Publication
Title
Nanocrystalline ZnO(Ga) : paramagnetic centers, surface acidity and gas sensor properties
Author
Abstract
Nanocrystalline ZnO and ZnO(Ga) samples with different gallium content were prepared by wet-chemical method. Introduction of gallium leads to the increase of amount of weak acid sites such as surface hydroxyl groups. Gas sensing properties toward 0.22 ppm H2S and NO2 were studied at 100450 °C by DC conductance measurements. The optimal temperature for gas sensing experiments was determined. Sensor signal toward H2S decreases with increase of Ga concentration. The dependence of ZnO(Ga) sensor signal to NO2 on the gallium content has non-monotonous character, which correlates with the change of conductivity of the samples in air and concentration of paramagnetic donor states.
Language
English
Source (journal)
Sensors and actuators : B : chemical. - Lausanne
Publication
Lausanne : 2013
ISSN
0925-4005
Volume/pages
182(2013), p. 555-564
ISI
000319488800075
Full text (Publisher's DOI)
Full text (publisher's version - intranet only)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 17.04.2013
Last edited 21.10.2017
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