Synthesis of ZnO nanowires and impacts of their orientation and defects on gas sensing properties

ZnO nanowires (NWs) oriented in three different directions were synthesized via the vapor-liquid-solid technique over c-, r- and a-plane sapphire substrates. Gas sensing properties of these samples against reducing and oxidizing gases were examined. ZnO NWs grown on the c-plane substrate showed the...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2016-05
Main Authors: Roso, Sergio, Güell Vilà, Frank, Martínez-Alanis, P. R, Urakawa, Atushi, Llobet, Eduard
Format: Article
Language:English
Subjects:
Detectors de gasos
Gas detectors
Nanotubes
Nanotubs
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Summary:ZnO nanowires (NWs) oriented in three different directions were synthesized via the vapor-liquid-solid technique over c-, r- and a-plane sapphire substrates. Gas sensing properties of these samples against reducing and oxidizing gases were examined. ZnO NWs grown on the c-plane substrate showed the highest response to oxidizing gases (NO2), while those grown on the a-plane substrate were more responsive to reducing one (ethanol). According to the insights gained by photoluminescence studies, the distinct responses were clearly correlated with the quantity and type of defects present in the material, and ultimately, relating the orientation of the different ZnO NWs sensors to their gas sensing characteristics, showing a possible rational strategy to tailor oxide nanomaterials for gas sensing applications.
ISSN:0925-4005