State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China.
College of Mechanical and Electrical Engineering, Hainan University, Haikou, 570228, P. R. China.
Sci Rep. 2017 Jan 24;7:41253. doi: 10.1038/srep41253.
To magnify anatase/rutile phase junction effects through appropriate Au decorations, a facile solution-based approach was developed to synthesize Au/TiO nanoforests with controlled Au locations. The nanoforests cons®isted of anatase nanowires surrounded by radially grown rutile branches, on which Au nanoparticles were deposited with preferred locations controlled by simply altering the order of the fabrication step. The Au-decoration increased the photocatalytic activity under the illumination of either UV or visible light, because of the beneficial effects of either electron trapping or localized surface plasmon resonance (LSPR). Gold nanoparticles located preferably at the interface of anatase/rutile led to a further enhanced photocatalytic activity. The appropriate distributions of Au nanoparticles magnify the beneficial effects arising from the anatase/rutile phase junctions when illuminated by UV light. Under the visible light illumination, the LSPR effect followed by the consecutive electron transfer explains the enhanced photocatalysis. This study provides a facile route to control locations of gold nanoparticles in one-dimensional nanostructured arrays of multiple-phases semiconductors for achieving a further increased photocatalytic activity.
为了通过适当的 Au 修饰放大锐钛矿/金红石相界效应，我们开发了一种简便的基于溶液的方法，用于合成具有受控 Au 位置的 Au/TiO 纳米森林。这些纳米森林由锐钛矿纳米线组成，周围生长着金红石支链，Au 纳米颗粒通过简单改变制备步骤的顺序来沉积，并且可以控制其优先位置。Au 修饰提高了在紫外光或可见光照射下的光催化活性，这是由于电子捕获或局域表面等离子体共振（LSPR）的有利影响。Au 纳米颗粒优先位于锐钛矿/金红石界面处，进一步提高了光催化活性。Au 纳米颗粒的适当分布在紫外光照射下放大了由锐钛矿/金红石相界产生的有利影响。在可见光照射下，LSPR 效应随后的连续电子转移解释了增强的光催化作用。本研究为在多相半导体的一维纳米结构阵列中控制金纳米颗粒的位置提供了一种简便的途径，以实现进一步提高的光催化活性。
