In this work, MoS₂ nanosheets decorated with SnO₂ nanoparticles were prepared via a facile two-step hydrothermal method, which possesses a proposed sensing composite structure of supporting layer/sensitive dots. The SnO₂/MoS₂ nanocomposites exhibited an excellent sensing response (2080.36) toward 200 ppm NH₃, which was ∼27.5 times higher than that of pristine MoS₂ films, a fast response/recovery time (23/1.6 s) toward 50 ppm at room temperature (22℃), and outstanding selectivity to NH₃ against CH₄, H₂, CO, H₂S, and NO₂ and good repeatability. The excellent gas sensing properties could be dominated by the unique thin layers assembled flower-like structures of 2D MoS₂, which foster the carrier charge transfer process and the reaction to SnO₂/MoS₂ and NH₃. These results present the SnO₂/MoS₂ nanocomposites promising candidate materials for high-performance NH₃ gas sensing at room temperature.

在这项工作中，通过方便的两步水热法制备了装饰有SnO ₂纳米粒子的MoS ₂纳米片，该方法具有拟议的支撑层/敏感点的感测复合结构。SnO ₂ / MoS ₂纳米复合材料对200 ppm NH ₃表现出出色的感测响应（2080.36），比原始MoS ₂膜高约27.5倍，对50 ppm的响应/恢复时间短（23 / 1.6 s）在室温（22℃）下，对NH ₃对CH ₄，H ₂，CO，H ₂ S和NO _2的选择性很高重复性好 优异的气体感测性能可能由2D MoS ₂的独特的薄层组装花状结构主导，这促进了载流子电荷转移过程以及与SnO ₂ / MoS ₂和NH _3的反应。这些结果表明SnO ₂ / MoS ₂纳米复合材料有望在室温下用于高性能NH ₃气体传感的候选材料。