A fast and effective approach for reversible wetting-dewetting transitions on ZnO nanowires.

ABSTRACT: Here, we demonstrate a facile approach for the preparation of ZnO nanowires (NWs) with tunable surface wettability that can be manipulated reversibly in a controlled manner from a superhydrophilic state to a superhydrophobic state. The as-synthesized ZnO NWs obtained by a chemical vapor deposition method are superhydrophilic with a contact angle (CA) value of ~0°. After H₂ gas annealing at 300 °C for 90 minutes, ZnO NWs display superhydrophobic behavior with a roll-off angle less than 5°. However, O₂ gas annealing converts these superhydrophobic ZnO NWs into a superhydrophilic state. For switching from superhydrophobic to superhydrophilic state and vice versa in cyclic manner, H₂ and O₂ gas annealing treatment was used, respectively. A model base

SUBMITTER: Yadav K 

PROVIDER: S-EPMC5054356 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature