The design of high-performance and low-power formaldehyde (HCHO) gas sensors is of great interest to researchers for environmental monitoring and human health. Herein, In₂O₃/CsPbBr₃ composites were successfully synthesized through an electrospinning and self-assembly approach, and their ultraviolet-activated (UV-activated) HCHO gas-sensing properties were investigated. The measurement data indicated that the In₂O₃/CsPbBr₃ sensor possesses an excellent selectivity toward HCHO. The response of the In₂O₃/CsPbBr₃ sensor to 2 ppm of HCHO was 31.4, which was almost 11 times larger than that of In₂O₃ alone. Besides, the In₂O₃/CsPbBr₃ sensor also displayed extraordinary linearity (R² = 0.9696), stable reversibility, and ideal humidity resistance. Interestingly, the gas-sensing properties of the In₂O₃/CsPbBr₃ sensor were further improved (R_a/R_g = 54.8) under UV light irradiation. Meanwhile, the response/recovery time was shortened to 7/9 s. The improvement of HCHO-sensing properties might be ascribed to the distinctive structure of In₂O₃ nanofibers, the adsorption capacity of cesium lead bromide quantum dots (CsPbBr₃ QDs) for UV light, and the synergistic effect of heterostructures between the components. Density functional theory (DFT) was implemented to discuss the adsorption ability and electronic characteristics of HCHO at the surface of In₂O₃/CsPbBr₃ composites. Especially, this research points out new constructive thoughts for the exploitation of UV light improved gas-sensing materials.

中文翻译：

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CsPbBr3 量子点改性 In2O3 纳米纤维在紫外照射下室温下有效检测 ppb 级 HCHO


高性能和低功耗甲醛 （HCHO） 气体传感器的设计引起了环境监测和人类健康研究人员的极大兴趣。在此，通过静电纺丝和自组装方法成功合成了_{In 2O 3}/CsPbBr₃ 复合材料，并研究了其紫外激活 （UV-activated） HCHO 气敏性能。测量数据表明，In₂O₃/CsPbBr₃ 传感器对 HCHO 具有出色的选择性。In₂O₃/CsPbBr₃ 传感器对 2 ppm HCHO 的响应为 31.4，几乎是单独使用 In₂O₃ 的 11 倍。此外，In₂O₃/CsPbBr₃ 传感器还表现出非凡的线性度 （R² = 0.9696）、稳定的可逆性和理想的耐湿性。有趣的是，在紫外光照射下，In₂O₃/CsPbBr₃ 传感器的气敏性能进一步改善 （R_a/R_g = 54.8）。同时，响应/恢复时间缩短到 7/9 秒。HCHO 传感性能的改善可能归因于 In₂O₃ 纳米纤维的独特结构、铯溴化铅量子点 （CsPbBr₃ QD） 对紫外光的吸附能力以及组分之间异质结构的协同效应。采用密度泛函理论 （DFT） 讨论了 HCHO 在 In₂O₃/CsPbBr₃ 复合材料表面的吸附能力和电子特性。 特别是，本研究为开发紫外光改进的气敏材料提出了新的建设性思路。