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Open Access Highly Accessed Nano Express

Two novel hierarchical homogeneous nanoarchitectures of TiO2 nanorods branched and P25-coated TiO2 nanotube arrays and their photocurrent performances

Anzheng Hu12, Cuixia Cheng1, Xin Li1, Jian Jiang1, Ruimin Ding1, Jianhui Zhu1, Fei Wu1, Jinping Liu1 and Xintang Huang1*

Author Affiliations

1 Institute of Nanoscience and Nanotechnology, Central China Normal University, Wuhan 430079, P. R. China

2 School of Physics and Electronic Engineering, Xiangfan University, Xiangfan 441053, Hubei, P. R. China

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Nanoscale Research Letters 2011, 6:91  doi:10.1186/1556-276X-6-91

Published: 18 January 2011

Abstract

We report here for the first time the synthesis of two novel hierarchical homogeneous nanoarchitectures of TiO2 nanorods branched TiO2 nanotube arrays (BTs) and P25-coated TiO2 nanotube arrays (PCTs) using two-step method including electrochemical anodization and hydrothermal modification process. Then the photocurrent densities versus applied potentials of BTs, PCTs, and pure TiO2 nanotube arrays (TNTAs) were investigated as well. Interestingly, at -0.11 V and under the same illumination condition, the photocurrent densities of BTs and PCTs show more than 1.5 and 1 times higher than that of pure TNTAs, respectively, which can be mainly attributed to significant improvement of the light-absorbing and charge-harvesting efficiency resulting from both larger and rougher surface areas of BTs and PCTs. Furthermore, these dramatic improvements suggest that BTs and PCTs will achieve better photoelectric conversion efficiency and become the promising candidates for applications in DSSCs, sensors, and photocatalysis.