Low-Temperature Photocleaning of Sulfur-Poisoned Au Nanoparticles on Titanium Dioxide Film
Low-Temperature Photocleaning of Sulfur-Poisoned Au Nanoparticles on Titanium Dioxide Film
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DOI：
10.1149/1.2164549
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发表时间：
2006-03
影响因子：
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通讯作者：
T. Kiyonaga;T. Kawahara;H. Tada
中科院分区：
文献类型：
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作者：
T. Kiyonaga;T. Kawahara;H. Tada
采用溶胶-凝胶法在玻璃基片上制备了锐钛矿型TiO 2薄膜。采用沉积-沉淀法在TiO 2薄膜（Au/TiO 2 -TF）和TiO 2颗粒（Au/TiO 2 -P）表面制备了纳米金颗粒。Au/TiO 2 -TF吸附Sg分子中的硫的X射线光电子能谱表明，Sg分子中的硫以原子和分子两种化学吸附方式（S-Au/TiO 2 -TF）选择性地吸附在Au表面.在298 K的水中，光照射（λ ex > 300 nm）S-Au/TiO 2 -TF和S-Au/TiO 2 -P后，硫的脱附量基本保持Au的粒径。动力学分析表明，在开放反应体系中，S-Au/TiO 2 -TF的硫解吸速率常数比在封闭反应体系中的S-Au/TiO 2-P的硫解吸速率常数大约1倍。3.6.
Anatase-type TiO 2 films were formed on SiO 2 film-coated glass substrates by a sol-gel method. Nanometer-sized gold particles were highly dispersed on the surfaces of the TiO 2 film (Au/TiO 2 -TF) and TiO 2 particles (Au/TiO 2 -P) using a deposition-precipitation method. X-ray photoelectron spectra of Au/TiO 2 -TF adsorbed with sulfur from Sg molecules indicated that the sulfurs are selectively adsorbed on the Au surfaces with the two kinds of chemisorption modes, atomic and molecular adsorption (S-Au/TiO 2 -TF). Light-irradiation (λ ex > 300 nm) to S-Au/TiO 2 -TF and S-Au/TiO 2 -P in water at 298 K gave rise to desorption of the sulfur with the Au particle size almost maintained. Kinetic analysis showed that the rate constant for the sulfur desorption from S-Au/TiO 2 -TF in an opened reaction system is larger than that from S-Au/TiO 2 P in a closed reaction system by a factor of ca. 3.6.