Sub-ppm H2S sensing by tubular ZnO-Co3O4 nanofibers

•Cobalt containing electrospun ZnO nanofibers acquire a tubular structure.•Walls of the tubes are formed by agglomerated wurtzite Zn1-yCoyO nanoparticles.•Spinel ZnxCo3-xO4 nanoparticles are located on the outer surface of Zn1-yCoyO tubes.•Tuning of sensor properties is based on change in the ZnO ac...

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Published inSensors and actuators. B, Chemical Vol. 307; p. 127624
Main Authors Rumyantseva, M.N., Vladimirova, S.A., Platonov, V.B., Chizhov, A.S., Batuk, M., Hadermann, J., Khmelevsky, N.O., Gaskov, A.M.
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 15.03.2020
Elsevier Science Ltd
Subjects
Acetates
Cobalt acetates
Cobalt oxides
Cobalt sulfide
Electron states
Electrospinning
Hydrogen sulfide
Mapping
Metal oxide composites
Nanofibers
Nitrogen dioxide
Phase composition
Recovery time
Semiconductor gas sensor
Sensitivity
Tubular structure
X ray photoelectron spectroscopy
Zinc oxide
Tubular structure
Electrospinning
Metal oxide composites
Nanofibers
Semiconductor gas sensor
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Abstract •Cobalt containing electrospun ZnO nanofibers acquire a tubular structure.•Walls of the tubes are formed by agglomerated wurtzite Zn1-yCoyO nanoparticles.•Spinel ZnxCo3-xO4 nanoparticles are located on the outer surface of Zn1-yCoyO tubes.•Tuning of sensor properties is based on change in the ZnO acidity cobalt doping.•Removal of p – n junction provides excellent selectivity of ZnO-CoOx in H2S sensing. Tubular ZnO – Co3O4 nanofibers were co-electrospun from polymer solution containing zinc and cobalt acetates. Phase composition, cobalt electronic state and element distribution in the fibers were investigated by XRD, SEM, HRTEM, HAADF-STEM with EDX mapping, and XPS. Bare ZnO has high selective sensitivity to NO and NO2, while ZnO-Co3O4 composites demonstrate selective sensitivity to H2S in dry and humid air. This effect is discussed in terms of transformation of cobalt oxides into cobalt sulfides and change in the acidity of ZnO oxide surface upon cobalt doping. Reduction in response and recovery time is attributed to the formation of a tubular structure facilitating gas transport through the sensitive layer.
AbstractList •Cobalt containing electrospun ZnO nanofibers acquire a tubular structure.•Walls of the tubes are formed by agglomerated wurtzite Zn1-yCoyO nanoparticles.•Spinel ZnxCo3-xO4 nanoparticles are located on the outer surface of Zn1-yCoyO tubes.•Tuning of sensor properties is based on change in the ZnO acidity cobalt doping.•Removal of p – n junction provides excellent selectivity of ZnO-CoOx in H2S sensing. Tubular ZnO – Co3O4 nanofibers were co-electrospun from polymer solution containing zinc and cobalt acetates. Phase composition, cobalt electronic state and element distribution in the fibers were investigated by XRD, SEM, HRTEM, HAADF-STEM with EDX mapping, and XPS. Bare ZnO has high selective sensitivity to NO and NO2, while ZnO-Co3O4 composites demonstrate selective sensitivity to H2S in dry and humid air. This effect is discussed in terms of transformation of cobalt oxides into cobalt sulfides and change in the acidity of ZnO oxide surface upon cobalt doping. Reduction in response and recovery time is attributed to the formation of a tubular structure facilitating gas transport through the sensitive layer.
Tubular ZnO – Co3O4 nanofibers were co-electrospun from polymer solution containing zinc and cobalt acetates. Phase composition, cobalt electronic state and element distribution in the fibers were investigated by XRD, SEM, HRTEM, HAADF-STEM with EDX mapping, and XPS. Bare ZnO has high selective sensitivity to NO and NO2, while ZnO-Co3O4 composites demonstrate selective sensitivity to H2S in dry and humid air. This effect is discussed in terms of transformation of cobalt oxides into cobalt sulfides and change in the acidity of ZnO oxide surface upon cobalt doping. Reduction in response and recovery time is attributed to the formation of a tubular structure facilitating gas transport through the sensitive layer.
ArticleNumber 127624
Author Hadermann, J.
Khmelevsky, N.O.
Vladimirova, S.A.
Gaskov, A.M.
Batuk, M.
Rumyantseva, M.N.
Platonov, V.B.
Chizhov, A.S.
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Snippet •Cobalt containing electrospun ZnO nanofibers acquire a tubular structure.•Walls of the tubes are formed by agglomerated wurtzite Zn1-yCoyO...
Tubular ZnO – Co3O4 nanofibers were co-electrospun from polymer solution containing zinc and cobalt acetates. Phase composition, cobalt electronic state and...
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StartPage 127624
SubjectTerms Acetates
Cobalt acetates
Cobalt oxides
Cobalt sulfide
Electron states
Electrospinning
Hydrogen sulfide
Mapping
Metal oxide composites
Nanofibers
Nitrogen dioxide
Phase composition
Recovery time
Semiconductor gas sensor
Sensitivity
Tubular structure
X ray photoelectron spectroscopy
Zinc oxide
Title Sub-ppm H2S sensing by tubular ZnO-Co3O4 nanofibers
URI https://dx.doi.org/10.1016/j.snb.2019.127624
https://www.proquest.com/docview/2375481188/abstract/
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