Mesoporous Ultrathin SnO2 Nanosheets in Situ Modified by Graphene Oxide for Extraordinary Formaldehyde Detection at Low Temperatures

Ding Wang; Liang Tian; Huijun Li; Kechuang Wan; Xin Yu; Ping Wang; Aiying Chen; Xianying Wang; Junhe Yang

doi:10.1021/acsami.9b01465

Mesoporous Ultrathin SnO₂ Nanosheets in Situ Modified by Graphene Oxide for Extraordinary Formaldehyde Detection at Low Temperatures

ACS Appl Mater Interfaces. 2019 Apr 3;11(13):12808-12818. doi: 10.1021/acsami.9b01465. Epub 2019 Mar 21.

Authors

Ding Wang^{1

2}, Liang Tian¹, Huijun Li¹, Kechuang Wan¹, Xin Yu¹, Ping Wang¹, Aiying Chen¹, Xianying Wang^{1

2}, Junhe Yang^{1

2}

Affiliations

¹ School of Material Science & Engineering , University of Shanghai for Science and Technology , Shanghai 200093 , China.
² Shanghai Innovation Institution for Materials , Shanghai 200444 , China.

PMID: 30740975
DOI: 10.1021/acsami.9b01465

Abstract

In this article, we demonstrated an extremely high-sensitivity formaldehyde (HCHO) gas sensor, where the graphene oxide (GO) in situ modified two-dimensional (2D) SnO₂ nanosheets with in-plane mesopores were utilized as the sensing materials. The sensor response ( R_a/ R_g) 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/SnO₂ 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/SnO₂ nanocomposites will provide new paradigms in the future development of HCHO-sensitive materials.

Keywords: SnO2 nanosheets; formaldehyde gas sensors; graphene oxide; nanocomposites; two-dimensional structure.