title: Superhydrophobic multi-scale ZnO nanostructures fabricated by chemical vapor deposition method.
abstract: The ZnO nanostructures were synthesized on Si(100) substrates by chemical vapor deposition (CVD) method. Different Morphologies of ZnO nanostructures, such as nanoparticle film, micro-pillar and micro-nano multi-structure, were obtained with different conditions. The results of XRD and TEM showed the good quality of ZnO crystal growth. Selected area electron diffraction analysis indicates the individual nano-wire is single crystal. The wettability of ZnO was studied by contact angle admeasuring apparatus. We found that the wettability can be changed from hydrophobic to super-hydrophobic when the structure changed from smooth particle film to single micro-pillar, nano-wire and micro-nano multi-scale structure. Compared with the particle film with contact angle (CA) of 90.7 degrees, the CA of single scale microstructure and sparse micro-nano multi-scale structure is 130-140 degrees, 140-150 degrees respectively. But when the surface is dense micro-nano multi-scale structure such as nano-lawn, the CA can reach to 168.2 degrees . The results indicate that microstructure of surface is very important to the surface wettability. The wettability on the micro-nano multi-structure is better than single-scale structure, and that of dense micro-nano multi-structure is better than sparse multi-structure.
authors.affiliation: Center for Photonic Fabrication, Institute of Science Research, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China.
authors.forename: Ming
authors.initials: M
authors.lastname: Zhou
authors.forename: Chengheng
authors.initials: C
authors.lastname: Feng
authors.forename: Chunxia
authors.initials: C
authors.lastname: Wu
authors.forename: Weiwei
authors.initials: W
authors.lastname: Ma
authors.forename: Lan
authors.initials: L
authors.lastname: Cai