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Highly Sensitive NO2 Response and Abnormal P-N Sensing Transition with Ultrathin Mo-Doped SnS2 Nanosheets
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2020-10-30 , DOI: 10.1016/j.cej.2020.127572
Jianhong Zhou , Ke Xue , Yaoda Liu , Tingting Liang , Pengfei Zhang , Xu Zhang , Wentao Zhang , Zhengfei Dai

Sensing of Nitrogen dioxide (NO2) is of great importance for its pernicious and destructive impacts to both human health and nature environment. However, it still remains challenging to achieve the NO2 detection with fast response, high sensitivity and good selectivity. In this work, two-dimensional (2D) ultrathin n-type SnS2 nanosheets with Mo doping have been synthesized via a simple single-step solvothermal method and exploited for NO2 sensing application. Phase and structural analyses confirm the homogeneous cation alloying of Mo (1% ∼ 10%) in the SnS2. It is indicated that the Mo doping can elegantly tune the electronic structure of SnS2 and promote the sensing process with negative adsorption energy. Especially for 3%Mo-SnS2 nanosheet, the NO2 sensing response at 150 ℃ has been enhanced around 23 times relative to the un-doped SnS2 sample, together with fast sensing kinetics and good NO2 selectivity. Interestingly, the n-type SnS2-based sensor shows an abnormal response characteristic for the first time with resistance decrease at low NO2 concentration, behaving like a p-type semiconductor. The P-N sensing transition can be regulated by varying the operation temperature and NO2 concentration. Mechanisms for the enhanced sensing and abnormal phenomena are well explained based on density function theory calculations. Such P-N sensing switch in a single sensor here opens up interesting possibilities for the highly sensitive and selective detection of NO2 with 2D metal dichalcogenides.



中文翻译:

高灵敏NO 2的响应和异常PN传感过渡与超薄掺Mo的SnS 2纳米片

二氧化氮(NO 2)的传感对其对人类健康和自然环境的有害和破坏性影响非常重要。然而,以快速响应,高灵敏度和良好的选择性来实现NO 2检测仍然具有挑战性。在这项工作中,已通过简单的单步溶剂热法合成了二维(2D)超薄n型SnS 2纳米片,并带有Mo掺杂,并将其用于NO 2传感应用。相和结构分析证实了SnS 2中Mo(1%〜10%)的均匀阳离子合金化。结果表明,Mo掺杂可以很好地调节SnS 2的电子结构。并以负的吸附能促进传感过程。特别是对于3%Mo-SnS 2纳米片,与未掺杂的SnS 2样品相比,在150℃下的NO 2感测响应提高了约23倍,并且具有快速的感测动力学和良好的NO 2选择性。有趣的是,基于n型SnS 2的传感器首次表现出异常响应特性,并且在低NO 2浓度下电阻降低,表现得像p型半导体。PN感应转换可通过改变工作温度和NO 2来调节浓度。基于密度函数理论计算,很好地解释了增强感测和异常现象的机制。单个传感器中的这种PN感测开关在此为使用2D金属二卤化物进行NO 2的高灵敏度和选择性检测提供了有趣的可能性。

更新日期:2020-11-02
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