Explosives can be analyzed for their content by detecting the photolytic gaseous byproducts. However, to prevent electrostatic sparking, explosives are frequently preserved in conditions with low temperatures and high humidity, impeding the performance of gas detection. Thus, it has become a research priority to develop gas sensors that operate at ambient temperature and high humidity levels in the realm of explosive breakdown gas-phase detection. In this work, 3-aminopropyltriethoxysilane (APTES) self-assembled monolayer-functionalized tin diselenide (APTES-SnSe₂) nanosheets were synthesized via a facile solution stirring strategy, resulting in a room-temperature NO₂ sensor with improved sensitivity and humidity tolerance. The APTES-SnSe₂ sensor with moderate functionalization time outperforms the pure SnSe₂ sensor in terms of the response value (317.51 vs 110.98%) and response deviation (3.11 vs 24.13%) under humidity interference to 500 ppb NO₂. According to density functional theory simulations, the stronger adsorption of terminal amino groups of the APTES molecules to NO₂ molecules and stable adsorption energy in the presence of H₂O are the causes of the improved sensing capabilities. Practically, the APTES-SnSe₂ sensor achieves accurate detection of photolysis gases from trace nitro explosives octogen, pentaerythritol tetranitrate, and trinitrotoluene at room temperature and various humidity levels. This study provides a potential strategy for the construction of gas sensors with high responsiveness and antihumidity capabilities to identify explosive content in harsh environments.

中文翻译：

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基于 3-氨基丙基三乙氧基硅烷自组装单层功能化 SnSe2 的二氧化氮传感器灵敏度和耐湿性的双重改进，用于爆炸性光解气体检测

可以通过检测光解气态副产物来分析爆炸物的含量。然而，为了防止静电火花，爆炸物经常在低温和高湿度条件下保存，阻碍了气体检测的性能。因此，开发可在常温高湿环境下工作的气体传感器成为爆炸物击穿气相检测领域的研究重点。在这项工作中，通过简便的溶液搅拌策略合成了3-氨基丙基三乙氧基硅烷 (APTES) 自组装单层功能化二硒化锡 (APTES-SnSe ₂ ) 纳米片，从而获得了具有更高灵敏度和耐湿性的室温 NO _{2传感器。}APTES-SnSe ₂具有中等功能化时间的传感器在对 500 ppb NO _{2 的}湿度干扰下的响应值（317.51对110.98%）和响应偏差（3.11对24.13%）方面优于纯 SnSe ₂传感器。根据密度泛函理论模拟，APTES分子的末端氨基对NO _{2分子的更强吸附以及在H 2} O存在下稳定的吸附能是传感能力提高的原因。实际上，APTES-SnSe ₂传感器实现了对微量硝基炸药奥克托金、季戊四醇四硝酸酯和三硝基甲苯在室温和各种湿度条件下的光解气体的准确检测。这项研究为构建具有高响应性和抗湿能力的气体传感器提供了一种潜在的策略，以识别恶劣环境中的爆炸物。