The preparation and the wettability study of the copper nano-structure surface

We prepared a superhydriphilic film on copper by a facile hydrothermal method,the water contact angle was 6°.After modified with fluoride,the surface exhibits superhydrophobicity and the water contact angle can reach 156°,the sliding angle less than 10°.The result of the XRD patterns confirms that the nano-structure was cupric oxide.The SEM shows that the morphology rely on the temperature and reaction time.The airs among the nano structures and the fluoride lead to the superhydrophobicity.When the film was put down the water with varies height,the superhydrophobicity was changed even to a superhydrophilicity.The reason of the change was discussed briefly.