In this work, the application of carbon quantum dots as known as CQDs for ethanol detection is pioneered, and a multi-fold improvement in gas sensor performance is achieved through the unique electron transport mechanism of carbon quantum dots. The lychee-like SnO₂ hollow microspheres and CQDs are prepared by a solvent heat method. The composites are assembled by rapid grinding, ultrasonication, and stirring. The minimum detection limit is 500 ppb. The response/recovery time of the best mass percentage composite is 9 s/16 s to ethanol at 100 ppm with an optimum working temperature of 216℃ in the target gas-sensitive test. Such a fast response speed improvement is ascribed to the excellent electron transfer efficiency of the 5 nm diameter carbon quantum dots (CQDs).

在这项工作中，开创了碳量子点（CQDs）在乙醇检测中的应用，并通过碳量子点独特的电子传输机制实现了气体传感器性能的多倍提升。采用溶剂热法制备了荔枝状SnO _{2空心微球和CQD。}复合材料通过快速研磨、超声处理和搅拌组装而成。最低检测限为 500 ppb。最佳质量百分比复合材料对100 ppm乙醇的响应/恢复时间为9 s/16 s，目标气敏试验的最佳工作温度为216℃。如此快速的响应速度提升归因于 5 nm 直径碳量子点 (CQD) 出色的电子转移效率。