Synthesis of Three-dimensional Ordered In2O3 Nanowire Arrays and the Effect of Nanostructure Order on Gas Sensitivity

doi:10.7503/cjcu20200782

Abstract

Abstract:

Three-dimensional ordered In₂O₃ nanowire arrays were synthesized using SBA-15 silica as hard template with replication technology， and then the two In₂O₃ samples with different particle sizes were separated with centrifugal separation technology. The crystal structure， grain size， morphology and bandgap of both samples were characterized by means of XRD， SEM and UV-Vis spectroscopy. Both In₂O₃ samples present three-dimensional nanowire array structures， which are orderly assembled with the spherical In₂O₃ particles with grain size of 12 nm. The diameter and interwire distance of In₂O₃ nanowires is about 12 nm and 2 nm， respectively， while the bandgap of In₂O₃ nanowires with the larger particle size is slightly larger than that with the smaller particle size. The sensitivity of In₂O₃ nanowires with the larger particle_{size reaches up to 50. 6 to the ethanol gas with volume ratios of 100×10^-6 in air at 320 ℃， which is higher than that with the smaller particle size. Finally， the gas-sensing performance of In₂O₃ nanowires with the larger particle is obviously better than those of the similar nanoparticles and mesoporous nanostructures， indicating that the order degree of In₂O₃ nanowire greatly affects the gas-sensing properties of nanostructures.}

Key words: Three-dimensional ordered nanowire array, Order degree of nanostructure, Gas sensitivity

CLC Number:

O611

TrendMD:

SUN Hao, GONG Jie, YANG Yan, WANG Xinqing, CHEN Huidong. Synthesis of Three-dimensional Ordered In₂O₃ Nanowire Arrays and the Effect of Nanostructure Order on Gas Sensitivity[J]. Chem. J. Chinese Universities, 2021, 42(6): 1730.

Figures/Tables 6

References 25

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Sample	Particle size/nm	Volume ratio of ethanol in air	Optimum temperature/℃	Sensitivity	Ref.
In₂O₃ nano particles	11.59	50×10^-6	300	6	[25]
In₂O₃ mesoporous nanoparticles	14.2	50×10^-6	300	17	[22]
		100×10^-6		19.7	[22]
In₂O₃ nanowire arrays, Sample B	12	50×10^-6	320	25.4	This work
		100×10^-6		38.8
In₂O₃ nanowire arrays, Sample A	12	50×10^-6	320	36.6	This work
		100×10^-6		50. 6

Sample	Particle size/nm	Volume ratio of ethanol in air	Optimum temperature/℃	Sensitivity	Ref.
In₂O₃ nano particles	11.59	50×10^-6	300	6	[25]
In₂O₃ mesoporous nanoparticles	14.2	50×10^-6	300	17	[22]
		100×10^-6		19.7	[22]
In₂O₃ nanowire arrays, Sample B	12	50×10^-6	320	25.4	This work
		100×10^-6		38.8
In₂O₃ nanowire arrays, Sample A	12	50×10^-6	320	36.6	This work
		100×10^-6		50. 6

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Synthesis of Three-dimensional Ordered In₂O₃ Nanowire Arrays and the Effect of Nanostructure Order on Gas Sensitivity

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