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- Title
Highly sensitive and fast response acetone gas sensor based on Co<sub>3</sub>O<sub>4</sub>–ZnO heterojunction assembled by porous nanoflowers.
- Authors
Cheng, Qionglin; Wang, Xudong; Huang, Dandan; Wang, Yongchang; Tan, Xi; Chen, Yawen; Wang, Wenjie; Yi, Ming; Li, Hairong
- Abstract
Acetone is an important raw material for organic synthesis in modern industrial production. However, working in an environment with large acetone concentrations can cause explosive accidents in addition to irreversible damage to the central nervous system. Here, we fabricated a highly sensitive and fast response sensor based on p–n Co3O4–ZnO heterojunctions assembled by porous nanoflowers towards acetone gas through an environmentally friendly hydrothermal method. The 1% Co3O4–ZnO heterojunction has a band gap of 3.1767 eV and is narrower than ZnO with a band gap of 3.209 eV, which promotes electron transition and thus enhances gas-sensitive performance. In addition, the catalysis of Co3O4 reduces the activation energy of the reaction. According to the above advantages, the 1% Co3O4–ZnO heterojunction sensor displays a response as high as 615.5 toward 100 ppm of acetone and is about 16 times higher than that of the ZnO-based sensor. Moreover, long-term stability and good selectivity for various volatile organic compounds (VOCs) are achieved as well as the optimal operating temperature drops from 373 to 273 °C compared to ZnO. The scientific findings of this work will provide value for fabricating reliable acetone gas sensors.
- Publication
Journal of Materials Science: Materials in Electronics, 2023, Vol 34, Issue 2, p1
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-022-09566-y