Hybrid organic-inorganic composite based on electroactive aniline trimer decorated MIL-88B(Fe) as hydrogen sulfide sensor

• Published in: Sensors and actuators. B, Chemical Chemical, 2025-01, Vol.422, p.136659, Article 136659
• Main Authors: Yan, Minsi, Wang, Wanyi, Chittibabu, Dinesh Kumar Dhanthala, Chen, Hongyu, Chen, Hsin-Tsung, Lin, Chia-Her, Yeh, Jui-Ming
• Format: Article
• Language: English
• Subjects: Adsorption energy; Aniline trimer; Density functional theory; H2S gas sensors; Metal organic framework
• ISSN: 0925-4005
• DOI: 10.1016/j.snb.2024.136659

This study presents a novel approach to enhancing MIL-88B(Fe) for H₂S sensing by incorporating aniline trimer (ACAT). The successful synthesis and comprehensive characterization of ACAT, MIL-88B(Fe), and their composite, ACAT-MIL-88B(Fe), are detailed. The ACAT-MIL-88B(Fe) sensor demonstrates significantly superior performance, with a sensitivity increase to 643.5 % at 9–10 ppm H₂S and a rapid response time of 288 seconds. It maintains high sensitivity (450 % response) even at 90 % relative humidity and shows excellent selectivity for H₂S over other gases. Stability tests confirm over 600 % responsiveness over 16 days. Density Functional Theory (DFT) calculations validate that H₂S adsorption is most stable at the Fe site of MIL-88B(Fe), with ACAT enhancing this interaction. This innovative sensor holds promise for highly sensitive, selective, and stable H₂S detection in industrial applications. [Display omitted] •ACAT-MIL-88B(Fe) show superior H2S sensitivity, with a 122.3 % response at 1 ppm.•High selectivity for H2S over CO, NO2, NH3, and SO2, achieving a 636 % response to H2S.•Maintains robust performance: a 450 % response at 90 % RH and stability over 16 days.