Robust superhydrophobicity of hierarchical ZnO hollow microspheres fabricated by two-step self-assembly

Sun, Ziqi, Liao, Ting, Liu, Kesong, Jiang, Lei, Kim, Jung Ho and Dou, Shi Xue (2013) Robust superhydrophobicity of hierarchical ZnO hollow microspheres fabricated by two-step self-assembly. Nano Research, 6 10: 726-735. doi:10.1007/s12274-013-0350-6

Author Sun, Ziqi
Liao, Ting
Liu, Kesong
Jiang, Lei
Kim, Jung Ho
Dou, Shi Xue
Title Robust superhydrophobicity of hierarchical ZnO hollow microspheres fabricated by two-step self-assembly
Journal name Nano Research   Check publisher's open access policy
ISSN 1998-0124
Publication date 2013-10-01
Year available 2013
Sub-type Article (original research)
DOI 10.1007/s12274-013-0350-6
Open Access Status Not yet assessed
Volume 6
Issue 10
Start page 726
End page 735
Total pages 10
Place of publication Beijing, China
Publisher Tsinghua University Press
Language eng
Abstract Superhydrophobic and superhydrophilic surfaces have been extensively investigated due to their importance for industrial applications. It has been reported, however, that superhydrophobic surfaces are very sensitive to heat, ultraviolet (UV) light, and electric potential, which interfere with their long-term durability. In this study, we introduce a novel approach to achieve robust superhydrophobic thin films by designing architecture-defined complex nanostructures. A family of ZnO hollow microspheres with controlled constituent architectures in the morphologies of 1D nanowire networks, 2D nanosheet stacks, and 3D mesoporous nanoball blocks, respectively, was synthesized via a two-step self-assembly approach, where the oligomers or the constituent nanostructures with specially designed structures are first formed from surfactant templates, and then further assembled into complex morphologies by the addition of a second co-surfactant. The thin films composed of two-step synthesized ZnO hollow microspheres with different architectures presented superhydrophobicities with contact angles of 150°–155°, superior to the contact angle of 103° for one-step synthesized ZnO hollow microspheres with smooth and solid surfaces. Moreover, the robust superhydrophobicity was further improved by perfluorinated silane surface modification. The perfluorinated silane treated ZnO hollow microsphere thin films maintained excellent hydrophobicity even after 75 h of UV irradiation. The realization of environmentally durable superhydrophobic surfaces provides a promising solution for their long-term service under UV or strong solar light irradiations.
Keyword ZnO
Hierarchical structure
Two-step self-assembly
Robust superhydrophobicity
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
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