Details

Autor(en) / Beteiligte

• Doan, Tan Le Hoang
• Kim, Jin-Young
• Lee, Jae-Hyoung
• Nguyen, Linh Ho Thuy
• Dang, Y Thi
• Bui, Kim-Binh Thi
• Pham, Anh Tuan Thanh
• Mirzaei, Ali
• Phan, Thang Bach
• Kim, Sang Sub

Titel

Preparation of n-ZnO/p-Co3O4 heterojunctions from zeolitic imidazolate frameworks (ZIF-8/ZIF-67) for sensing low ethanol concentrations

Ist Teil von

• Sensors and actuators. B, Chemical, 2021-12, Vol.348, p.130684, Article 130684

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Nano-heterojunctions of n-ZnO/p-Co3O4 with varying molar ratios of Co3O4 derived from a zeolitic imidazolate framework (ZIF-8/ZIF-67) were efficiently synthesized and well-characterized. The heterojunction-based gas sensors were then used for sensing various gases, including ethanol. Owing in part to the ZIF-8/ZIF-67 structure, the calcined n-ZnO/p-Co3O4 with 30 mol% Co3O4 was the best sensor, in-terms of high response, outstanding selectivity, and good repeatability for low concentrations of ethanol at 300 °C. According to detailed analysis, the high ethanol-sensing performance of the n-ZnO/p-Co3O4 nanocomposite could be attributed to the high-porosity of sensing materials, formation of p-n heterojunction at interfaces, the catalytic ability of Co3O4, and the high crystallinity of the ZnO phase in the nano-heterojunctions. [Display omitted] •The sensor is useful for detecting low ethanol concentration for saving the passive drinking occupants, such as children.•Porous n-ZnO/p-Co3O4 heterojunctions derived from zeolitic imidazolate frameworks viaprecipitation and calcination methods.•Gas-sensing properties were controlled by the p–n heterojunction, the catalysis of Co3O4 and the crystallinity of the ZnO phase.•The n-ZnO/p-Co3O4 with 30 mol% Co3O4 was the best ethanol sensor with high response (1 ppm).