Electrospinning Hetero-Nanofibers In₂O₃/SnO₂ of Homotype Heterojunction with High Gas Sensing Activity

Haiying Du; PengJun Yao; Yanhui Sun; Jing Wang; Huisheng Wang; Naisen Yu

doi:10.3390/s17081822

Electrospinning Hetero-Nanofibers In₂O₃/SnO₂ of Homotype Heterojunction with High Gas Sensing Activity

Sensors (Basel). 2017 Aug 9;17(8):1822. doi: 10.3390/s17081822.

Authors

Haiying Du^{1

2

3}, PengJun Yao⁴, Yanhui Sun^{5

6}, Jing Wang⁷, Huisheng Wang⁸, Naisen Yu⁹

Affiliations

¹ College of mechanical and Electronic Engineering, Dalian Minzu University, Dalian 116600, China. duhaiying@dlnu.edu.cn.
² School of Electronic Science and Technology, Dalian University of Technology, Dalian 116023, China. duhaiying@dlnu.edu.cn.
³ Department of Electrical and Computer Engineering, College of Engineering, Iowa State University, Ames, IA 50011, USA. duhaiying@dlnu.edu.cn.
⁴ School of Educational Technology, Shenyang Normal University, Shenyang 110034, China. yaopj@synu.edu.cn.
⁵ College of mechanical and Electronic Engineering, Dalian Minzu University, Dalian 116600, China. syh@dlnu.edu.cn.
⁶ School of Electronic Science and Technology, Dalian University of Technology, Dalian 116023, China. syh@dlnu.edu.cn.
⁷ School of Electronic Science and Technology, Dalian University of Technology, Dalian 116023, China. wangjing@dlut.edu.cn.
⁸ School of Electronic Science and Technology, Dalian University of Technology, Dalian 116023, China. 13204115731@163.com.
⁹ School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116600, China. yunaisen@dlnu.edu.cn.

Abstract

In₂O₃/SnO₂ composite hetero-nanofibers were synthesized by an electrospinning technique for detecting indoor volatile organic gases. The physical and chemical properties of In₂O₃/SnO₂ hetero-nanofibers were characterized and analyzed by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), Energy Dispersive X-Ray Spectroscopy (EDX), specific surface Brunauer-Emmett-Teller (BET) and X-ray photoelectron spectroscopy (XPS). Gas sensing properties of In₂O₃/SnO₂ composite hetero-nanofibers were measured with six kinds of indoor volatile organic gases in concentration range of 0.5~50 ppm at the operating temperature of 275 °C. The In₂O₃/SnO₂ composite hetero-nanofibers sensor exhibited good formaldehyde sensing properties, which would be attributed to the formation of n-n homotype heterojunction in the In₂O₃/SnO₂ composite hetero-nanofibers. Finally, the sensing mechanism of the In₂O₃/SnO₂ composite hetero-nanofibers was analyzed based on the energy-band principle.

Keywords: composite hetero-nanofibers; electrospinning; gas sensing mechanism; gas sensing properties; homotype heterojunction; indoor volatile organic gases.