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Title: Study of the effect of the acid-base surface properties of ZnO, Fe{sub 2}O{sub 3} and ZnFe{sub 2}O{sub 4} oxides on their gas sensitivity to ethanol vapor

Binary (ZnO, Fe{sub 2}O{sub 3}) and ternary (ZnFe{sub 2}O{sub 4}) gas-sensitive oxide materials are synthesized, and the correlation between their sensitivity to ethanol vapor and the functional chemical composition of the surface is studied by X-ray photoelectron spectroscopy and by the technique of the adsorption of acid-base indicators. It is found that the sensitivity to ethanol increases with increasing content of Broensted acid sites with the acidity index pK{sub a} Almost-Equal-To 2.5 and with increasing percentage of surface oxygen involved in OH/CO{sub 3}/C-O groups. This interrelation is attributed to the specific features of interaction between ethanol molecules and hydroxyl groups on the surface of the oxides.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. St. Petersburg State Electrotechnical University 'LETI' (Russian Federation)
  2. St. Petersburg State Institute of Technology (Technical University) (Russian Federation)
  3. Tomas Bata University in Zlin (Czech Republic)
Publication Date:
OSTI Identifier:
22210586
Resource Type:
Journal Article
Resource Relation:
Journal Name: Semiconductors; Journal Volume: 47; Journal Issue: 8; Other Information: Copyright (c) 2013 Pleiades Publishing, Ltd.; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ADSORPTION; CHEMICAL COMPOSITION; ETHANOL; FERRITES; INTERACTIONS; IRON OXIDES; SENSITIVITY; SURFACE PROPERTIES; SURFACES; X-RAY PHOTOELECTRON SPECTROSCOPY; ZINC OXIDES