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A "Turn-on" fluorescence perovskite sensor based on MAPbBr3/mesoporous TiO2 for NH3 and amine vapor detections.

Authors :
Li, Guishun
She, Changkun
Zhang, Yu
Li, Hongkai
Liu, Shaohua
Yue, Fangyu
Jing, Chengbin
Cheng, Ya
Chu, Junhao
Source :
Sensors & Actuators B: Chemical. Jan2021, Vol. 327, pN.PAG-N.PAG. 1p.
Publication Year :
2021

Abstract

• A perovskite-based NH 3 /amine sensor via the "turn-on" fluorescence process. • The sensor is built by depositing the MAPbBr 3 on the mp-TiO 2 layer. • Excellent NH 3 response (72% at 5 ppm, and 988% at 100 ppm, respectively). • Favorable reversibility, high gas selectivity, humidity insensitivity, and regeneration. • NH 3 -induced trap passivation and electron transfer blocking. Recently, lead halide perovskites have attracted great interest in toxic gas detection, but as gas sensor, it is still a challenge to achieve their high-performance. Here, we propose a novel "turn-on" fluorescence NH 3 /amine vapor sensor by depositing the CH 3 NH 3 PbBr 3 (MAPbBr 3) on the mesoporous TiO 2 (mp-TiO 2) layer. The fluorescence intensity of the sensor increases rapidly within seconds upon exposure to NH 3 gas (72 % at 5 ppm and 988 % at 100 ppm, respectively) with excellent reversibility, high gas selectivity, humidity insensitivity, and regeneration. Moreover, the sensor can be further used for detecting various amine vapors, including methylamine, ethylamine, propylamine, butylamine, hexylamine, octylamine, and decylamine. We presumed the "turn-on" fluorescence sensing mechanism is that the trace NH 3 or amine molecules could decrease the surface trap defects and facilitate the formation of passivation layer. It will impede the electron-injection into mp-TiO 2 , which induces the radiative electron-hole recombination and fluorescence enhancement. This research demonstrates that it is feasible to design a "turn-on" fluorescence gas sensor based on the mp-TiO 2 -based perovskite. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09254005
Volume :
327
Database :
Academic Search Index
Journal :
Sensors & Actuators B: Chemical
Publication Type :
Academic Journal
Accession number :
146995540
Full Text :
https://doi.org/10.1016/j.snb.2020.128918