Room-temperature NH3 Gas Sensing Property of VO2(B)/ZnO Hierarchical Heterogeneous Composite with Nanorod Structure

doi:10.15541/jim20180162

Abstract

Abstract:

VO₂(B)/ZnO nanorods hierarchical heterogeneous composite was synthesized by solution growth method on VO₂(B) nanorods surface. Effects of ZnO seeds’ solution concentration on microstructure and NH₃ gas sensing properties of composite structures were investigated. X-ray diffractometer and scanning electron microscopy were used to characterize the crystal structure and surface morphology of the samples. NH₃ gas sensing properties of the composite was measured by the gas testing system at different temperatures and gas concentrations. The results show that ZnO grows on VO₂(B) surface and changes its shape from nanoparticle to nanorod as the ZnO seeds’ solution concentration increasing from 0.002 mol/L to 0.03 mol/L. ZnO nanorods radially grows on the VO₂(B) nanorod surface and branch-shaped hierarchical heterogeneous VO₂(B)/ZnO composite structures are formed when the solution concentration is 0.01 mol/L. The composite exhibits high gas response and outstanding selectivity at room temperature. The response value reaches 5.6 while the response time is reduced to 2 s at room temperature. This excellent NH₃ gas sensing performance is related to the highly dense VO₂(B)/ZnO hetero-junction and hierarchical structure. The present results may provide more information for design and fabrication of low power and high sensitive NH₃ gas sensors at room temperature.

Key words: VO₂(B) nanorods, ZnO nanorods, metal oxide heterojunction, NH₃ Gas sensors

CLC Number:

O649

LIANG Ji-Ran, ZHANG Ye, YANG Ran, ZHAO Yi-Rui, GUO Jin-Bang. Room-temperature NH₃ Gas Sensing Property of VO₂(B)/ZnO Hierarchical Heterogeneous Composite with Nanorod Structure[J]. Journal of Inorganic Materials, 2018, 33(12): 1323-1329.

Figures/Tables 10

Table 1 Relationship of the amount of solute, the concentration of solution and the sample number

Sample	n(Zn(NO₃)₂•6H₂O)/ mmol	n(C₆H₁₂N₄)/ mmol	c(sol)/ (mol·L^-1)
VZ1	0.4	0.4	0.002
VZ2	1.0	1.0	0.005
VZ3	2.0	2.0	0.010
VZ4	6.0	6.0	0.030

Fig. 1 Schematic structure of the gas sensor

Fig. 2 Test system of gas sensitivity

Fig. 3 XRD patterns of VO2(B) nanorods and VO2(B)/ZnO composite structures

Fig. 4 SEM image (a) and corresponding high magnified image (b) of hydrothermal product VO2 (B) nanorods

Fig. 5 SEM images of VO2(B)/ZnO composite structures with different concentrations of ZnO growth solution(a, b) VZ1; (c, d) VZ2; (e, f) VZ3; (g, h) VZ4

Fig. 6 Gas responses of VO2(B)/ZnO composite structure sensors to 100×10-6 NH3 at different operating temperatures

Fig. 7 Dynamic resistance-time curves of VO2(B)/ZnO composite structure sensors

Fig. 8 Relationship of the response value of VO2/ZnO composite sensors and gas concentrations (a), and high magnification figure of circle parts (b)

Fig. 9 Gas responses of VO2(B)/ZnO composite structure sensors to different gases at room temperature

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Room-temperature NH₃ Gas Sensing Property of VO₂(B)/ZnO Hierarchical Heterogeneous Composite with Nanorod Structure

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