Hollow Mesoporous ZnO/ZnCo<sub>2</sub>O<sub>4</sub> Based on Ostwald Ripening for H<sub>2</sub>S Detection
Mesoporous ZnO/ZnCo<sub>2</sub>O<sub>4</sub> nanocomposites with excellent gas-sensing performance were synthesized using the Ostwald ripening method. The as-prepared ZnO/ZnCo<sub>2</sub>O<sub>4</sub> comprised aggregated monodisperse nanoparticles, an...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-07-01
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| Series: | Chemosensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2227-9040/13/7/239 |
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| Summary: | Mesoporous ZnO/ZnCo<sub>2</sub>O<sub>4</sub> nanocomposites with excellent gas-sensing performance were synthesized using the Ostwald ripening method. The as-prepared ZnO/ZnCo<sub>2</sub>O<sub>4</sub> comprised aggregated monodisperse nanoparticles, and the nanoparticle size grew with increasing thermal treatment temperature. Increasing the calcination temperature did not significantly change the overall size of the ZnO/ZnCo<sub>2</sub>O<sub>4</sub> nanocomposites, but the pore size and specific surface area were noticeably affected. The gas-sensing results showed that ZnO/ZnCo<sub>2</sub>O<sub>4</sub> composites calcined at 500 °C exhibited the highest response to H<sub>2</sub>S at 200 °C, with a detection limit of 500 ppb. The ZnO/ZnCo<sub>2</sub>O<sub>4</sub> composites also exhibited remarkable selectivity, response/recovery speed, and stability. Their excellent gas-sensing performance might be attributed to their porous structure, large specific surface area, and the heterogeneous interface between ZnO and ZnCo<sub>2</sub>O<sub>4</sub>. This work not only represents a new example of the Ostwald ripening-based formation of inorganic hollow structures in a template-free aqueous solution but also provides a novel and efficient sensing material for the detection of H<sub>2</sub>S gas. |
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| ISSN: | 2227-9040 |