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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2025-07-01
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| author | Hongtao Wang Yang Liu Yuanchao Xie Jianan Ma Dan Han Shengbo Sang |
| author_facet | Hongtao Wang Yang Liu Yuanchao Xie Jianan Ma Dan Han Shengbo Sang |
| author_sort | Hongtao Wang |
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| description | 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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| institution | Kabale University |
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| spelling | doaj-art-5c09659edd9c4100afed7ad39174a60d2025-08-20T03:35:37ZengMDPI AGChemosensors2227-90402025-07-0113723910.3390/chemosensors13070239Hollow Mesoporous ZnO/ZnCo<sub>2</sub>O<sub>4</sub> Based on Ostwald Ripening for H<sub>2</sub>S DetectionHongtao Wang0Yang Liu1Yuanchao Xie2Jianan Ma3Dan Han4Shengbo Sang5Shanxi Key Laboratory of Micro Nano Sensors & Artificial Intelligence Perception, College of Integrated Circuits, Taiyuan University of Technology, Taiyuan 030024, ChinaShanxi Key Laboratory of Micro Nano Sensors & Artificial Intelligence Perception, College of Integrated Circuits, Taiyuan University of Technology, Taiyuan 030024, ChinaShanxi Key Laboratory of Micro Nano Sensors & Artificial Intelligence Perception, College of Integrated Circuits, Taiyuan University of Technology, Taiyuan 030024, ChinaShanxi Key Laboratory of Micro Nano Sensors & Artificial Intelligence Perception, College of Integrated Circuits, Taiyuan University of Technology, Taiyuan 030024, ChinaShanxi Key Laboratory of Micro Nano Sensors & Artificial Intelligence Perception, College of Integrated Circuits, Taiyuan University of Technology, Taiyuan 030024, ChinaShanxi Key Laboratory of Micro Nano Sensors & Artificial Intelligence Perception, College of Integrated Circuits, Taiyuan University of Technology, Taiyuan 030024, ChinaMesoporous 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.https://www.mdpi.com/2227-9040/13/7/239ZnO/ZnCo<sub>2</sub>O<sub>4</sub>heterogeneous interfaceH<sub>2</sub>S sensorOstwald ripening |
| spellingShingle | Hongtao Wang Yang Liu Yuanchao Xie Jianan Ma Dan Han Shengbo Sang Hollow Mesoporous ZnO/ZnCo<sub>2</sub>O<sub>4</sub> Based on Ostwald Ripening for H<sub>2</sub>S Detection Chemosensors ZnO/ZnCo<sub>2</sub>O<sub>4</sub> heterogeneous interface H<sub>2</sub>S sensor Ostwald ripening |
| title | Hollow Mesoporous ZnO/ZnCo<sub>2</sub>O<sub>4</sub> Based on Ostwald Ripening for H<sub>2</sub>S Detection |
| title_full | Hollow Mesoporous ZnO/ZnCo<sub>2</sub>O<sub>4</sub> Based on Ostwald Ripening for H<sub>2</sub>S Detection |
| title_fullStr | Hollow Mesoporous ZnO/ZnCo<sub>2</sub>O<sub>4</sub> Based on Ostwald Ripening for H<sub>2</sub>S Detection |
| title_full_unstemmed | Hollow Mesoporous ZnO/ZnCo<sub>2</sub>O<sub>4</sub> Based on Ostwald Ripening for H<sub>2</sub>S Detection |
| title_short | Hollow Mesoporous ZnO/ZnCo<sub>2</sub>O<sub>4</sub> Based on Ostwald Ripening for H<sub>2</sub>S Detection |
| title_sort | hollow mesoporous zno znco sub 2 sub o sub 4 sub based on ostwald ripening for h sub 2 sub s detection |
| topic | ZnO/ZnCo<sub>2</sub>O<sub>4</sub> heterogeneous interface H<sub>2</sub>S sensor Ostwald ripening |
| url | https://www.mdpi.com/2227-9040/13/7/239 |
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