Title
Nanocrystalline ZnO(Ga) : paramagnetic centers, surface acidity and gas sensor propertiesNanocrystalline ZnO(Ga) : paramagnetic centers, surface acidity and gas sensor properties
Author
Faculty/Department
Faculty of Sciences. Physics
Research group
Electron microscopy for materials research (EMAT)
Publication type
article
Publication
Lausanne,
Subject
Physics
Chemistry
Source (journal)
Sensors and actuators : B : chemical. - Lausanne
Volume/pages
182(2013), p. 555-564
ISSN
0925-4005
ISI
000319488800075
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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.
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