Preparation of p-CuO/n-In2O3 Heterojunction Nanofibers and Their Gas Sensing Properties†

doi:10.7503/cjcu20170112

Abstract

Abstract:

p-CuO/n-In₂O₃ heterojunction nanofibers were prepared by solvothermal method using electrospun In₂O₃ nanofibers as template. The surface morphologies and microstructures of the composite nanofibers were characterized by field emission scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). It was found that the In₂O₃ nanofibers were uniformly decorated with CuO nanoparticles, and the surface densities of CuO nanoparticles could be controlled by varing the precursor concentration of cupric acetate. Side-heated gas sensors were prepared based on these composite nanofiers. The p-CuO/n-In₂O₃ heterojunction nanofibers exhibited high gas responses and low operating temperature for detecting H₂S gas compared with pure In₂O₃ nanofibers.

Key words: Nanofibers, CuO/In2O3, p-n Junction, Gas sensor

CLC Number:

O614
O649

TrendMD:

WANG Mo, LI Xiaowei, SHAO Changlu, ZHAO Yingqian, XIN Jiayu, HAN Chaohan, LI Xinghua, LIU Yichun. Preparation of p-CuO/n-In₂O₃ Heterojunction Nanofibers and Their Gas Sensing Properties^†[J]. Chem. J. Chinese Universities, 2017, 38(9): 1524.

Figures/Tables 9

Table 1 Precursors used for the preparation of different samples and the molar ratio of In2O3 and CuO in the products

Sample	Copper acetate added/g	Urea added/g	CuO/In₂O₃ molar ratio in product
S1	0.156	0.096	2.35
S2	0.260	0.160	1.65
S3	0.416	0.256	1.50
S4	0.520	0.320	1.20

Fig.1 SEM images of In2O3 nanofibers(A, B) and samples S1(C), S2(D), S3(E) and S4(F)

Fig.2 TEM(A) and HRTEM(B) images of sample S2

Fig.3 XRD patterns of In2O3(a), S1(b), S2(c), S3(d) and S4(e)

Fig.4 XPS spectra of CuO/In2O3 nanofibers(A) Full spectrum; (B) O1s; (C) In3d; (D) Cu2p.

Fig.5 Responses of gas sensors based on In2O3 and CuO/In2O3 composite hetero-nanofibers to 138 mg/m3 H2S at different temperatures

Fig.6 Sensitivity response of the gas sensor based on In2O3 and CuO/In2O3 composite hetero-nanofiber versus the concentration of H2S

Fig.7 Sensing transients of gas sensor based on S2 to 0.69—138 mg/m3 H2S at 100 ℃

Fig.8 Sensitivity of gas sensor based on In2O3 and S2 to different gases at 100 ℃

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Preparation of p-CuO/n-In₂O₃ Heterojunction Nanofibers and Their Gas Sensing Properties^†

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