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Ruoff, Rodney S.
Center for Multidimensional Carbon Materials (CMCM)
Research Interests
  • Next generation carbons, ultrathin sp3-bonded carbon sheets, negative curvature (‘Schwartzites’) carbons, sp3/sp2 hybrid carbon materials, model compounds for novel carbon materials, reaction mechanisms

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Ultrastiff, Strong, and Highly Thermally Conductive Crystalline Graphitic Films with Mixed Stacking Order

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Title
Ultrastiff, Strong, and Highly Thermally Conductive Crystalline Graphitic Films with Mixed Stacking Order
Author
Wang, BinCunning, Benjamin V.Kim, Na YeonKargar, FariborzPark, Sun‐YoungLi, ZhanchengJoshi, Shalik R.Peng, LiModepalli, VijayakumarChen, XianjueShen, YongtaoSeong, Won KyungKwon, YoungwooJang, JeongsuShi, HaofeiGao, ChaoKim, Gun‐HoShin, Tae JooKim, KwanpyoKim, Ju-YoungBalandin, Alexander A.Lee, ZonghoonRuoff, Rodney S.
Issue Date
2019-07
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, v.31, no.29, pp.1903039
Abstract
A macroscopic film (2.5 cm x 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 degrees 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 x 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.
URI
https://scholarworks.unist.ac.kr/handle/201301/27023
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/adma.201903039
DOI
10.1002/adma.201903039
ISSN
0935-9648
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