Graphene is considered an enabling material for next generation sensors, due to the remarkable properties derived from its atomic thickness. However, these promises come with acute sensitivity to parasite adsorbates, that may hinder reaching the full potential of commercial devices. Herein we report a detailed study of the dramatic effect of adsorbed carbon chains on the effective mechanical properties of graphene monolayers supported by different liquids. We first extract the equivalent bending stiffness of graphene/alcohol bilayers by observing the spontaneous wrinkling of graphene sheets floating on solutions of increasing alcohol contents. We find gains in flexibilities of more than three orders of magnitude compared to expected and previously reported values. We then implement the role of frustrated adsorption in classical membrane models and predict quantitatively the wrinkling transition with no fitting parameters. We also predict a simultaneous transition in alcohol adsorbed on the wrinkled graphene monolayer. We finally characterize this dual transition by detailed combined optical analysis and confocal Raman spectroscopy, and confirm the predictions of the presented model as well as the claims of superflexibility.

中文翻译：

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吸附诱导的单层石墨烯自发曲率和超挠性

石墨烯由于其原子厚度而具有非凡的性能，因此被认为是下一代传感器的使能材料。但是，这些承诺对寄生虫吸附物具有敏锐的敏感性，这可能会阻碍其充分发挥商用设备的潜力。本文中，我们报告了对吸附的碳链对由不同液体支撑的石墨烯单层的有效机械性能的显着影响的详细研究。我们首先通过观察漂浮在酒精含量增加的溶液上的石墨烯片的自发起皱来提取石墨烯/酒精双层的等效弯曲刚度。与预期和先前报告的值相比，我们发现灵活性提高了三个数量级以上。然后，我们在经典膜模型中实现沮丧吸附的作用，并在没有拟合参数的情况下定量预测起皱转变。我们还预测了皱纹石墨烯单层上吸附的酒精会同时发生转变。我们最终通过详细的组合光学分析和共焦拉曼光谱表征了这种双重转变，并确认了所提出模型的预测以及超柔韧性的主张。