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Ultrastiff, Strong, and Highly Thermally Conductive Crystalline Graphitic Films with Mixed Stacking Order
Wang, Bin1; Cunning, Benjamin, V1; Kim, Na Yeon1,2; Kargar, Fariborz3; Park, Sun-Young1,2; Li, Zhancheng4; Joshi, Shalik R.5; Peng, Li6; Modepalli, Vijayakumar1; Chen, Xianjue1
2019-07-01
摘要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.
关键词graphene layer-by-layer mechanical thermal
DOI10.1002/adma.201903039
发表期刊ADVANCED MATERIALS
ISSN0935-9648
卷号31期号:29页码:10
通讯作者Cunning, Benjamin, V(ben.cunning@gmail.com) ; Ruoff, Rodney S.(rsruoff@ibs.re.kr)
收录类别SCI
WOS记录号WOS:000477975900007
语种英语