Lai Chin Wei, Sreekantan Srimala
School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia Engineering Campus, 14300 Nibong Tebal, Seberang Perai Selatan, Pulau Pinang, Malaysia.
J Nanosci Nanotechnol. 2012 Apr;12(4):3170-4. doi: 10.1166/jnn.2012.5874.
Well aligned TiO2 nanotubes were successfully synthesized by anodization of Ti foil at 60 V in a fluorinated bath comprised of ethylene glycol with 5 wt% of NH4F and 5 wt% of H2O2. In order to enhance the visible light absorption and photoelectrochemical response of pure TiO2 nanotube arrays, a mixed oxide system (W-TiO2) was investigated. W-TiO2 nanotube arrays were prepared using radio-frequency (RF) sputtering to incorporate the W into the lattice of TiO2 nanotube arrays. The W atoms occupy the substitutional position within the vacancies of TiO2 nanotube arrays. The as-anodized TiO2 is amorphous in nature while the annealed TiO2 is anatase phase. The mixed oxide (W-TiO2) system in suitable TiO2 phase plays important roles in efficient electron transfers due to the reduction in electron-hole recombination. In this article, the effect of the sputtered W into the as-anodized/annealed TiO2 nanotube arrays on the photoelectrochemical response was presented.
通过在由含有5 wt% NH4F和5 wt% H2O2的乙二醇组成的氟化浴中，于60 V电压下对钛箔进行阳极氧化，成功合成了排列良好的TiO2纳米管。为了增强纯TiO2纳米管阵列的可见光吸收和光电化学响应，研究了一种混合氧化物体系（W-TiO2）。采用射频（RF）溅射法将W掺入TiO2纳米管阵列的晶格中，制备了W-TiO2纳米管阵列。W原子占据TiO2纳米管阵列空位内的替代位置。阳极氧化后的TiO2本质上是无定形的，而退火后的TiO2是锐钛矿相。由于电子-空穴复合的减少，处于合适TiO2相的混合氧化物（W-TiO2）体系在有效的电子转移中起着重要作用。本文介绍了溅射W到阳极氧化/退火后的TiO2纳米管阵列中对光电化学响应的影响。
