Abstract
Facile synthesis of advanced porous nanomaterials for enhanced gas sensing performance has gained increasing interest. Here, we report our study on the preparation of ultrathin porous ZnO nanoplates by a urea mediated hydrothermal method for acetone gas-sensor application. The synthesized ZnO nanomaterials were nanoplates with a porous structure, high crystallinity, and ultrathin thickness of approximately 15 nm. The gas-sensing characteristics of the ultrathin porous ZnO nanoplates were studied at 350–450 °C. The sensor showed the highest response to acetone among the tested gases (methanol, ethanol, acetone, toluene and ammonia); the response to 2.5 ppm acetone was 1.8. The sensor also showed a low 45 ppb detection limit with excellent stability and selectivity at 450 °C. The acetone-sensing mechanism of the ultrathin porous ZnO nanoplates was also discussed. Overall, the findings indicated that the ultrathin porous ZnO nanoplates were excellent materials for sensing applications (e.g., breath analysis) of volatile organic compounds.
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