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ZnO nanorods arrays were prepared on soda lime glass substrate by pulsed laser deposition method. Hexagonal rod-like ZnO rods were obtained under different conditions. Well-defined ZnO nanorods arrays were selected among different samples having various morphologies and sizes already studied by X-ray diffraction (XRD) and atomic force microscopy (AFM). Here, we report on the contact angle measurement (CAM) of one of these samples. A systematic change of the surface wettability is observed in W-doped ZnO nanostructures. The water contact angle (WCA) of a 1 wt.% of WO3 target content was found to be the transition doping level from hydrophilic surface to a hydrophobic surface. We attributed the transition in surface wettability of the film with the doping to incorporation increase of tungsten into the film. Such characteristic surface wettability can play a key role in the adhesion of various layers on W-ZnO nanorods arrays for optoelectronic device applications.
Zirconium oxide thin films were deposited by sputtering a ZrO2 target
under an argon-oxygen gas mixture and different total gas pressures. Their
composition, structure and optical constants were characterised by mean of
Auger profiles, XRD, XPS, m-line and UV-visible spectroscopies. All the
deposits were found to be sub-stoechiometric with O/Zr ratio decreasing from
1.6 to 1.45 when the deposition pressure increased from 0.01 to 0.05 Torr. A
SRIM simulation was used to explain this behaviour. The XRD showed a
monoclinic phase for all sample with different grain size and residual
stress. Finally, the optical constants were determined. The refractive index
decreased slightly when the deposition pressure increased whereas the
optical gap and the Urbach energy were found to be quite constant whatever
the sputtering pressure.
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