Abstract Formaldehyde (HCHO) is widely known as an indoor air pollutant, and the monitoring of the gas has significant importance. However, most HCHO sensing materials do not have low detection limits and operate at high temperatures. Herein, two-dimensional (2D) mesoporous ultrathin SnO 2 modified with nitrogen-doped graphene quantum dots (N-GQDs) was synthesized. The N-GQDs/SnO 2 nanocomposite demonstrated high efficiency for HCHO detection. With the addition of 1.00 wt% N-GQDs, the response ( R a / R g ) of SnO 2 gas sensor increased from 120 to 361 at 60 °C for the detection of 10 × 10 −6 HCHO. In addition, the corresponding detection limit was as low as 10 × 10 −9 . Moreover, the sensor exhibited excellent selectivity and stability for the detection of HCHO. The enhanced sensing performance was attributed to both the large specific surface area of SnO 2 and electron regulation of N-GQDs. Therefore, this study presents a novel HCHO sensor, and it expands the research and application potential of GQDs nanocomposites. Graphical abstract

中文翻译：

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通过氮掺杂石墨烯量子点增强二维介孔 SnO2 的甲醛敏感性

摘要 甲醛（HCHO）是众所周知的室内空气污染物，对其进行监测具有重要意义。然而，大多数 HCHO 传感材料不具有低检测限并且在高温下工作。在此，合成了用氮掺杂石墨烯量子点 (N-GQD) 改性的二维 (2D) 介孔超薄 SnO 2 。N-GQDs/SnO 2 纳米复合材料表现出对 HCHO 检测的高效率。添加 1.00 wt% N-GQDs 后，SnO 2 气体传感器在 60 °C 下检测 10 × 10 -6 HCHO 时的响应 (R a / R g ) 从 120 增加到 361。此外，相应的检测限低至10 × 10 -9 。此外，该传感器对 HCHO 的检测表现出优异的选择性和稳定性。增强的传感性能归因于 SnO 2 的大比表面积和 N-GQD 的电子调节。因此，本研究提出了一种新型的 HCHO 传感器，它扩展了 GQDs 纳米复合材料的研究和应用潜力。图形概要