P-type metal oxide semiconductor with extraordinary surface reactions is highly active for gas sensing reactions. However, presenting large active sites in materials surface for sensing reactions is a great challenge. Here, we report a strategy to fabricate Co3O4 hexagonal platelets and characterize the adsorption of ammonia (NH3) by using density-functional theory (DFT) calculations. The as-prepared Co3O4 hexagonal platelets exposed by (112) crystal plane shows high selectivity and sensitivity to NH3 at room temperatures. In addition, fantastic reproducibility of the device is also demonstrated. Such alluring sensing performances can be attributed to unique size, structure, and surface arrangement on the Co3O4 platelets that facilitate the NH3 adsorption and interface interaction. The present studies provided a new insight into improving the selectivity of gas sensors by designing special crystal-facets exposure in the nanomaterials surface matrix.

中文翻译：

具有非凡表面反应的P型金属氧化物半导体对气体传感反应具有很高的活性。然而，在材料表面提供较大的活性位点以感应反应是一个巨大的挑战。在这里，我们报告一种策略，通过使用密度泛函理论（DFT）计算来制造Co 3 O 4六角形血小板并表征氨气（NH 3）的吸附。（112）晶面暴露的Co 3 O 4六角形片晶对NH 3具有较高的选择性和敏感性。在室温下。此外，还展示了该设备的出色再现性。这种诱人的感测性能可以归因于Co 3 O 4血小板上独特的尺寸，结构和表面排列，这有助于NH 3吸附和界面相互作用。通过在纳米材料表面基质中设计特殊的晶面曝光，本研究为提高气体传感器的选择性提供了新的见识。