NH₃ is a fairly important raw material in a number of fields but harmful to the human. Currently, hydrogen substituted graphyne (HsGY) shows fast response to NH₃ gas based on our previous report. However, it still suffers from low response values and humidity interference. CeO₂ has the advantage of moisture resistance as NH₃ gas sensor but prone to agglomeration, whereas the alkyne bond of HsGY can anchor CeO₂ to form a discretely distributed CeO₂. Therefore, highly dispersed CeO₂ nanocubics anchoring on HsGY sheets are synthesized through hydrothermal method. The gas sensing characteristics show that the gas sensing response value to 80 ppm NH₃ is increased by 3 times compared to pure HsGY. Furthermore, they present relatively stable NH₃ gas response under relative humidity variation (20–80 %). In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) is used to reveal the gas sensing mechanism. Energy bands are analyzed using ultraviolet photoemission spectroscopy (UPS), revealing the improvement mechanism of NH₃ gas-sensitive performance. Density functional theory (DFT) calculations are employed to explain selectivity mechanism to NH₃ against other interference gases. Our research provides novel gas sensing materials for the development of high-performance, moisture-resistant room temperature NH₃ sensors.

中文翻译：

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高度分散的 CeO2 纳米立方元件支持在氢取代石墨炔片上，用于高度 NH3 气体传感检测和室温下不受湿度影响


NH₃ 在许多领域都是一种相当重要的原材料，但对人体有害。根据我们之前的报告，目前，氢取代石墨炔 （HsGY） 对 NH₃ 气体表现出快速响应。但是，它仍然受到低响应值和湿度干扰的影响。CeO₂ 作为 NH₃ 气体传感器具有防潮性优势，但容易团聚，而 HsGY 的炔键可以锚定 CeO₂ 形成离散分布的 CeO₂。因此，通过水热法合成了锚定在 HsGY 片材上的高度分散的 CeO₂ 纳米立方。气体传感特性表明，与纯 HsGY 相比，对 80 ppm NH₃ 的气体传感响应值增加了 3 倍。此外，它们在相对湿度变化 （20-80%） 下表现出相对稳定的 NH₃ 气体响应。原位漫反射红外傅里叶变换光谱 （DRIFTS） 用于揭示气体传感机制。使用紫外光电子能谱 （UPS） 分析能带，揭示了 NH₃ 气体敏感性能的改进机制。采用密度泛函理论 （DFT） 计算来解释 NH₃ 对其他干扰气体的选择性机制。我们的研究为开发高性能、防潮室温 NH₃ 传感器提供了新型气体传感材料。