ACS Applied Materials & Interfaces · 2019 · 111 citations · 55 references
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<sub>2</sub> nanosheets with in-plane mesopores were utilized as the sensing materials. The sensor response ( R<sub>a</sub>/ R<sub>g</sub>) 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<sub>2</sub> 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<sub>2</sub> nanocomposites will provide new paradigms in the future development of HCHO-sensitive materials.
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Generalized self-assembly of scalable two-dimensional transition metal oxide nanosheets
Ziqi Sun, Ting Liao, Yuhai Dou et al. · Nature Communications · 2014 · 874 citations · Full text