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A photochemical approach for a fast and self-limited covalent modification of surface supported graphene with photoactive dyes

机译：具有光活性染料的快速和自动限定的表面支持的石墨烯的快速和自动限制的光化学方法

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摘要

Herein, we report a simple method for a covalent modification of surface supported graphene with photoactive dyes. Graphene was fabricated on cubic-SiC/Si(001) wafers due to their low cost and suitability for mass-production of continuous graphene fit for electronic applications on millimetre scale. Functionalisation of the graphene surface was carried out in solution via white light induced photochemical generation of phenazine radicals from phenazine diazonium salt. The resulting covalently bonded phenazine-graphene hybrid structure was characterised by scanning tunnelling microscopy (STM) and spectroscopy (STS), raman spectroscopy and density functional theory (DFT) calculations. It was found that phenazine molecules form an overlayer, which exhibit a short range order with a rectangular unit cell on the graphene surface. DFT calculations based on STM results reveal that molecules are standing up in the overlayer with the maximum coverage of 0.25 molecules per graphene unit cell. Rraman spectroscopy and STM results show that the growth is limited to one monolayer of standing molecules. STS reveals that the phenazine-graphene hybrid structure has a band gap of 0.8 eV.
机译：在此，我们报告了一种简单的方法，用于使用光活性染料的表面负载石墨烯的共价修饰。由于它们的低成本和适用性，在立方-SiC / Si（001）晶片上制造了石墨烯，用于大规模生产的连续石墨烯适用于毫米级的电子应用。石墨烯表面的官能化在溶液中通过白光诱导从吩嗪重氮盐的苯嗪基团的光化学产生。由此产生的共价键合的苯齐氮烯杂化结构通过扫描隧穿显微镜（STM）和光谱（STS），拉曼光谱和密度泛函理论（DFT）计算来表征。发现吩嗪分子形成叠层，其在石墨烯表面上具有矩形单元电池的短距离顺序。基于STM结果的DFT计算表明，分子在覆盖器中竖立在覆盖层中，每个石墨烯单元电池的最大覆盖率为0.25分子。 Rraman光谱和STM结果表明，生长仅限于一单层常设分子。 STS揭示了吩嗪 - 石墨烯混合结构的带隙为0.8eV。

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