Recently, SnS is been extensively investigated in the field of gas sensors due to its unique wrinkled honeycomb structure and high specific surface. However, the weak response to NH₃ at room temperature and especially poor moisture resistance limit the application of SnS in high humidity environments. To overcome these challenges, carbon quantum dots (CQDs) with hydroxyl and carboxyl groups on the surface were employed to modify SnS in this work, and the nanocomposite of SnS/CQDs was prepared by hydrothermal and stirring methods, respectively. It is revealed that the hydrothermally prepared nanocomposite SnS/CQDs shows much higher density of CQDs attached to the SnS nanosheets compared to the stirred samples. Resultantly, the hydrothermally prepared SnS/CQDs sensor can sense NH₃ in ppb level and has a 4.78-fold higher response to 10 ppm NH₃ than pure SnS, which are attributed to the heterogeneous structure of SnS/CQDs. Notably, its response value to 2.5 ppm NH₃ at 97 % RH (3.67) is 1.44 times higher than that at 25 % RH, showing a unique humidity-enhanced effect. It was further explained by combining first-principles calculations and humidity-boosted NH₃ adsorption-ionization model. This study provides a feasible way to explore the application potential of SnS-based nanocomposites in high humidity environments.

最近，由于其独特的皱纹蜂窝结构和高比表面积，SnS 在气体传感器领域得到了广泛的研究。但是， SnS在常温下对NH ₃的响应较弱，尤其是防潮性能较差，限制了SnS在高湿环境中的应用。为了克服这些挑战，本工作采用表面具有羟基和羧基的碳量子点 (CQD) 对 SnS 进行修饰，并分别通过水热法和搅拌法制备了 SnS/CQD 的纳米复合材料。结果表明，与搅拌样品相比，水热制备的纳米复合 SnS/CQD 显示出更高密度的 CQD 附着在 SnS 纳米片上。结果表明，水热法制备的SnS/CQDs传感器可以感测NH _{3在 ppb 级，对 10 ppm NH 3}的响应比纯 SnS 高 4.78 倍，这归因于 SnS/CQD 的异质结构。值得注意的是，其在 97% RH 下对 2.5 ppm NH ₃的响应值（3.67）是 25% RH 下的 1.44 倍，显示出独特的湿度增强效果。通过结合第一性原理计算和增加湿度的 NH ₃吸附电离模型进一步解释了这一点。本研究为探索基于 SnS 的纳米复合材料在高湿度环境中的应用潜力提供了一种可行的方法。