A hybrid material consisting of bulk-reduced TiO<sub class="a-plus-plus">2sub>, graphene oxide and polyaniline for resistance based sensing of gaseous ammonia at room temperature

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• 作者：Junfeng Tian ; Guang Yang ; Denggao Jiang ; Fangfang Su ; Zhihong Zhang
• 关键词：Composite material ; Rutile ; Resistivity ; Photoluminescence ; Surface defects
• 刊名：Microchimica Acta
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：183
• 期：11
• 页码：2871-2878
• 全文大小：1,385 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Inorganic Chemistry
  Physical Chemistry
  Characterization and Evaluation Materials
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Wien
• ISSN：1436-5073
• 卷排序：183

文摘

A hybrid material consisting of bulk-reduced TiO<sub>2sub>, graphene oxide (GO) and polyaniline (PANI) was fabricated by decorating TiO<sub>2sub> with GO, followed by in-situ oxidative chemical polymerization of aniline. The TiO<sub>2sub> nanoparticles (NPs) with thermally stable bulk reduction states were initially prepared from porous amorphous titanium as the precursor. The TiO<sub>2sub> NPs and GO were chemically conjugated to each other via amide bonds to improve the stability of the composite. The sensor, if operated in the conductivity mode, exhibits strong signal changes, and fast response and recovery times (of 32 and 17 s, respectively) to gaseous ammonia even at room temperature. Its response range extends from 5 to 300 ppm, and the lower detection limit is 5 ppm. The sensor is fairly selective and not interfered by gases such as CO, CH<sub>4sub>, and trimethylamine, and by vapors of methanol and ethanol. It also displays good temporal stability. This is attributed to the bulk-reduced state of TiO<sub>2sub>, the presence of oxygen functional groups on GO, and the strong adsorption and rapid diffusion of ammonia. The results also imply the presence of a synergetic effect between TiO<sub>2sub> and GO/PANI, which is probably beneficial for the potential application of the resulting composite as a gas sensor.