Conductometric room temperature ammonia sensors based on titanium dioxide nanoparticles decorated thin black phosphorus nanosheets

文献类型： 外文期刊

第一作者： Wang, Yanjie

作者： Wang, Yanjie;Zhou, Yong;Wang, Yuhang;Zhang, Ruijie;Li, Jing;Zang, Zhigang;Li, Xian

作者机构：

关键词： Gas Sensor; Ammonia; Black phosphorus; Titanium dioxide; Nanocomposites film; Room temperature

期刊名称：SENSORS AND ACTUATORS B-CHEMICAL （ 影响因子：9.221； 五年影响因子：7.676 ）

ISSN：

年卷期： 2021 年 349 卷

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收录情况： SCI

摘要： Ammonia gas (NH3) as a harmful and toxic gas species severely threatens ecological harmony and human health, thus necessitating its sensitive detection at very low dose. In this regard, two-dimensional (2D) nanomaterials have been extensively harnessed as the sensing layers due to the unique merits of large surface area, intriguing layer-dependent electrical behaviors and versatile modifications. Of these 2D candidates, black phosphorus (BP) as a rising representative has attracted considerable attention, whereas undesirably hindered by sluggish response/recovery kinetics and fragile stability. To circumvent these obstacles, we employed titanium dioxide (TiO2) nanoparticles decorated BP nanosheets as the sensing layer to selectively discern 0.5-30 ppm NH3 at room temperature (18 +/- 2 degrees C) for the first time. The constituent ratio-optimized BP-TiO2 sensors exhibited higher response, less baseline drift, shorter response/recovery times, and stronger long-term stability when compared with pure BP counterparts. Enlarged specific surface area, numerous p-n BP-TiO2 heterojunctions and TiO2 nanoparticles involved passivation were primarily responsible for these improvements. In summary, the proposed composite sensors have expanded BP-related gas sensing to NH3 gas for the first time in the experimental perspective simultaneously enriching feasible strategies to improve the operation stability of BP nanosheets.

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