The European Physical Journal Applied Physics

Photonics

Photon-induced tunable and reversible wettability of pulsed laser deposited W-doped ZnO nanorods

B.D. Ngoma1a2 c1, O. Sakhoa1, S. Ndiayea1, R. Bartalia3, A. Dialloa1, M.B. Gayea1, S. Badya1, N. Manyalaa4, M. Maazaa2 and A.C. Beyea1

Groupes de Physique du Solide et Sciences des Matériaux (GPSSM), Faculté des sciences et Techniques, Université Cheikh Anta Diop de Dakar (UCAD), B.P. 25114, Dakar-Fann, Dakar, Senegal

NANO-Sciences Laboratories, Materials Research Department, iThemba LABS, National Research Foundation, South Africa

Fondazione Bruno Kessler – Centro Materiali e Microsistemi, Plasma and Advanced Material, Bio-MEMS, Via Sommarive 18, 38050 Povo, Trento, Italy

Department of Physics, Institute of Applied Materials, University of Pretoria, Pretoria, 0002, South Africa

Abstract

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.

(Received July 20 2010)

(Revised October 06 2010)

(Accepted March 24 2011)

(Online publication August 11 2011)

Correspondence:

c1 e-mail: ngom@emt.inrs.ca; bdngom@gmail.com

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