Lv Sitao, Liu Liming, Guo Lanpeng, Mai Zhijian, Chen Honghao, Wang Chenxu, Wang Fengnan, Li Hao, Lee Yi-Kuen, Umar Siddiqui Ahmad M, Yi Zichuan, Zhou Guofu, Wang Yao
Guangdong Province Key Laboratory of Optical Information Materials and Technology, Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, PR China; Zhongshan Branch of State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, PR China; National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, PR China.
Zhongshan Branch of State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, PR China.
J Hazard Mater. 2024 Oct 5;478:135467. doi: 10.1016/j.jhazmat.2024.135467. Epub 2024 Aug 9.
Formaldehyde (HCHO) is a major indoor pollutant that is extremely harmful to human health even at ppb-level. Meanwhile, ppb-level HCHO is also a potential disease marker in the exhalation of patients with respiratory diseases. Higher humidity resistance and lower practical limit of detection (pLOD) both have to be pursued for practical HCHO sensors. In this work, by assembling indium oxide (InO) and fluorinated dipole modified reduced graphene oxide (rGO), we prepared a high-performance room temperature HCHO sensor (InO @ATQ-rGO). Excellent sensing properties toward HCHO under visible illumination have been achieved, including ultra-low pLOD of 3 ppb and high humidity-resistance. By control experiments and density functional theory calculation, it is indicated that the introduced fluorinated dipoles act as not only an "umbrella" to improve the humidity resistance of the composite, but also a "bridge" to accelerate the electron transport, improving the sensitivity of the material. The significant practicality and reliability of the obtained sensors were verified by in-situ simulation experiments using a 3 m test chamber with a humidity control system and by detection of the simulated lung disease patient's exhalation. This work provides an effective strategy of simultaneously achieving high humidity-resistance and low pLOD of room temperature formaldehyde sensing materials.
甲醛（HCHO）是一种主要的室内污染物，即使在十亿分之一（ppb）的水平下也对人体健康极为有害。同时，十亿分之一水平的甲醛也是呼吸系统疾病患者呼出气体中的一种潜在疾病标志物。对于实际应用的甲醛传感器，需要同时具备更高的耐湿性和更低的实际检测限（pLOD）。在这项工作中，通过组装氧化铟（InO）和氟化偶极修饰的还原氧化石墨烯（rGO），我们制备了一种高性能的室温甲醛传感器（InO@ATQ-rGO）。该传感器在可见光照射下对甲醛具有优异的传感性能，包括3 ppb的超低检测限和高耐湿性。通过对照实验和密度泛函理论计算表明，引入的氟化偶极不仅起到“保护伞”的作用提高复合材料的耐湿性，还起到“桥梁”的作用加速电子传输，提高材料的灵敏度。通过使用带有湿度控制系统的3米测试腔进行原位模拟实验以及检测模拟肺病患者的呼出气体，验证了所制备传感器具有显著的实用性和可靠性。这项工作提供了一种有效策略，可同时实现室温甲醛传感材料的高耐湿性和低检测限。
