Ye Wen, Lin Hong-Zhen, Li Menglong, Jiang Lihua, Chen Dongyun, Lu Jian-Mei
State Key Laboratory of Bioinspired Interfacial Materials Science, College of Chemistry Chemical Engineering and Materials Science, Collaborative Innovation Center of Suzhou Nano Science and Technology, National United Engineering Laboratory of Functionalized Environmental Adsorption Materials, Soochow University, Suzhou, China.
Key Laboratory of Intelligent Optoelectronic Devices and Chips of Jiangsu Higher Education Institutions, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou, 215009, China.
Nat Commun. 2025 May 24;16(1):4820. doi: 10.1038/s41467-025-60206-5.
Halide perovskite gas sensors have a low gas detection limit at room temperature, surpassing the performance of traditional metal oxide chemiresistors. However, they are prone to structural decomposition and performance loss due to the lack of coordination unsaturated surface metal ions and sensitivity to environmental factors such as water, oxygen, heat, and light. To address this issue, we present a general strategy: replacing the cation Cs in inorganic perovskite CsAgBiBr with long-chain alkylamines. This modification synthesizes perovskite sensor materials that effectively block moisture and exhibit excellent stability under real-working conditions. The chemiresistors show high sensitivity and stability to CO gas, with (BA)AgBiBr detecting CO at a limit of 20 ppb, maintaining performance after 270 days of continuous exposure to ambient air. The exceptional performance of (BA)AgBiBr is elucidated through density functional theory calculations combined with sum frequency generation spectroscopy, marking a significant breakthrough in halide perovskite-based gas sensing by surpassing the stability and sensitivity of traditional sensors.
卤化物钙钛矿气体传感器在室温下具有低气体检测限，超越了传统金属氧化物化学电阻器的性能。然而，由于缺乏配位不饱和表面金属离子以及对水、氧气、热和光等环境因素敏感，它们容易发生结构分解和性能损失。为了解决这个问题，我们提出了一种通用策略：用长链烷基胺取代无机钙钛矿CsAgBiBr中的阳离子Cs。这种改性合成了能有效阻挡水分并在实际工作条件下表现出优异稳定性的钙钛矿传感器材料。这些化学电阻器对CO气体具有高灵敏度和稳定性，(BA)AgBiBr检测CO的极限为20 ppb，在连续暴露于环境空气270天后仍保持性能。通过密度泛函理论计算结合和频产生光谱对(BA)AgBiBr的优异性能进行了阐释，通过超越传统传感器的稳定性和灵敏度，在基于卤化物钙钛矿的气体传感方面取得了重大突破。
