Large-Area, Periodic, Hexagonal Wrinkles on Nanocrystalline Graphitic Film (Adv. Funct. Mater)

Adv. Funct. Mater
Yanpeng Liu, Kenry, Yufeng Guo, Surabhi Sonam, Seul Ki Hong, Mui Hoon Nai,
Chang Tai Nai, Libo Gao, Jianyi Chen, Byung Jin Cho, Chwee Teck Lim,
Wanlin Guo, and Kian Ping Loh
DOI: 10.1002/adfm.201502010
Large-Area, Periodic, Hexagonal Wrinkles on Nanocrystalline Graphitic Film
Department of Chemistry and Graphene Research Center National University of Singapore
3 Science Drive 3 , Singapore 117543 , Singapore
State Key Laboratory of Mechanics and Control of Mechanical Structures and MOE
Key Laboratory for Intelligent Nano Materials and Devices, Institute of Nanoscience,
Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China.
E-mail: yfguo@nuaa.edu.cn; Fax:+ 86-25-84895827; Tel: + 86-25-84890513

Abstract
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.

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