Rumyantseva, M. N., Vladimirova, S. A., Vorobyeva, N. A., Giebelhaus, I., Mathur, S., Chizhov, A. S., Khmelevsky, N. O., Aksenenko, A. Yu., Kozlovsky, V. F., Karakulina, O. M., Hadermann, J., Abakumov, A. M. and Gaskov, A. M. (2018). p-CoOx/n-SnO2 nanostructures: New highly selective materials for H2S detection. Sens. Actuator B-Chem., 255. S. 564 - 572. LAUSANNE: ELSEVIER SCIENCE SA. ISSN 0925-4005

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Abstract

Nanostructures p-CoOx/n-SnO2 based on tin oxide nanowires have been prepared by two step CVD technique and characterized in detail by XRD, XRF, XPS, HAADF-STEM imaging and EDX-STEM mapping. Depending on the temperature of decomposition of cobalt complex during the second step of CVD synthesis of nanostructures cobalt oxide forms a coating and/or isolated nanoparticles on SnO2 nanowire surface. It was found that cobalt presents in +2 and +3 oxidation states. The measurements of gas sensor properties have been carried out during exposure to CO (14 ppm), NH3 (21 ppm), and H2S (2 ppm) in dry air. The opposite trends were observed in the effect of cobalt oxide on the SnO2 gas sensitivity when detecting CO or NH3 in comparison to H2S. The decrease of sensor signal toward CO and NH3 was attributed to high catalytic activity of Co3O4 in oxidation of these gases. Contrary, the significant increase of sensor signal in the presence of H2S was attributed to the formation of metallic cobalt sulfide and removal of the barrier between p-CoOx and n-SnO2. This effect provides an excellent selectivity of p-CoOx/n-SnO2 nanostructures in H2S detection. (C) 2017 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Rumyantseva, M. N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vladimirova, S. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vorobyeva, N. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Giebelhaus, I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mathur, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chizhov, A. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Khmelevsky, N. O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Aksenenko, A. Yu.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kozlovsky, V. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Karakulina, O. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hadermann, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Abakumov, A. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gaskov, A. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-196708
DOI: 10.1016/j.snb.2017.08.096
Journal or Publication Title: Sens. Actuator B-Chem.
Volume: 255
Page Range: S. 564 - 572
Date: 2018
Publisher: ELSEVIER SCIENCE SA
Place of Publication: LAUSANNE
ISSN: 0925-4005
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SENSING PROPERTIES; COBALT-OXIDE; CARBON-MONOXIDE; SNO2 FILMS; GAS; CO; OXIDATION; NANOWIRE; SENSOR; COPPERMultiple languages
Chemistry, Analytical; Electrochemistry; Instruments & InstrumentationMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/19670

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