Light enhanced room temperature resistive NO2 sensor based on a gold-loaded organic-inorganic hybrid perovskite incorporating tin dioxide
Light enhanced room temperature resistive NO2 sensor based on a gold-loaded organic-inorganic hybrid perovskite incorporating tin dioxide
复制标题
基于含有二氧化锡的载金有机-无机杂化钙钛矿的光增强型室温电阻式 NO2 传感器
DOI：
10.1007/s00604-018-3155-1
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发表时间：
2019
影响因子：
5.7
通讯作者：
Xu Jiaqiang
中科院分区：
文献类型：
--
作者：
Chen Yilu;Zhang Xinyu;Liu Zhifu;Zeng Zhigang;Zhao Hongbin;Wang Xiaohong;Xu Jiaqiang
描述了一种用于感测气相中的NO 2的材料。它具有类型Au/MASnI 3/SnO 2（其中MA代表甲基铵阳离子）的结构，并且通过首先合成Au/MASnI 3，然后通过煅烧在表面上结晶SnO 2来制备。研究了复合材料的物理性能和NO2气敏性能，并对NO2气敏机理进行了探讨。表征结果表明，在p-MASnI 3和n-SnO 2之间形成了p-n异质结结构。该传感器在室温下最佳工作电压为1.1 V，显示出上级NO2传感性能。优点包括：（a）反应迅速（对于5 ppm NO2，Rg/Ra= 240;其中Rg表示传感器在测试气体中的电阻，Ra表示传感器在空气中的电阻），（B）快速恢复（约12 s），（c）与基于仅使用SnO 2或Au/SnO 2的传感器相比，具有优异的选择性，两者均在室温下在UV照射下;（d）低检测限（55 ppb），和（e）NO2在0.5和10 ppm之间的线性响应。这种增强的传感性能主要归因于MASnI 3的高的光吸收能力、MASnI 3的光生电子容易从MASnI 3产生并转移到SnO 2的导带以及金纳米颗粒的催化作用。图形摘要金功能化的MASnI 3/SnO 2系统在与UV照射平衡后的能带图示意图，由此可以解释对NO2的增强的传感性能。
A material is described for sensing NO2in the gas phase. It has an architecture of type Au/MASnI3/SnO2(where MA stands for methylammonium cation) and was fabricated by first synthesizing Au/MASnI3and then crystallizing SnO2on the surface by calcination. The physical and NO2sensing properties of the composite were examined at room temperature without and with UV (365 nm) illumination, and the NO2-sensing mechanism was studied. The characterization demonstrated the formation of a p-n heterojunction structure between p-MASnI3and n-SnO2. The sensor, best operated at a voltage of 1.1 V at room temperature, displays superior NO2sensing performance. Figures of merit include (a) high response (Rg/Ra= 240 for 5 ppm NO2; where Rgstands for the resistance of a sensor in test gas, and Rastands for the resistance of a sensor in air), (b) fast recovery (about 12 s), (c) excellent selectivity compared to sensors based on the use of SnO2or Au/SnO2only, both at room temperature under UV illumination; (d) a low detection limit (55 ppb), and (e) a linear response between 0.5 and 10 ppm of NO2. The enhanced sensing performance is mainly attributed to the high light absorption capacity of MASnI3, the easy generation and transfer of photo-induced electrons from MASnI3to the conduction band of SnO2, and the catalytic effect of gold nanoparticles.Graphical abstractSchematic of the energy band diagrams of the gold-functionalized MASnI3/SnO2system after equilibrium with UV illumination, by which the enhanced sensing performance for NO2can be explained.