Superhydrophobic/superhydrophilic switching on the surface of ZnO microstructures caused by UV irradiation and argon ion etching process

摘要

ZnO microstructures of different morphology were investigated using the water contact angle (WCA) analysis. The as-grown ZnO microstructures were found to exhibit pure hydrophobic behavior, which is enhanced with the increase of their surface area. The most hydrophobic structures (WCA = 157°) were found to be the complex microoctapods, containing both the macro-and nanoscale features.