Effect of heat treatment on surface structure and gas sensing of electrospun ZnO‐SnO2 composite nanofibers

ZnO‐SnO2 composite nanofibers with a constant Zn/Sn ratio of 0.4 have been electrospun and calcined at 650°C in ambient air, followed then by heat treatment at 350°C in either air, 5% H2‐95% N2, or 15 ppm H2S‐air atmosphere for comparison of gas‐sensing behaviors. The nanofibers being heat‐treated i...

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Published in:International journal of applied ceramic technology 2021-05, Vol.18 (3), p.653-660
Main Authors: Wu, Fengyu Y., Tseng, Wenjea J.
Format: Article
Language:English
Subjects:
Electrospinning
gas sensor
Gas sensors
H2S
Heat treatment
Hydrogen sulfide
nanofiber
Nanofibers
Nitrogen dioxide
Oxygen enrichment
Redox reactions
Roasting
SnO2
Surface structure
Tin dioxide
Zinc oxide
ZnO
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Tseng, Wenjea J.
description ZnO‐SnO2 composite nanofibers with a constant Zn/Sn ratio of 0.4 have been electrospun and calcined at 650°C in ambient air, followed then by heat treatment at 350°C in either air, 5% H2‐95% N2, or 15 ppm H2S‐air atmosphere for comparison of gas‐sensing behaviors. The nanofibers being heat‐treated in the H2S‐air atmosphere display a sensing response more than 25 times than the as‐calcined counterpart, that is, the sensing response increases from 20 to 514 against a model NO2 gas of 10 ppm concentration at a working temperature of 180°C. This appears to be attributable to the formation of sulfate on the nanofiber surface, which resulted in an enriched oxygen vacancy and chemisorbed oxygen near the surface for facilitating the redox reaction toward NO2 gas molecules. The facile heat treatment in the presence of dilute H2S concentration may have opened up an alternative route for enhancing the surface‐sensitive gas‐sensor activity. Morphology, NO2 sensing response, and sensing mechanisms of the ZnO‐SnO2 composites.
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The nanofibers being heat‐treated in the H2S‐air atmosphere display a sensing response more than 25 times than the as‐calcined counterpart, that is, the sensing response increases from 20 to 514 against a model NO2 gas of 10 ppm concentration at a working temperature of 180°C. This appears to be attributable to the formation of sulfate on the nanofiber surface, which resulted in an enriched oxygen vacancy and chemisorbed oxygen near the surface for facilitating the redox reaction toward NO2 gas molecules. The facile heat treatment in the presence of dilute H2S concentration may have opened up an alternative route for enhancing the surface‐sensitive gas‐sensor activity. 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The nanofibers being heat‐treated in the H2S‐air atmosphere display a sensing response more than 25 times than the as‐calcined counterpart, that is, the sensing response increases from 20 to 514 against a model NO2 gas of 10 ppm concentration at a working temperature of 180°C. This appears to be attributable to the formation of sulfate on the nanofiber surface, which resulted in an enriched oxygen vacancy and chemisorbed oxygen near the surface for facilitating the redox reaction toward NO2 gas molecules. The facile heat treatment in the presence of dilute H2S concentration may have opened up an alternative route for enhancing the surface‐sensitive gas‐sensor activity. 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subjects Electrospinning
gas sensor
Gas sensors
H2S
Heat treatment
Hydrogen sulfide
nanofiber
Nanofibers
Nitrogen dioxide
Oxygen enrichment
Redox reactions
Roasting
SnO2
Surface structure
Tin dioxide
Zinc oxide
ZnO
title Effect of heat treatment on surface structure and gas sensing of electrospun ZnO‐SnO2 composite nanofibers
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