School of Material Science & Engineering , University of Shanghai for Science and Technology , Shanghai 200093 , China.
Shanghai Innovation Institution for Materials , Shanghai 200444 , China.
ACS Appl Mater Interfaces. 2019 Apr 3;11(13):12808-12818. doi: 10.1021/acsami.9b01465. Epub 2019 Mar 21.
In this article, we demonstrated an extremely high-sensitivity formaldehyde (HCHO) gas sensor, where the graphene oxide (GO) in situ modified two-dimensional (2D) SnO nanosheets with in-plane mesopores were utilized as the sensing materials. The sensor response ( R/ R) was larger than 2000 toward 100 ppm HCHO at 60 °C. In addition, the selectivity for detecting HCHO was excellent against other interferences including ethanol, acetone, methanol, toluene, ammonia, water, etc. The outstanding sensing performance of 2D mesoporous GO/SnO nanosheets was attributed to the synergism of the sensitizer effect of GO, large surface areas of 2D nanostructure, suitable particle size, and abundant in-plane mesopores. The high sensitivity, high selectivity, and low working temperature of the sensor reported here endowed it a great potential in selective detection of HCHO. Meanwhile, the design and synthesis of GO/SnO nanocomposites will provide new paradigms in the future development of HCHO-sensitive materials.
在本文中，我们展示了一种超高灵敏度的甲醛（HCHO）气体传感器，其中原位修饰的具有面内介孔的氧化石墨烯（GO）二维（2D）SnO 纳米片被用作传感材料。在 60°C 下，传感器对 100ppm HCHO 的响应（R/R）大于 2000。此外，该传感器对 HCHO 的检测具有优异的选择性，对包括乙醇、丙酮、甲醇、甲苯、氨、水等在内的其他干扰物质具有良好的抗干扰能力。2D 介孔 GO/SnO 纳米片具有出色的传感性能，这归因于 GO 的敏化效应、2D 纳米结构的大表面积、合适的粒径和丰富的面内介孔的协同作用。本研究中报道的传感器具有高灵敏度、高选择性和低工作温度，有望在 HCHO 的选择性检测中得到应用。同时，GO/SnO 纳米复合材料的设计和合成将为未来 HCHO 敏感材料的发展提供新的范例。
