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Ultrastiff, Strong, and Highly Thermally Conductive Crystalline Graphitic Films with Mixed Stacking Order
Author(s) -
Wang Bin,
Cunning Benjamin V.,
Kim Na Yeon,
Kargar Fariborz,
Park SunYoung,
Li Zhancheng,
Joshi Shalik R.,
Peng Li,
Modepalli Vijayakumar,
Chen Xianjue,
Shen Yongtao,
Seong Won Kyung,
Kwon Youngwoo,
Jang Jeongsu,
Shi Haofei,
Gao Chao,
Kim GunHo,
Shin Tae Joo,
Kim Kwanpyo,
Kim JuYoung,
Balandin Alexander A.,
Lee Zonghoon,
Ruoff Rodney S.
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201903039
Subject(s) - materials science , stacking , electrical conductor , order (exchange) , nanotechnology , chemical engineering , composite material , organic chemistry , chemistry , finance , engineering , economics
A macroscopic film (2.5 cm × 2.5 cm) made by layer‐by‐layer assembly of 100 single‐layer polycrystalline graphene films is reported. The graphene layers are transferred and stacked one by one using a wet process that leads to layer defects and interstitial contamination. Heat‐treatment of the sample up to 2800 °C results in the removal of interstitial contaminants and the healing of graphene layer defects. The resulting stacked graphene sample is a freestanding film with near‐perfect in‐plane crystallinity but a mixed stacking order through the thickness, which separates it from all existing carbon materials. Macroscale tensile tests yields maximum values of 62 GPa for the Young's modulus and 0.70 GPa for the fracture strength, significantly higher than has been reported for any other macroscale carbon films; microscale tensile tests yield maximum values of 290 GPa for the Young's modulus and 5.8 GPa for the fracture strength. The measured in‐plane thermal conductivity is exceptionally high, 2292 ± 159 W m −1 K −1 while in‐plane electrical conductivity is 2.2 × 10 5 S m −1 . The high performance of these films is attributed to the combination of the high in‐plane crystalline order and unique stacking configuration through the thickness.