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Lin, Li; Zhang, Jincan; Su, Haisheng; Li, Jiayu; Sun, Luzhao; Wang, Zihao; Xu, Fan; Liu, Chang; Lopatin, Sergei; Zhu, Yihan; Jia, Kaicheng; Chen, Shulin; Rui, Dingran; Sun, Jingyu; Xue, Ruiwen; Gao, Peng; Kang, Ning; Han, Yu; Xu, H Q; Cao, Yang; Novoselov, K S; Tian, Zhongqun; Ren, Bin; Peng, Hailin; Liu, Zhongfan
Nature communications, 04/2019, Volume: 10, Issue: 1Journal Article
Impurities produced during the synthesis process of a material pose detrimental impacts upon the intrinsic properties and device performances of the as-obtained product. This effect is especially pronounced in graphene, where surface contamination has long been a critical, unresolved issue, given graphene's two-dimensionality. Here we report the origins of surface contamination of graphene, which is primarily rooted in chemical vapour deposition production at elevated temperatures, rather than during transfer and storage. In turn, we demonstrate a design of Cu substrate architecture towards the scalable production of super-clean graphene (>99% clean regions). The readily available, super-clean graphene sheets contribute to an enhancement in the optical transparency and thermal conductivity, an exceptionally lower-level of electrical contact resistance and intrinsically hydrophilic nature. This work not only opens up frontiers for graphene growth but also provides exciting opportunities for the utilization of as-obtained super-clean graphene films for advanced applications.
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