TiO $_2$表面去湿金纳米粒子--尺寸无关等离子体光电化学响应的证据
Dewetted Au nanoparticles on TiO$_2$ surfaces -- Evidence of a size-independent plasmonic photo-electrochemical response
摘要：
采用磁控溅射法在Ti/Si基片上制备了TiO $_2$薄膜。TiO $_2$表面然后用标称厚度为0.5-10 nm的薄Au膜涂覆，所述Au膜通过固态去湿转化为可调节尺寸和间距的Au纳米颗粒; Au纳米颗粒尺寸可以在宽范围内调节，即约10 nm。3-200 nm。Au修饰的TiO $_2$表面能够在可见光照射（450-750 nm）下进行等离子体光电化学水裂解。水分解性能达到最大的TiO $_2$层装饰有~ 30 nm大小的Au颗粒。正如预期的那样，光学吸收测量显示随着Au纳米颗粒尺寸的增加等离子体消光带的红移。然而，等离子体激元光电流被发现在~ 600 nm处达到峰值，而与Au纳米颗粒的尺寸无关，即等离子体激元光电流带位置与尺寸无关。这种显著的观察结果可以归因于热电子注入截止效应。
英文摘要：
Flat TiO$_2$ layers are deposited by magnetron sputtering on Ti/Si wafers. The TiO$_2$ surfaces are then sputter-coated with thin Au films of a nominal thickness of 0.5-10 nm that are converted by solid-state dewetting into Au nanoparticles of tuneable size and spacing; the Au nanoparticle size can be tuned over a broad range, i.e. ca. 3-200 nm. The Au-decorated TiO$_2$ surfaces enable plasmonic photo-electrochemical water splitting under visible light illumination (450-750 nm). The water splitting performance reaches a maximum for TiO$_2$ layers decorated with ~ 30 nm-sized Au particles. As expected, optical absorption measurements show a red shift of the plasmonic extinction band with increasing the Au nanoparticle size. However, the plasmonic photocurrent is found to peak at ~ 600 nm regardless of the size of the Au nanoparticles, i.e. the plasmonic photocurrent band position is size-independent. Such a remarkable observation can be ascribed to a hot electron injection cut-off effect.
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