Preparation of CsPbBr3 @Fe2O3 heterojunction nanocrystals for ppb-level H2 S sensing

被引：4

作者：

Huang, Sheng ^{[1
]}

Shan, Husheng ^{[1
]}

Xu, Yafei ^{[1
]}

Zuo, Jia ^{[2
]}

Zhao, Yulong ^{[1
]}

Gu, Xiuquan ^{[1
,3
]}

机构：

[1] China Univ Min & Technol, Sch Mat Sci & Phys, Xuzhou 221116, Peoples R China

[2] Wuhan Univ Technol, Sch Sci, Wuhan 430070, Peoples R China

[3] Zhejiang Univ, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2024年 / 50卷 / 14期

基金：

中国国家自然科学基金;

关键词：

Gas sensor; Perovskite; CsPbBr3; H2S; GAS; SENSORS; SULFIDE; OXIDE;

D O I：

10.1016/j.ceramint.2024.04.295

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Metal -halide perovskite (MHP) nanocrystals (NCs) have unique advantages in the gas sensing field, but the poor stability restricts their widespread applications. In this work, the CsPbBr 3 @Fe 2 O 3 heterojunction NCs were synthesized successfully by simple solution process and subsequent surface modification strategy for constructing a gas sensor. The Fe 2 O 3 shell layer was obtained through thermal decomposition of acetylacetone iron (AAI) at 400 degrees C. The resulting CsPbBr 3 @Fe 2 O 3 heterostructured NCs exhibit a higher gas -sensing performance to H 2 S than pure CsPbBr 3 and Fe 2 O 3 , respectively. Upon exposure to 10 ppm H 2 S, the response value of 4.12 was obtained at a moderate working temperature of 350 degrees C, while the response was fast both in terms of response time and recovery time, i.e. , 1.84 s and 24.20 s, respectively. This might be the best performance for MHP sensors, to the best of our knowledge. The excellent gas -sensitive response might be attributed to the formation of a heterojunction which promotes the electron migration from CsPbBr 3 to Fe 2 O 3 .

引用

页码：25607 / 25612

页数：6