Institute of Microelectronic Materials and Technology, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Nanoscale Res Lett. 2014 Mar 13;9(1):118. doi: 10.1186/1556-276X-9-118.
Doping of titania nanotubes is one of the efficient way to obtain improved physical and chemical properties. Through electrochemical anodization and annealing treatment, Ni-doped TiO2 nanotube arrays were fabricated and their hydrogen sensing performance was investigated. The nanotube sensor demonstrated a good sensitivity for wide-range detection of both dilute and high-concentration hydrogen atmospheres ranging from 50 ppm to 2% H2. A temperature-dependent sensing from 25°C to 200°C was also found. Based on the experimental measurements and first-principles calculations, the electronic structure and hydrogen sensing properties of the Ni-doped TiO2 with an anatase structure were also investigated. It reveals that Ni substitution of the Ti sites could induce significant inversion of the conductivity type and effective reduction of the bandgap of anatase oxide. The calculations also reveal that the resistance change for Ni-doped anatase TiO2 with/without hydrogen absorption was closely related to the bandgap especially the Ni-induced impurity level.
掺杂二氧化钛纳米管是获得改善的物理和化学性质的有效方法之一。通过电化学阳极氧化和退火处理，制备了掺镍的 TiO2 纳米管阵列，并研究了它们的氢气传感性能。纳米管传感器对从 50ppm 到 2%H2 的宽浓度范围的稀释和高浓度氢气气氛具有良好的灵敏度。还发现了从 25°C 到 200°C 的温度相关传感。基于实验测量和第一性原理计算，还研究了具有锐钛矿结构的掺镍 TiO2 的电子结构和氢气传感性能。结果表明，Ti 位的 Ni 取代可以诱导导电性类型的显著反转和锐钛矿氧化物能带隙的有效降低。计算还表明，对于具有/不具有氢气吸收的掺镍锐钛矿 TiO2，电阻变化与能带隙特别是 Ni 诱导的杂质能级密切相关。
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