title: Bioinspired multifunctional Au nanostructures with switchable adhesion.
abstract: Inspired by the self-cleaning of cicada wings, well-aligned Au-coated Ni nanocone arrays (Au@Ni NAs) have been fabricated by a simple and cheap electrodeposition method. After surface modification of n-hexadecanethiol, self-cleaning can be realized on this long-lived superhydrophobic surface with extremely low adhesive force. Switchable adhesion is obtained on its complementary porous surface. The porous Au structure is fabricated by a geometric replica of the nanocone arrays. After the same surface modification, it shows superhydrophobicity with high adhesion. The different adhesive behaviors on the two lock-and-key Au structures are ascribed to their different contact modes with a water droplet. Combining the superhydrophobic properties of the two complementary structures, they can be used to transport precious microdroplets without any loss. The bioinspired periodic Au@Ni NAs can also be potentially employed as surface-enhanced Raman scattering (SERS) substrates due to its electromagnetic enhancement effect, especially at the tips of the nanocones. Thus, superhydrophobic, SERS, long-lived, self-cleaning, microtransportation functions are realized on the basis of the two surfaces.
authors.affiliation: State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University , No. 800 Dongchuan Road, Shanghai 200240, China.
authors.forename: Xiu
authors.initials: X
authors.lastname: Mo
authors.affiliation: State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University , No. 800 Dongchuan Road, Shanghai 200240, China.
authors.forename: Yunwen
authors.initials: Y
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University , No. 800 Dongchuan Road, Shanghai 200240, China.
authors.forename: Junhong
authors.initials: J
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University , No. 800 Dongchuan Road, Shanghai 200240, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Hang
authors.affiliation: State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University , No. 800 Dongchuan Road, Shanghai 200240, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Li
mesh_terms: D000268:Adhesiveness; D006046:Gold / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D049329:Nanostructures / Q000737:chemistry*; D013499:Surface Properties; D014961:X-Ray Diffraction
chemical_list: D006046:Gold