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

  • Chahra Boukaous (a1) (a2), Azzedine Telia (a1), David Horwat (a3), Mohammed Salah Aida (a4), Boubaker Boudine (a4) and Salah Ghanem (a1)...

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.

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

  • Chahra Boukaous (a1) (a2), Azzedine Telia (a1), David Horwat (a3), Mohammed Salah Aida (a4), Boubaker Boudine (a4) and Salah Ghanem (a1)...

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