AUTHOR=Pi Shoumiao , Zhang Xiaoxing , Cui Hao , Chen Dachang , Zhang Guozhi , Xiao Song , Tang Ju 

TITLE=Facile Fabrication of Au Nanoparticles/Tin Oxide/Reduced Graphene Oxide Ternary Nanocomposite and Its High-Performance SF6 Decomposition Components Sensing

JOURNAL=Frontiers in Chemistry

VOLUME=7

YEAR=2019

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2019.00476

DOI=10.3389/fchem.2019.00476

ISSN=2296-2646

ABSTRACT=<p>A high-performance sensor for detecting SF<sub>6</sub> decomposition components (H<sub>2</sub>S and SOF<sub>2</sub>) was fabricated via hydrothermal method using Au nanoparticles/tin oxide/reduced graphene oxide (AuNPs-SnO<sub>2</sub>-reduced graphene oxide [rGO]) hybrid nanomaterials. The sensor has gas-sensing properties that responded and recovered rapidly at a relatively low operating temperature. The structure and micromorphology of the prepared materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Raman spectroscopy, energy-dispersive spectroscopy (EDS), and Brunauer-Emmett-Teller (BET). The gas-sensing properties of AuNPs-SnO<sub>2</sub>-rGO hybrid materials were studied by exposure to target gases. Results showed that AuNPs-SnO<sub>2</sub>-rGO sensors had desirable response/recovery time. Compared with pure rGO (210/452 s, 396/748 s) and SnO<sub>2</sub>/rGO (308/448 s, 302/467 s), the response/recovery time ratios of AuNPs-SnO<sub>2</sub>-rGO sensors for 50 ppm H<sub>2</sub>S and 50 ppm SOF<sub>2</sub> at 110°C were 26/35 s and 41/68 s, respectively. Furthermore, the two direction-resistance changes of the AuNPs-SnO<sub>2</sub>-rGO sensor when exposed to H<sub>2</sub>S and SOF<sub>2</sub> gas made this sensor a suitable candidate for selective detection of SF<sub>6</sub> decomposition components. The enhanced sensing performance can be attributed to the heterojunctions with the highly conductive graphene, SnO<sub>2</sub> films and Au nanoparticles.</p>