c7cp07923k.
Multicolour photochromic behaviour in light-sensitive Ag-AgCl and Ag-AgI thin films at room temperature was investigated and compared. Although it seemed that the Ag-Ag halide thin films have similar optical properties, their optical responses to a monochromatic laser beam are completely different. It is shown that Ag-AgCl thin film changes its colour under light irradiation to the same colour of the incident light, regardless of the polarization state of the laser beam. In contrast, the Ag-AgI thin film changes to complementary colours of the incident beam. The different optical behaviours of Ag-AgCl and Ag-AgI thin films are due to the different electrical properties of AgCl and AgI thin films. Moreover, the multicolour photochromic behaviour is due to the changes of absorption spectra and surface morphology of silver nanoparticles on silver-haide thin film. These changes are the result of excitation of localized surface plasmon resonance of silver nanoparticles by the laser beam and charge transfer between silver nanoparticles and silver-halide thin films.
研究并比较了室温下光敏Ag-AgCl和Ag-AgI薄膜的多色光致变色行为。尽管Ag-Ag卤化物薄膜似乎具有相似的光学性质，但它们对单色激光束的光学响应却完全不同。结果表明，Ag-AgCl薄膜在光照射下会变成与入射光相同的颜色，而与激光束的偏振状态无关。相比之下，Ag-AgI薄膜会变成入射光束的互补色。Ag-AgCl和Ag-AgI薄膜不同的光学行为是由于AgCl和AgI薄膜不同的电学性质。此外，多色光致变色行为是由于卤化银薄膜上银纳米颗粒的吸收光谱和表面形态的变化。这些变化是激光束激发银纳米颗粒的局域表面等离子体共振以及银纳米颗粒与卤化银薄膜之间电荷转移的结果。
