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. 2019 Jul 15:7:476.
doi: 10.3389/fchem.2019.00476. eCollection 2019.

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

Shoumiao Pi  1 , Xiaoxing Zhang  1   2 , Hao Cui  3 , Dachang Chen  1 , Guozhi Zhang  1 , Song Xiao  1 , Ju Tang  1
Affiliations

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

Shoumiao Pi et al. Front Chem. .

Abstract

A high-performance sensor for detecting SF6 decomposition components (H2S and SOF2) was fabricated via hydrothermal method using Au nanoparticles/tin oxide/reduced graphene oxide (AuNPs-SnO2-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-SnO2-rGO hybrid materials were studied by exposure to target gases. Results showed that AuNPs-SnO2-rGO sensors had desirable response/recovery time. Compared with pure rGO (210/452 s, 396/748 s) and SnO2/rGO (308/448 s, 302/467 s), the response/recovery time ratios of AuNPs-SnO2-rGO sensors for 50 ppm H2S and 50 ppm SOF2 at 110°C were 26/35 s and 41/68 s, respectively. Furthermore, the two direction-resistance changes of the AuNPs-SnO2-rGO sensor when exposed to H2S and SOF2 gas made this sensor a suitable candidate for selective detection of SF6 decomposition components. The enhanced sensing performance can be attributed to the heterojunctions with the highly conductive graphene, SnO2 films and Au nanoparticles.

Keywords: SF6 decomposition components; gas sensor; hybrid nanomaterials; rGO; tin oxide.

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Figures

Figure 1
Figure 1
Schematic diagram of the preparation of AuNPs-SnO2-RGO hybrid.
Figure 2
Figure 2
Measurement system for gas sensing experimental.
Figure 3
Figure 3
XRD spectra of the samples: (A) GO, (B) AuNPs-SnO2-rGO.
Figure 4
Figure 4
(A) Sn3d, (B) Au4f, (C) C1s XPS spectrum for the AuNPs-SnO2-rGO, and (D) C1s XPS spectrum for pristine GO.
Figure 5
Figure 5
Raman Shift of AuNPs-SnO2-rGO and GO.
Figure 6
Figure 6
(a) TEM, (b) HRTEM, (c) SEM, and (d) EDS of AuNPs-SnO2-rGO.
Figure 7
Figure 7
The response of the sensors to 50 ppm SOF2 at the temperature of 30–150°C.
Figure 8
Figure 8
Response recovery curves of the sensor to 50 ppm H2S based on (A) Au/SnO2/RGO, (C) RGO, and (D) SnO2/RGO and the response recovery curves of the sensor to 50 ppm SOF2 based on (B) Au/ SnO2/RGO, (E) RGO, and (F) SnO2/RGO.
Figure 9
Figure 9
Experimental responses and fitting models toward (a) H2S and (c) SOF2 based on Au-SnO2-RGO sensor at 110°C. The response-recovery curves of Au-SnO2-RGO sensor to 5–50 ppm of (b) H2S and (d) SOF2 at 110°C.
Figure 10
Figure 10
Repeatability curve of Au/SnO2/RGO sensor exposed to (a) 50 ppm H2S and (b) 50 ppm SOF2; (c) the long-term stability of Au/SnO2/RGO sensor exposed to 50 ppm H2S and SOF2. (d) selectivity of Au/SnO−2/RGO sensor toward 50 ppm H2S, SO2F2, SOF2, and SO2.
Figure 11
Figure 11
Response values of Au-SnO2-rGO to 50 ppm H2S and SOF2 at different relative humidity. The experiments were performed at 110°C.
Figure 12
Figure 12
Proposed mechanism for the adsorption behavior of H2S and SOF2 molecules on Au-SnO2-rGO.
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