A recent progress in new emerging two-dimensional (2D) materials has provided promising opportunity for gas sensing in ultra-low detectable concentration. In this work, we have demonstrated a flexible NO2 gas sensor with porous structure graphene on polyethylene terephthalate substrates operating at room temperature. The gas sensor exhibited good performance with response of 1.2% and a fast response time within 30 s after exposure to 50 × 10−9 NO2 gas. As porous structure of graphene increased the surface area, the sensor showed high sensitivity of ppb level for NO2 detection. Au nanoparticles were decorated on the surface of the porous structure graphene skeleton, resulting in an incensement of response compared with pristine graphene. Au nanoparticles-decorated graphene exhibits not only better sensitivity (1.5–1.6 times larger than pristine graphene) for NO2 gas detection, but also fast response. The sensor was found to be robust and sensitive under the cycling bending test, which could also be ascribed to the merits of graphene. This porous structure graphene-based gas sensor is expected to enable a simple and inexpensive flexible gas sensing platform.

中文翻译：

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Au修饰的多孔结构石墨烯具有增强的传感性能，用于低浓度二氧化氮检测

新出现的二维 (2D) 材料的最新进展为超低可检测浓度的气体传感提供了有希望的机会。在这项工作中，我们展示了在室温下运行的聚对苯二甲酸乙二醇酯基板上具有多孔结构石墨烯的柔性 NO2 气体传感器。该气体传感器表现出良好的性能，在暴露于 50 × 10−9 NO2 气体后 30 秒内响应为 1.2% 和快速响应时间。由于石墨烯的多孔结构增加了表面积，传感器对 NO2 检测显示出 ppb 级的高灵敏度。Au纳米颗粒装饰在多孔结构石墨烯骨架的表面，与原始石墨烯相比，反应更强烈。金纳米粒子修饰的石墨烯不仅表现出更好的灵敏度（1.5-1. 比原始石墨烯大 6 倍）用于 NO2 气体检测，而且响应速度快。发现该传感器在循环弯曲测试下坚固且灵敏，这也可以归因于石墨烯的优点。这种基于多孔结构的石墨烯气体传感器有望实现简单且廉价的灵活气体传感平台。