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arXiv 2202.06609cond-mat.mtrl-sciphysics.app-ph
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通过高分辨率表面工程利用1,3-偶极环加成实现单层石墨烯的确定性共价有机功能化

Deterministic Covalent Organic Functionalization of Monolayer Graphene with 1,3-Dipolar Cycloaddition Via High Resolution Surface Engineering

Luca Basta, Federica Bianco, Aldo Moscardini, Filippo Fabbri, Luca Bellucci, Valentina Tozzini, Stefan Heun, Stefano Veronesi

AI总结:

该研究结合低能电子束缺陷工程与甲亚胺叶立德1,3-偶极环加成,实现约100 nm分辨率、可逆的单层石墨烯空间选择性共价功能化。

摘要:

通过将低能电子束辐照与 azomethine ylide(甲亚胺叶立德)的1,3-偶极环加成相结合,成功实现了单层石墨烯的空间分辨有机功能化。实际上,通过电子束辐照获得的石墨烯蜂窝晶格修饰会导致石墨烯化学反应活性的局部增强。因此,得益于约100 nm的高空间分辨率结构缺陷生成,人们以良好受控的方式在石墨烯表面设计了化学反应活性图案。原子力显微镜和拉曼光谱可用于研究结构缺陷的二维空间分布以及由1,3-偶极环加成产生的新特征,证实了通过缺陷工程实现的石墨烯功能化具有空间选择性。研究通过实验和计算功率谱的从头算分子动力学模拟,考察了功能化石墨烯的拉曼特征。此外,由于聚焦激光辐照可诱导甲亚胺叶立德脱附,有机功能化被证明是可逆的。利用1,3-偶极环加成对高质量石墨烯进行选择性且可逆的功能化,是迈向纳米尺度受控合成石墨烯基复杂结构和器件的重要一步。

英文摘要:

Spatially-resolved organic functionalization of monolayer graphene is successfully achieved by combining low-energy electron beam irradiation with 1,3-dipolar cycloaddition of azomethine ylide. Indeed, the modification of the graphene honeycomb lattice obtained via electron beam irradiation yields to a local increase of the graphene chemical reactivity. As a consequence, thanks to the high-spatially resolved generation of structural defects (~ 100 nm), chemical reactivity patterning has been designed over the graphene surface in a well-controlled way. Atomic force microscopy and Raman spectroscopy allow to investigate the two-dimensional spatial distribution of the structural defects and the new features that arise from the 1,3-dipolar cycloaddition, confirming the spatial selectivity of the graphene functionalization achieved via defect engineering. The Raman signature of the functionalized graphene is investigated both experimentally and via ab initio molecular dynamics simulations, computing the power spectrum. Furthermore, the organic functionalization is shown to be reversible thanks to the desorption of the azomethine ylide induced by focused laser irradiation. The selective and reversible functionalization of high quality graphene using 1,3-dipolar cycloaddition is a significant step towards the controlled synthesis of graphene-based complex structures and devices at the nanoscale.

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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