Citation: Keke Li, Haiquan Wang, Zhen-Kun He, Yan-Yan Song, Zhida Gao, Chenxi Zhao. Engineering Cl vacancies in lead-free halide double perovskites decorated on TiO₂ nanotubes for highly sensitive NO₂ sensing at room temperature[J]. Chinese Chemical Letters, ;2025, 36(8): 110610. doi: 10.1016/j.cclet.2024.110610 shu

Engineering Cl vacancies in lead-free halide double perovskites decorated on TiO₂ nanotubes for highly sensitive NO₂ sensing at room temperature

Keke Li ^a ,
Haiquan Wang ^a ,
Zhen-Kun He ^a ,
Yan-Yan Song ^{a, *,} ,
Zhida Gao ^{a, *,} ,
Chenxi Zhao ^{b, *,}

a.
College of Sciences, Northeastern University, Shenyang 110819, China
b.
School of Forensic Medicine, China Medical University, Shenyang 110122, China

yysong@mail.neu.edu.cn

gaozd@mail.neu.edu.cn

cxzhao@cmu.edu.cn

Received Date: 2 June 2024
Revised Date: 7 October 2024
Accepted Date: 3 November 2024
Available Online: 5 November 2024

Figures(6)

The sensitive and selective monitoring of nitrogen dioxide (NO₂) can have a significant impact on environmental monitoring and health protection. Unfortunately, commercial NO₂ sensors largely suffer from poor detection sensitivity and high operating temperatures. In this study, we developed a sensitive room-temperature NO₂ sensor based on an n-n heterojunction comprised of a Cs₂AgInCl₆ perovskite with chlorine vacancies (V_Cl) and TiO₂ nanotube arrays (V_Cl-Cs₂AgInCl₆/TiO₂ NTs). In this design, the large number of chlorine vacancies in the Cs₂AgInCl₆ perovskite act as active sites for oxygen adsorption and the subsequent sensing reaction. Benefitting from the formation of the n-n type heterojunction and the one-dimensional structure of the TiO₂ nanotubes, the Fermi levels are aligned, thereby facilitating the efficient transport of charge carriers between the target gas and the sensing interface. The resulting V_Cl-Cs₂AgInCl₆/TiO₂ NTs demonstrate a high response of 7.26 toward 1ppm of NO₂ at room temperature, possess a detection limit as low as 20 ppb, and have outstanding performance stability. This work widens the application of perovskite materials and indicates their potential application in medical diagnostics, environmental monitoring, and smart sensing systems.
- TiO₂ nanotube arrays,
- n-n Type heterojunction,
- Room temperature,
- Cl vacancy,
- NO₂ detection
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Engineering Cl vacancies in lead-free halide double perovskites decorated on TiO2 nanotubes for highly sensitive NO2 sensing at room temperature

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通讯作者: 陈斌, bchen63@163.com

Engineering Cl vacancies in lead-free halide double perovskites decorated on TiO₂ nanotubes for highly sensitive NO₂ sensing at room temperature