Bimetallic MOFs-Derived Metal Oxides Co<sub>3</sub>O<sub>4</sub>/SnO<sub>2</sub> Microspheres for Ultrahigh Response <i>n</i>-Butanol Gas Sensors
The construction of p-n heterojunctions is expected to be one of the effective means to improve gas sensitivity. In this research, p-n heterojunctions are successfully constructed by metal oxides derived from metal-organic frameworks (MOFs). MOFs-derived bimetallic Co<sub>3</sub>O<sub>4</sub>/SnO<sub>2</sub> microspheres are prepared by precipitation. Gas-sensing performance shows that the Co<sub>3</sub>O<sub>4</sub>/SnO<sub>2</sub> sensor exhibits an extremely high response (<i>R</i><sub>a</sub>/<i>R</i><sub>g</sub> = 641) to 20 ppm of <i>n</i>-butanol at 200 °C, which is 19 times that of pristine SnO<sub>2</sub>. It can detect <i>n</i>-butanol gas at low concentrations, has good selectivity to alcohol gas, and reduces the interference of benzene gas. The improved gas sensitivity can be attributed to the formation of a stable heterojunction between Co<sub>3</sub>O<sub>4</sub> and SnO<sub>2</sub>, resulting in a greater resistance change of Co<sub>3</sub>O<sub>4</sub>/SnO<sub>2</sub>. Co<sub>3</sub>O<sub>4</sub>/SnO<sub>2</sub> inherits the characteristic of high specific surface area of MOFs, which provides abundant sites for the reaction of the target gas and oxygen molecules. Finally, the gas-sensing mechanism of the Co<sub>3</sub>O<sub>4</sub>/SnO<sub>2</sub>-based sensor is discussed in detail.
Authors
- Shan Ren (ORCID: https://orcid.org/0000-0002-2016-2061)
- Zhenkai Zhang (ORCID: https://orcid.org/0009-0000-1636-6718)
- Xiaochun Gao (ORCID: https://orcid.org/0009-0000-3812-3485)
- Yujun Guo
- Xiaoming Tan (ORCID: https://orcid.org/0000-0002-1258-247X)
- Xi-Tao Yin (ORCID: https://orcid.org/0000-0003-0991-8128)
- Davoud Dastan (ORCID: https://orcid.org/0000-0002-4124-5763)
- Xiao‐Guang Ma (ORCID: https://orcid.org/0000-0002-7935-499X)
- Ying Liu (ORCID: https://orcid.org/0000-0001-7076-352X)
- Feifei Wang (ORCID: https://orcid.org/0000-0002-2547-4072)
- Qiuying Chen (ORCID: https://orcid.org/0000-0001-5909-3959)
Institutions
- Ludong University (CN)
- Cornell University (US)
- Xi'an Jiaotong University (CN)
Publication Details
- Journal
- Langmuir
- Published
- 2024-09-23
- DOI
- https://doi.org/10.1021/acs.langmuir.4c02052
- Citations
- 12
- Primary Topic
- Gas Sensing Nanomaterials and Sensors
- Type
- article
- Field-Weighted Citation Impact
- 2.50
Funders
- Department of Education of Shandong Province
- National Natural Science Foundation of China
- Natural Science Foundation of Shandong Province
- Ludong University
- Taishan Scholar Project of Shandong Province