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Doping-Induced Tunable Wettability and Adhesion of Graphene

机译：掺杂引起的石墨烯可调润湿性和粘附性

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摘要

We report that substrate doping-induced charge carrier density modulation leads to the tunable wettability and adhesion of graphene. Graphene's water contact angle changes by as much as 13 degrees as a result of a 300 meV change in doping level. Upon either n- or p-type doping with subsurface polyelectrolytes, graphene exhibits increased hydrophilicity. Adhesion force measurements using a hydrophobic self-assembled monolayer-coated atomic force microscopy probe reveal enhanced attraction toward undoped graphene, consistent with wettability modulation. This doping-induced wettability modulation is also achieved via a lateral metal graphene heterojunction or subsurface metal doping. Combined first principles and atomistic calculations show that doping modulates the binding energy between water and graphene and thus increases its hydrophilicity. Our study suggests for the first time that the doping-induced modulation of the charge carrier density in graphene influences its wettability and adhesion. This opens up unique and new opportunities for the tunable wettability and adhesion of graphene for advanced coating materials and transducers.
机译：我们报告说，衬底掺杂诱导的电荷载流子密度调节导致石墨烯的可调润湿性和粘附性。由于掺杂水平变化了300 meV，石墨烯的水接触角变化了13度。在用地下聚电解质进行n型或p型掺杂时，石墨烯表现出增加的亲水性。使用疏水性自组装单层涂层原子力显微镜探针进行的粘合力测量表明，对未掺杂石墨烯的吸引力增强了，与润湿性调制相符。这种掺杂诱导的可湿性调节也可通过横向金属石墨烯异质结或地下金属掺杂来实现。结合的第一原理和原子计算表明，掺杂调节水和石墨烯之间的结合能，从而增加其亲水性。我们的研究首次提出，石墨烯中电荷载流子密度的掺杂诱导调制会影响其润湿性和粘附性。这为先进涂层材料和换能器的石墨烯的可调润湿性和附着力开辟了独特的新机遇。

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