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Large‐Area, Periodic, Hexagonal Wrinkles on Nanocrystalline Graphitic Film
Author(s) -
Liu Yanpeng,
Guo Yufeng,
Sonam Surabhi,
Hong Seul Ki,
Nai Mui Hoon,
Nai Chang Tai,
Gao Libo,
Chen Jianyi,
Cho Byung Jin,
Lim Chwee Teck,
Guo Wanlin,
Loh Kian Ping
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201502010
Subject(s) - materials science , nanocrystalline material , hexagonal crystal system , composite material , nanoindentation , sapphire , buckling , elastic modulus , nanotechnology , crystallography , optics , chemistry , laser , physics
Sinusoidal wrinkles develop in compressively stressed film as a means to release stored elastic energy. Here, a simple way to fabricate large‐area, periodic, hexagonal wrinkled pattern on nanocrystalline graphitic films grown on c ‐plane sapphire (<50 nm thick) by the spontaneous delamination–buckling of the as‐grown film during cooling is reported. According to the continuum mechanics calculation, strain‐relief pattern adopting the hexagonal wrinkled pattern has a lower elastic energy than that of the telephone cord wrinkle at thickness regime below 50 nm. A high‐fidelity transfer method is developed to transfer the hexagonal wrinkled films onto arbitrary substrates. Nanoindentation studies show that hexagonal wrinkle film engineered this way may act as shock absorber. The hexagonal wrinkled carbon film is able to selectively promote the differentiation of human mesenchymal stem cell toward the osteogenic lineage in the absence of osteogenic inducing medium.