High-performance NO₂ gas sensor at room temperature is vital in daily life. Herein, the performance of SnS₂ hierarchical structure modified by Au nanoparticles was explored as a NO₂ sensing material at room temperature. The samples were synthesized by solvothermal method and subsequent in-situ reduction method which could be confirmed by the analysis results of X-ray powder diffractometer (XRD), field-emission scanning electronic microscope (FESEM), transmission electron microscopy (TEM) and X-ray photoelectron spectra (XPS). Through a series of gas sensing measurements, the sensor based on Au-SnS₂ possesses outstanding NO₂ sensing properties under visible light at room temperature, including high response at trace concentration (14.24/5 ppm), excellent response/recovery time (29/148 s), low detection limit (36 ppb), satisfactory selectivity and repeatability. Combined with the first-principles calculations, the enhanced sensing performance can be contributed to the modification of Au with rich charge transfer (−0.5153 e) and the local surface plasmon resonance (LSPR) between Au and visible light with the enhanced optical absorption capacity and carrier density of the material. This work proffers opportunities for real-time NO₂ detection in daily life.

室温下的高性能 NO _{2气体传感器在日常生活中至关重要。}在此，探讨了由Au 纳米粒子修饰的SnS ₂分级结构在室温下作为NO ₂传感材料的性能。样品通过溶剂热法和随后的原位还原法合成，可以通过X射线粉末衍射仪（XRD），场发射扫描电子显微镜（FESEM），透射电子显微镜（TEM）和X的分析结果来证实。 -射线光电子能谱 (XPS)。通过一系列气敏测量，基于 Au-SnS _{2 的}传感器具有出色的 NO ₂室温下可见光下的传感特性，包括痕量浓度 (14.24/5 ppm) 的高响应、出色的响应/恢复时间 (29/148 s)、低检测限 (36 ppb)、令人满意的选择性和可重复性。结合第一性原理计算，增强的传感性能有助于 Au 的修饰，具有丰富的电荷转移（-0.5153 e）和 Au 与可见光之间的局域表面等离子体共振（LSPR），具有增强的光吸收能力和材料的载流子密度。这项工作为日常生活中的实时 NO _{2检测提供了机会。}