A series of Au NPs decorated hierarchical InO/SnInS microcubes were prepared by in-situ growing SnInS nanosheets on the surface of InO microcubes and followed by reducing Au NPs on the surface of the hierarchical composite. The gas sensing performance of the sensors based on the as-prepared materials were systematically assessed. And the results showed that coverage of SnInS and introduction of appropriate amount of Au NPs improved the gas sensing response of InO toward NO at room temperature (RT). In particular, the sensor fabricated with 3 wt% Au NPs decorated InO/SnInS exhibited excellent selectivity (S/S > 12.6), high response (155.65–7 ppm NO), low theoretical limit of detection (LOD, 21.43 ppb), fast response/recovery time (132/191 s), good anti-interference performance, as well as repeatability and stability. The outstanding sensing performance at RT might be associated with a synergistic effect of heterostructures and the spillover effect of Au NPs, which could enlarge the electron depletion layer and promote the adsorption and dissociation of oxygen and nitrogen dioxide molecules.

中文翻译：

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原位构建金纳米粒子装饰分层 In2O3/SnIn4S8 微立方体，以增强室温下痕量 NO2 传感性能


通过在 InO 微立方体表面原位生长 SnInS 纳米片，然后在分层复合材料表面还原 Au NPs，制备了一系列 Au NP 装饰的分层 InO/SnInS 微立方体。对基于所制备材料的传感器的气体传感性能进行了系统评估。结果表明，SnInS的覆盖和适量Au NP的引入改善了InO在室温（RT）下对NO的气敏响应。特别是，用 3 wt% Au NP 装饰的 InO/SnInS 制成的传感器表现出优异的选择性 (S/S > 12.6)、高响应 (155.65–7 ppm NO)、低理论检测限 (LOD，21.43 ppb)、响应/恢复时间快（132/191秒），抗干扰性能好，具有重复性和稳定性。出色的RT传感性能可能与异质结构的协同效应和Au NPs的溢出效应有关，它可以扩大电子耗尽层并促进氧气和二氧化氮分子的吸附和解离。