Improving the photoelectrochemical performance of nanostructured TiO2 films by adsorption of gold nanoparticles
Improving the photoelectrochemical performance of nanostructured TiO2 films by adsorption of gold nanoparticles
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DOI：
10.1021/jp0010029
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发表时间：
2000-11-23
影响因子：
3.3
通讯作者：
Kamat, PV
中科院分区：
文献类型：
--
作者：
Chandrasekharan, N;Kamat, PV
通过从甲苯溶液中吸附金纳米粒子（直径为5 nm）对导电玻璃片上的TiO（2）薄膜进行改性。透射电镜和原子力显微镜观察表明，TiO（2）表面选择性地形成了Au岛和较大的颗粒。虽然吸附的Au颗粒直径较大（50-70 nm），但它们保留了表面等离子体特征，类似于溶液中较小的金纳米颗粒所观察到的特征。用Au纳米粒子修饰TiO（2）薄膜，光电流产生增强了3倍。这种光电化学性能的改善是基于TiO（2）/Au复合膜界面电荷转移动力学的改善。这种半导体-金属复合薄膜在提高光电化学太阳能电池性能方面具有潜在的应用价值。
TiO(2) films cast on conducting glass plates were modified by adsorbing gold nanoparticles (5 nm diameter) from a toluene solution. Selective formation of Au islands and larger particles on the TiO(2) surface could be seen from transmission electron micrographs and AFM images. Although the adsorbed Au particles are larger in diameter (50-70 nm), they retain surface plasmon characteristics, similar to those observed for smaller gold nanoparticles in solutions. A 3-fold enhancement in photocurrent generation has been achieved upon modification of TiO(2) films with Au nanoparticles. This improved photoelectrochemical performance is explained on the basis of improved interfacial charge-transfer kinetics of the TiO(2)/Au composite film. Such semiconductor-metal composite films have potential applications in improving the performance of photoelectrochemical solar cells.