KU Leuven-University of Leuven, Department of Chemistry, Division of Molecular Imaging and Photonics, Celestijnenlaan 200F, B-3001 Leuven, Belgium.
Nanoscale. 2017 Jan 7;9(1):362-368. doi: 10.1039/c6nr07519c. Epub 2016 Dec 7.
Highly oriented pyrolytic graphite (HOPG) can be covalently grafted with aryl radicals generated via the electrochemical reduction of 3,5-bis-tert-butyl-diazonium cations (3,5-TBD). The structure of the grafted layer and its stability under electrochemical conditions were assessed with electrochemical scanning tunneling microscopy (EC-STM) and cyclic voltammetry (CV). Stable within a wide (>2.5 V) electrochemical window, the grafted species can be locally removed using EC-STM-tip nanolithography. Using dibenzyl viologen as an example, we show that the generated nanocorrals of bare graphitic surface can be used to study nucleation and growth of self-assembled structures under conditions of nanoconfinement and electrochemical potential control.
高度取向的热解石墨（HOPG）可以通过电化学还原 3,5-双-叔丁基重氮阳离子（3,5-TBD）生成的芳基自由基共价接枝。使用电化学扫描隧道显微镜（EC-STM）和循环伏安法（CV）评估接枝层的结构及其在电化学条件下的稳定性。在宽（>2.5 V）电化学窗口内稳定，使用 EC-STM 尖端纳米光刻术可以局部去除接枝物种。以二苄基联吡啶为例，我们表明可以使用生成的裸露石墨表面纳米笼来研究在纳米约束和电化学电势控制条件下自组装结构的成核和生长。
