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Influence of solvent on humidity sensing of sol-gel deposited ZnO thin films

Published online by Cambridge University Press:  03 February 2014

Chahra Boukaous ,
Azzedine Telia ,
David Horwat ,
Mohammed Salah Aida ,
Boubaker Boudine  and
Salah Ghanem
Chahra Boukaous*
Affiliation:
Laboratoire Microsystème et Instrumentation, Département d’électronique, Université de Constantine 1, route d’Ain El Bey, 25000 Constantine, Algeria Laboratoire Microstructure et Défauts dans les Matériaux, Département de physique, Université de Constantine 1, route d’Ain El Bey, 25000 Constantine, Algeria
Azzedine Telia
Affiliation:
Laboratoire Microsystème et Instrumentation, Département d’électronique, Université de Constantine 1, route d’Ain El Bey, 25000 Constantine, Algeria
David Horwat
Affiliation:
Institut Jean Lamour, Département CP2S, UMR 7198 CNRS-Nancy-Université-UPV-Metz, École des Mines de Nancy, Parc de Saurupt, CS14234, 54042 Nancy, France
Mohammed Salah Aida
Affiliation:
Département de physique, Université de Constantine 1, route d’Ain El Bey, 25000 Constantine, Algeria
Boubaker Boudine
Affiliation:
Département de physique, Université de Constantine 1, route d’Ain El Bey, 25000 Constantine, Algeria
Salah Ghanem
Affiliation:
Laboratoire Microsystème et Instrumentation, Département d’électronique, Université de Constantine 1, route d’Ain El Bey, 25000 Constantine, Algeria
*
ae-mail: [email protected]
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Abstract

Undoped zinc oxide (ZnO) thin films have been grown on glass substrates by sol-gel process associated with dip coating. Two different solvents are used such as: 2-methoxyethanol and ethanol. The influence of these solvents on structural and optical properties of ZnO thin films has been investigated. Crystallinity and surface morphology of ZnO films are analyzed using X-ray diffractometry (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The optical properties are characterized by ultraviolet-visible (UV-vis) and photoluminescence spectroscopy (PL). Humidity sensors have been prepared with deposited ZnO films. Results reveal that ZnO thin film synthesized with 2-methoxyethanol showed a better crystalline quality and ultraviolet emission performance. In addition, a smaller transmittance in visible range and a higher surface roughness are observed. Sensing humidity test exhibits better sensitivity for sensor prepared with film deposited using 2-methoxyethanol as solvent.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 65 , Issue 2 , February 2014 , 20302
Copyright
© EDP Sciences, 2014

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