Self-Assembled Monolayers as Templates for Linearly Nanopatterned Covalent Chemical Functionalization of Graphite and Graphene Surfaces
Self-Assembled Monolayers as Templates for Linearly Nanopatterned Covalent Chemical Functionalization of Graphite and Graphene Surfaces
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DOI：
10.1021/acsnano.8b06681
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发表时间：
2018-11-01
期刊：
影响因子：
17.1
通讯作者：
Tobe, Yoshito
中科院分区：
文献类型：
--
作者：
Tahara, Kazukuni;Ishikawa, Toni;Tobe, Yoshito
提出了一种以正构烷烃分子自组装膜为模板，在石墨表面进行纳米级共价功能化的方法。利用不同长度的分子模板证明了具有5或7 nm横向周期性的线性排列的芳基。该方法的关键特征是使用相分离的溶液双层，该溶液双层由含有模板分子的薄有机层和含有能够电化学还原以产生芳基自由基从而引起表面接枝的芳基重氮分子的水层组成。在扫描电位时，正烷烃末端边缘处的横向位移动力学与电化学扩散一起作用，以导致以线性方式形成模板化共价键。该方案被证明适用于石墨烯的线性接枝。本文所述的本发明的工艺可用于实现合理设计的纳米级材料。
An approach for nanoscale covalent functionalization of graphite surfaces employing self-assembled molecular monolayers of n-alkanes as templating masks is presented. Linearly aligned aryl groups with a lateral periodicity of 5 or 7 nm are demonstrated utilizing molecular templates of different lengths. The key feature of this approach is the use of a phase separated solution double layer consisting of a thin organic layer containing template molecules topped by an aqueous layer containing aryldiazonium molecules capable of electrochemical reduction to generate aryl radicals which bring about surface grafting. Upon sweeping of the potential, lateral displacement dynamics at the n-alkane terminal edges acts in conjunction with electrochemical diffusion to result in templated covalent bond formation in a linear fashion. This protocol was demonstrated to be applicable to linear grafting of graphene. The present processing described herein is useful for the realization of rationally designed nanoscale materials.