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在基板上自动撕裂和剥离石墨烯带的自组装
James Annett1,2,3, Graham L W Cross1,2,3
1Centre for Research on Adaptive Nanostructures and Nanodevices, Trinity College, Dublin 2, Ireland.
Nature
|July 15, 2016
概括
热能驱动石墨烯丝带的自组装,使其能够控制地从基板上撕裂和剥离. 这一发现利用弱表面力来塑造二维材料,影响了设备的制造.
科学领域:
- 材料科学
- 纳米技术
- 机械工程
背景情况:
- 石墨烯和二维材料具有独特的机械性能,类似于折叠和切割纸张.
- 二维材料的分子尺度允许由于热激活而产生显著的外平移动.
- 之前的研究集中在热活动引起纹和影响曲硬性.
研究的目的:
- 研究热激活对二维材料行为的明显影响.
- 展示二维材料的自动滑动,撕裂和剥离.
- 探索设计和操作二维材料的新方法.
主要方法:
- 使用纳米印记式接触技术进行石墨烯带自组合的核和方向.
- 在环境条件下观察材料的行为.
- 应用骨折力学模型来解释实验结果.
主要成果:
- 热激活导致2D材料在宏观尺度上自发地滑动,撕裂和剥离.
- 可扩展的纳米印记技术成功地引导了石墨烯丝带的并行自组装.
- 一个断裂力学模型证实了热力学力量驱动了基板接触的石墨烯-石墨烯接口形成.
结论:
- 较弱的物理表面力,当被折叠的石墨烯配置聚焦时,可以克服强的共价键.
- 这种现象为基于二维材料的装置提供了一条有前途的路线.
- 这些发现揭示了通过热激活来操纵石墨烯机械行为的新机制.
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