Significant Improvement of CO Sensing Performance Based on Au-sensitized Double-shelled SnO2 Hollow Nanocubes†

doi:10.7503/cjcu20180487

Abstract

Abstract:

Based on the unique structural merits of hollow interior, hierarchical nanoparticle-assembled and permeable double shells, the CO sensing performance of double-shelled SnO₂ nanocubes can be further promoted by the sensitization of the loaded Au nanoparticles. The crystallinity, morphology and structure of pure and Au-loaded SnO₂ hollow nanocubes(HNCs) are detailedly characterized and the results certify that the less-agglomerated configuration of Au-loaded SnO₂ is still reserved. Furthermore, the CO sensing performances of pure and Au-loaded SnO₂ HNCs demonstrate that Au-loaded SnO₂ exhibits a high response value of 20.9 to 24.7 mg/m³(20 ppm) CO at the optimal working temperature of 220 ℃, which is significantly higher than that of pure SnO₂. Besides their structural merits, the significant improvement of CO sensing properties can be attributed to the sensitized promotion of noble Au.

Key words: Tin oxide, Au, Multilayered nanostructures, Catalytic activation, Gas sensor

CLC Number:

O614

TrendMD:

MA Junfeng,ZENG Yi. Significant Improvement of CO Sensing Performance Based on Au-sensitized Double-shelled SnO₂ Hollow Nanocubes^†[J]. Chem. J. Chinese Universities, 2018, 39(9): 1867.

Figures/Tables 6

Fig.1 XRD patterns of pure SnO2 HNCs(a) and Au-loaded SnO2 HNCs(b)

Fig.2 FESEM images(A—C) and TEM image(D) of pure SnO2 HNCs Insets in (C) and (D) are the typical SAED pattern and HRTEM image, respectively.

Fig.3 Typical FESEM(A), TEM(B, C) and HRTEM(D) images of Au-loaded SnO2 HNCsInsets are the enlarged FESEM(A) and TEM(D) images of Au-loaded SnO2 HNCs.

Fig.4 EDX(A) and nitrogen adsorption/desorption isotherms with pore-size distribution(B) of pure and Au-loaded SnO2 HNCsa. Unloaded SnO2; b. Au-loaded SnO2.

Fig.5 Temperature-dependent response and selectivity curves(A, B), concentration-dependent response(C, D) of pure and Au-loaded SnO2 HNCs, dynamic response transients and the response-recovery time of Au-loaded SnO2 HNCs(E, F)(A) a. Au-loaded SnO2; b. pure SnO2; (C, D) a. Au-loaded(220 ℃); b. unloaded(300 ℃).

Fig.6 Schematic diagram of CO sensing process and mechanism of Au-loaded SnO2 HNCs

References 18

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Significant Improvement of CO Sensing Performance Based on Au-sensitized Double-shelled SnO₂ Hollow Nanocubes^†

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