文献类型：期刊文献

英文题名：Ni-doped TiO2 nanotubes for wide-range hydrogen sensing

作者：Li, Zhaohui[1];Ding, Dongyan[1];Liu, Qiang[1];Ning, Congqin[2];Wang, Xuewu[3]

机构：[1]Shanghai Jiao Tong Univ, Inst Microelect Mat & Technol, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China;[3]E China Univ Sci & Technol, Sch Informat Sci & Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：9

期号：1

外文期刊名：NANOSCALE RESEARCH LETTERS

收录：;EI(收录号：20151800798194);WOS:【SCI-EXPANDED(收录号:WOS:000347634300003)】；

基金：This work was supported by Shanghai Pujiang Program (No. 07pj14047). We thank the contribution from SEM lab at Instrumental Analysis Center of SJTU.

语种：英文

外文关键词：TiO2 Nanotubes; Ni doping; Hydrogen sensor; First-principles calculations

摘要：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% H-2. A temperature-dependent sensing from 25 degrees C to 200 degrees 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.