Tunable Wettability of Graphene through Nondestructive Hydrogenation and Wettability-Based Patterning for Bioapplications

Title
Tunable Wettability of Graphene through Nondestructive Hydrogenation and Wettability-Based Patterning for Bioapplications
Authors
손장엽Jong-Young LeeNalae HanJongin ChaJonghyun ChoiJunyoung KwonSungWoo NamKyung-Hwa YooGwan-Hyoung LeeJongill Hong
Keywords
Graphene; Hydrogenated graphene; Wettability; Hydrophobicity; Surface engineering
Issue Date
2020-08
Publisher
Nano letters
Citation
VOL 20, NO 8-5631
Abstract
The wettability of graphene has been extensively studied and successfully modified by chemical functionalization. Nevertheless, the unavoidable introduction of undesired defects and the absence of systematic and local control over wettability by previous methods have limited the use of graphene in applications. In addition, microscale patterning, according to wettability, has not been attempted. Here, we demonstrate that the wettability of graphene can be systematically controlled and surface patterned into microscale sections based on wettability without creating significant defects, possible by nondestructive hydrogen plasma. Hydrophobic graphene is progressively converted to hydrophilic hydrogenated graphene (H-Gr) that reaches superhydrophilicity. The great contrast in wettability between graphene and H-Gr makes it possible to selectively position and isolate human breast cancer cells on arrays of micropatterns since strong hydrophilicity facilitates the adsorption of the cells. We believe that our method will provide an essential technique for enabling surface and biological applications requiring microscale patterns with different wettability.
URI
http://pubs.kist.re.kr/handle/201004/72142
ISSN
1530-6984
Appears in Collections:
KIST Publication > Article
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