Influence of Au particles on the photocurrent of TiO2 films
Influence of Au particles on the photocurrent of TiO2 films
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DOI：
10.1007/s10832-006-9925-x
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发表时间：
2006-07
影响因子：
1.7
通讯作者：
Xiaoping Hu;D. Blackwood
中科院分区：
文献类型：
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作者：
Xiaoping Hu;D. Blackwood
利用Au纳米粒子的表面等离子体共振（SPR）效应，将Au/TiO 2复合薄膜用于提高TiO 2薄膜在可见光区的光电转换效率。为了研究Au粒子表面等离子体共振效应与TiO 2薄膜光电流的关系，采用溶胶-凝胶法制备了一系列不同Au浓度的Au/TiO 2薄膜。讨论了Au粒径对TiO 2薄膜晶化、紫外-可见吸收和光电流的影响。结果表明，Au纳米粒子的SPR性能不仅与其粒径有关，还与其在TiO 2基体中的分布有关。即使在Au粒径较大（100 nm）的TiO 2薄膜中，也能观察到可见光区的SPR。然而，这种SPR性能并没有对TiO 2薄膜在可见光区的光电转换做出贡献。结果表明，纳米Au颗粒的嵌入抑制了TiO 2薄膜在紫外区产生的光电流。这种降低的原因被认为部分是由于Au简单地阻挡了一些光，部分是因为TiO 2的结晶程度随着高Au水平而降低。
Au/TiO2composite films were employed in an attempt to improve the photon-electron conversion efficiency of TiO2film in the visible region, using the surface plasma resonance (SPR) of Au nanoparticles. For investigating the relationship between SPR of Au particle and photocurrent of TiO2film, a series of Au/TiO2films with different Au concentrations were synthesized by sol-gel method. Results of studies on the influence of Au particle size on crystallization of TiO2film, UV-vis absorption and photocurrents generated are discussed. It was shown that SPR performance of the Au nanoparticles was not only related to their size, but also to their distribution in the TiO2matrix. Even in TiO2films with large Au particle sizes (100 nm), SPR in visible region was still observed. However, this SPR performance did not contribute to the photon-electron conversion of TiO2film in the visible region. Contrarily, embedded Au nanoparticles depressed the photocurrent generated by the TiO2film in UV region. The reason for this decrease is thought to be partly due to the Au simply blocking some of the light and partly because the extent of crystallization of TiO2decreased with high Au levels.