Surface Wrinkling with Memory for Programming Adhesion and Wettability
Wang, Feng; Xiao, Senbo; Luo, Sihai; Fu, Yuequn; Skallerud, Bjørn Helge; Kristiansen, Helge; cui, mengkui; zhong, chao; Liu, Siqi; Zhuo, Yizhi; He, Jianying; Zhang, Zhiliang
Peer reviewed, Journal article
Published version
Permanent lenke
https://hdl.handle.net/11250/3059531Utgivelsesdato
2023Metadata
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Originalversjon
10.1021/acsanm.2c05410Sammendrag
Modulating surface wrinkling is important for a variety of engineering applications. It has been known for more than two decades that the wavelength of surface wrinkles occurring in a metal film–soft polymer system scales linearly with the deposited film thickness. In the current experimental study of ultrathin gold film (0.2–8 nm) deposition on polydimethylsiloxane (PDMS), an unexplored thickness-dependent wrinkling phenomenon is found. By manipulating the deposition sequence as a degree of freedom for tailoring surface topography, we discovered a morphology memory effect where the wrinkle evolution in the subsequent deposition step inherits the surface pattern already formed in the previous step. Moreover, a stepwise deposition targeting 1 nm thick film can lead to 1 order of magnitude higher surface roughness than the one in the continuous deposition. By programming the sequences within 8 nm Au deposition, a surface strain map varying drastically from 0.2% to 27% is realized. Instructed by the strain map, we show the great potentials of tailored wrinkles in alternating surface wettability, enhancing surface Raman scattering, and on-demand tuning of surface adhesion. Surface Wrinkling with Memory for Programming Adhesion and Wettability