期刊
NANOTECHNOLOGY
卷 30, 期 13, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aafc7e
关键词
ammonia detection; layer-by-layer self-assembly; polyaniline/TiO2; heterojunction; room temperature operation; thin film
资金
- Natural Science Foundation of China [41330313]
- Taishan Scholar Foundation [ts20130929]
- Fundamental Research Funds for the Central Universities [15CX08009A, 17CX06046]
In this paper, for the first time, polyaniline nanofibers/TiO2 nanotubes (PANI/TiO2) heterojunction thin film has been prepared on Pt interdigital electrodes by layer-by-layer self-assembly method and applied in room temperature NH3 detection. It is found that the optimal self-assembly layer number is three (PANI/TiO2-3) compared to one layer (PANI/TiO2-1) and five layers (PANI/TiO2-5). The PANI/TiO2-3 thin film sensor possesses superior response characteristics compared with our other PANT based sensors, including higher response value (336% @5 ppm NH3), acceptable response/recovery time (110 s/1086 s@5 ppm NH3), low detection limit (0.5 ppm), and remarkable selectivity. The enhanced gas sensing performances could be ascribed to the tremendous variation of the carrier concentration caused by the p-n junctions as well as the increased specific surface area and pore volume. This work not only offers a superb strategy to fabricate heterojunction thin film but also accelerates the development of room-temperature operable NH3 sensors.
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