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arXiv 2107.09436cond-mat.mtrl-scicond-mat.other
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石墨烯的大规模纳米级化学功能化

Large scale chemical functionalization of graphene with nanometer resolution

Karolina Drogowska, Václav Valeš, Jan Plšek, Magdalena Michlová, Jana Vejpravová, Martin Kalbáč

摘要:

将各种官能团引入石墨烯是定制其功能特性的最通用方法。迄今为止,人们必须使用特殊的隧道显微镜将分子附着在石墨烯上的特定位置,分辨率优于几百纳米,然而,在大规模上实现这种分辨率是不可能的。我们首次证明,通过将具有纳米尺度调制的应变引入石墨烯层中,可以以纳米分辨率实现化学功能化。应变的空间分布已经通过将单层石墨烯(SLG)转移到由几nm大的纳米颗粒(NP)装饰的衬底上来实现。通过改变基板上的纳米粒子的数量,局部应变SLG的量增加,证实了原子力显微镜(AFM)和拉曼光谱研究。我们进一步对具有增加的纳米级波纹量的SLG进行氢化和氢化。拉曼光谱、原子力显微镜和X射线光电子能谱学明确地揭示了官能化水平随着纳米颗粒的数量成比例地增加,这意味着局部应变的SLG的数量增加。因此,我们的方法能够以纳米分辨率控制石墨烯上官能团的数量和位置。

英文摘要:

Anchoring various functional groups to graphene is the most versatile approach for tailoring its functional properties. To date, one must use a special tunneling microscope for attaching a molecule at a specific position on the graphene with resolution better than several hundred nanometers, however, achieving this resolution is impossible on a large scale. We demonstrate for the first time that chemical functionalization can be achieved with nanometer resolution by introducing strain with nanometer scale modulation into a graphene layer. The spatial distribution of the strain has been achieved by transferring a single-layer graphene (SLG) onto a substrate decorated by a few nm large nanoparticles (NPs). By changing the number of NPs on the substrate, the amount of locally strained SLG increases, as confirmed by atomic force microscopy (AFM) and Raman spectroscopy investigations. We further carried out hydrogenation and fluorination on the SLG with increasing amount of nanoscale corrugations. Raman spectroscopy, AFM and X-ray photoelectron spectroscopy revealed unambiguously that the level of functionalization increases proportionally with the number of NPs, which means an increasing number of the locally strained SLG. Our approach thus enables control of the amount and the position of functional groups on graphene with nanometer resolution.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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