基于Cs<sub>4</sub>PbBr<sub>6</sub>纳米晶的超高灵敏度电阻型湿敏传感器

doi:10.11896/cldb.24040002

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Abstract In this work, Cs₄PbBr₆ nanocrystals were synthesized via a modified ligand-assisted reprecipitation method and a humidity sensor based on Cs₄PbBr₆ nanocrystals was assembled. Phase structure, micromorphology, energy band structure, optical properties and surface state were characterized. Humidity sensing performance and humidity sensing mechanism were also tested. Research results show that Cs₄PbBr₆ nanocrystals contain abundant bromine vacancy defects and have good hydrophilicity. The Cs₄PbBr₆ nanocrystals humidity sensor has an ultra-high response value of 2.32×10⁵, a hysteresis of 5.14%, excellent linearity, a short response/recovery time of 14 s/10 s, excellent long-term stability and gas selectivity in the humidity range of 11%—98%. It is capable for non-contact switch and breath detection. The excellent humidity sensing properties of Cs₄PbBr₆ nanocrystals are attributed to the bromine vacancy defects in the material, which serve as active sites to promote the adsorption and dissociation of water molecules.

Key words： Cs₄PbBr₆ nanocrystal humidity sensor bromine vacancy defect ultra-high sensitivity

Published: 10 February 2025 Online: 2025-02-05

CLC number:

TB34

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	GUO Hongbing
	LIU Yueli

Cite this article:

GUO Hongbing,LIU Yueli. Ultra-sensitive Resistive Humidity Sensor Based on Cs₄PbBr₆ Nanocrystals[J]. Materials Reports, 2025, 39(3): 24040002-7.

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http://www.mater-rep.com/EN/10.11896/cldb.24040002 OR http://www.mater-rep.com/EN/Y2025/V39/I3/24040002

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