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oe1(光电查) - 科学论文

2 条数据
?? 中文（中国） ▾

  • Layer-by-layer self-assembly of polyaniline nanofibers/TiO2 nanotubes heterojunction thin film for ammonia detection at room temperature

    摘要： 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 PANI 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.

    关键词： Ammonia detection,Layer-by-layer self-assembly,Polyaniline/TiO2 heterojunction,Thin film,Room temperature operation

    更新于2025-09-23 15:23:52

  • Ammonia Sensing Characteristics of a Tungsten Trioxide Thin-Film-Based Sensor

    摘要： A tungsten trioxide (WO3) thin-film-based ammonia sensor device prepared using radio frequency sputtering is reported and studied. A very thin WO3 film (~10 nm) is employed in the studied device. Experimentally, the studied device exhibits a high ammonia sensing response of 13.7 (at 1000-ppm NH3/air, 250 °C), an extremely low detection level (≤10-ppb NH3/air, 250 °C), a relatively low optimal operating temperature of 250 °C, and a widespread sensing concentration range. Furthermore, the device shows advantages including a simple structure, easy fabrication, and relatively lower operating temperature (≤250 °C). Thus, the proposed WO3 thin-film-based sensor device is promising for high-performance ammonia sensing applications.

    关键词： Ammonia,detection level,semiconducting metal oxide (SMO),sensing response,tungsten trioxide (WO3),sputtering

    更新于2025-09-09 09:28:46