In Situ Synthesis of Hierarchical Co(CO<sub>3</sub>)<sub>0.5</sub>(OH)·0.11H<sub>2</sub>O@ZIF‐67/WO<sub>3</sub> With High Humidity Immunity and Response to H<sub>2</sub>S Sensing
H<sub>2</sub>S gas sensors with facile preparation, low detection limits, and high selectivity are crucial for environmental and human health monitoring. However, it is difficult to maintain a high response of H<sub>2</sub>S gas sensors under high humidity in practical applications. To face this dilemma, a layer-by-layer growth method is applied to in situ prepare a nanostructured Co(CO<sub>3</sub>)<sub>0.5</sub>(OH)·0.11H<sub>2</sub>O/WO<sub>3</sub> coated by a hydrophobic hierarchical ZIF-67 as the H<sub>2</sub>S sensor. This novel composite exhibits excellent humidity immunity without sacrificing the excellent sensitivity and selectivity of H<sub>2</sub>S. At a low operating temperature of 90 °C, a remarkable response value of 1052.3 to 100 ppm H<sub>2</sub>S has been achieved, which is 779 and 9.36 times higher than that of pure WO<sub>3</sub> and Co(CO<sub>3</sub>)<sub>0.5</sub>(OH)·0.11H<sub>2</sub>O/WO<sub>3</sub>, respectively. More importantly, an 82.2% relative response value remains at a high humidity of 75%RH. The sensing mechanisms are investigated using gas chromatography-mass spectrometry (GC-MS), which revealed that the reaction products are H<sub>2</sub>O and SO<sub>2</sub>. The high humidity immunity and fast response of the Co(CO<sub>3</sub>)<sub>0.5</sub>(OH)·0.11H<sub>2</sub>O@ZIF-67/WO<sub>3</sub> demonstrate the layer-by-layer in situ synthesis method holds the potential application for the development of high-performance WO<sub>3</sub>-based H<sub>2</sub>S sensors.
Authors
- Xiaomei Qin
- Dongjie Guo (ORCID: https://orcid.org/0000-0002-9426-7544)
- Yanghai Gui (ORCID: https://orcid.org/0000-0001-7132-4799)
- Di Zhao (ORCID: https://orcid.org/0000-0003-0856-7522)
- Jintao Wu (ORCID: https://orcid.org/0000-0003-4257-2288)
- Yun Wang (ORCID: https://orcid.org/0000-0001-8619-0455)
- Kuan Tian (ORCID: https://orcid.org/0000-0003-3138-3262)
- Shuaishuai Zhao (ORCID: https://orcid.org/0009-0006-0996-9223)
- Xiaoyun Qin (ORCID: https://orcid.org/0000-0002-8900-1231)
- Huishi Guo (ORCID: https://orcid.org/0000-0002-7394-1237)
Institutions
- Griffith University (AU)
- Zhengzhou University of Light Industry (CN)
Publication Details
- Journal
- Advanced Science
- Published
- 2024-08-19
- DOI
- https://doi.org/10.1002/advs.202402352
- Citations
- 13
- Primary Topic
- Gas Sensing Nanomaterials and Sensors
- Type
- article
- Field-Weighted Citation Impact
- 2.71
Funders
- National Computational Infrastructure
- Australian Government
- Open Research Fund Program of Science and Technology on Aerospace Chemical Power Laboratory
- Griffith University
- National Natural Science Foundation of China
- Government of Western Australia
- Australian Research Council
- Henan Provincial Science and Technology Research Project
- National Cancer Institute