Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2017-08-01

Journal: SENSORS

Included Journals: PubMed、EI、SCIE、Scopus

Volume: 17

Issue: 8

ISSN: 1424-8220

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

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 degrees 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.