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Indexed by:期刊论文

Date of Publication:2017-08-01

Journal:SENSORS

Included Journals:Scopus、SCIE、EI、PubMed

Volume:17

Issue:8

ISSN No.: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.