乙酰丙酮铟钝化CsPbBr_(3)量子点及其室温甲醇气敏性能  

CsPbBr_(3) quantum dots passivated by acetylacetone indium and their room-temperature methanol gas sensitivity

作　　者：黄胜[1] 魏天乐 顾修全[1] 霍雨萌 万耔莘 王艳燕 HUANG Sheng;WEI Tianle;GU Xiuquan;HUO Yumeng;WAN Zixin;WANG Yanyan(School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China;Beijing Narcotics Control Technology Center,Beijing 100164,China)

机构地区：[1]中国矿业大学材料与物理学院,徐州221116 [2]北京市禁毒科技中心,北京100164

出　　处：《复合材料学报》2024年第6期2991-3000,共10页Acta Materiae Compositae Sinica

基　　金：江苏省自然科学基金项目(BK20210494);国家自然科学基金(52303356)。

摘　　要：甲醇气体对人体具有毒性,会损害人的神经系统和血液循环系统,开发能够检测甲醇的器件有十分重要的意义。传感器法检测甲醇具有成本低、灵敏度高且可实时监测的优点,但目前主流的甲醇气体传感器主要以金属氧化物为主,存在工作温度高的缺点。本文通过简单的溶液合成法合成了钙钛矿量子点CsPbBr_(3),并采用乙酰丙酮铟配体(In(Acac)_(3))来对其表面缺陷进行钝化,获得了室温对甲醇具有较好气敏性的材料。在室温下对体积分数为80×10^(-6)甲醇气体相应灵敏度为0.25,响应恢复时间为11.0 s/17.0 s,在紫外光照射下传感器的气体响应性能进一步提高。传感器具有良好的可再现性和稳定性,传感器在体积分数为80×10^(-6)的甲醇浓度下进行多次测试灵敏度均保持在0.25左右,且在15天内均维持在较高水平。同时,在高湿度、无光照等恶劣条件下依然对甲醇有较好的响应。考虑到金属卤化钙钛矿结构可以很容易通过改变元素来调节性质,该研究方法和实验过程可应用到对其他气体的检测。Methanol gas is toxic gas that can harm the human nerve system and blood circulation system.Developing devices capable of detecting methanol gas is of great significance.The use of sensors to detect methanol gas has the advantages of low cost,high sensitivity,and real-time monitoring.However,the mainstream methanol gas sensors mainly rely on metal oxides,which have the drawback of high operating temperatures.Therefore,we synthesized perovskite quantum dots CsPbBr_(3) through a simple solution synthesis method,and passivated their surface defects using an acetylacetone indium ligand(In(Acac)_(3)),obtaining a material with good gas sensitivity to methanol gas at room temperature.The sensitivity to a volume fraction of 80×10^(-6) methanol gas at room temperature is 0.25,and the response/recovery time is 11.0 s/17.0 s,gas sensitivity is further improved under ultraviolet light irradiation.It also has good reproducibility and stability,the sensitivity of the sensor has been maintained at around 0.25 after multiple tests at a volume fraction of 80×10^(-6) methanol gas,and the sensor sensitivity has remained at a high level for 15 days.At the same time,it still has a good response to methanol gas under harsh conditions such as high humidity and no light.Considering that the structure of metal halide perovskite can easily adjust its properties by changing elements,this research method and experimental process can be applied to the detection of other gases.

关 键 词：钙钛矿 气体传感器 甲醇 金属有机化合物 配位改性 

分 类 号：TB332[一般工业技术—材料科学与工程]