We report here the wetting behaviors of nanostructured N-polar GaN wafers. The nanostructured GaN samples were obtained by wet photochemical etching under UV illumination. It is confirmed that the wetting behavior of the nanostructured N-polar GaN surfaces follows the Wenzel model. Both surface roughening and decoration with Au nanoparticles will reduce the contact angle (CA), while modification with lauric acid will increase hydrophobility with CAs that change from 42.1 degrees to 129.5 degrees. Besides, the nanostructured surface shows high contact angle hysteresis due to strong static friction that can reach similar to 15 mJ/m(2). (C) 2017 Elsevier B.V. All rights reserved.