Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871, P. R. China.
Adv Mater. 2019 Oct;31(43):e1902978. doi: 10.1002/adma.201902978. Epub 2019 Sep 10.
Contamination is a major concern in surface and interface technologies. Given that graphene is a 2D monolayer material with an extremely large surface area, surface contamination may seriously degrade its intrinsic properties and strongly hinder its applicability in surface and interfacial regions. However, large-scale and facile treatment methods for producing clean graphene films that preserve its excellent properties have not yet been achieved. Herein, an efficient postgrowth treatment method for selectively removing surface contamination to achieve a large-area superclean graphene surface is reported. The as-obtained superclean graphene, with surface cleanness exceeding 99%, can be transferred to dielectric substrates with significantly reduced polymer residues, yielding ultrahigh carrier mobility of 500 000 cm V s and low contact resistance of 118 Ω µm. The successful removal of contamination is enabled by the strong adhesive force of the activated-carbon-based lint roller on graphene contaminants.
污染是表面和界面技术的主要关注点。鉴于石墨烯是一种具有极大表面积的二维单层材料，表面污染可能会严重降低其固有性质，并强烈阻碍其在表面和界面区域的应用。然而，还没有实现大规模且易于处理的方法来制备保持其优异性能的清洁石墨烯薄膜。在此，报道了一种有效的后生长处理方法，用于选择性地去除表面污染物，从而获得大面积的超清洁石墨烯表面。所获得的超清洁石墨烯，其表面清洁度超过 99%，可以转移到介电基底上，同时显著减少聚合物残留物，从而获得超高载流子迁移率 500000cm V s 和低接触电阻 118 Ω µm。污染的成功去除是由于基于活性炭的粘尘滚轮对石墨烯污染物的强粘附力。
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