STM visualisation of counterions and the effect of charges on self-assembled monolayers of macrocycles

被引：14

作者：

Kudernac, Tibor ^{[2
,3
]}

Shabelina, Natalia ^{[1
]}

Mamdouh, Wael ^{[2
,4
]}

Hoeger, Sigurd ^{[1
]}

De Feyter, Steven ^{[2
]}

机构：

[1] Univ Bonn, Kekule Inst Organ Chem & Biochem, D-53121 Bonn, Germany

[2] Katholieke Univ Leuven, Dept Chem, Div Mol Imaging & Photon, Lab Photochem & Spect, B-3001 Louvain, Belgium

[3] Univ Twente, Mol Nanofabricat Grp, MESA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands

[4] Amer Univ Cairo, Dept Chem, Sch Sci & Engn, New Cairo 11835, Egypt

来源：

BEILSTEIN JOURNAL OF NANOTECHNOLOGY | 2011年 / 2卷

关键词：

counterions; liquid-solid interface; macrocycles; scanning tunnelling microscopy; self-assembly; SCANNING-TUNNELING-MICROSCOPY; SHAPE-PERSISTENT MACROCYCLES; SUPRAMOLECULAR RECTANGLE; MOLECULAR NETWORKS; SURFACE; GRAPHITE; HOPG; ADSORPTION; TEMPLATE; LAYERS;

D O I：

10.3762/bjnano.2.72

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Despite their importance in self-assembly processes, the influence of charged counterions on the geometry of self-assembled organic monolayers and their direct localisation within the monolayers has been given little attention. Recently, various examples of self-assembled monolayers composed of charged molecules on surfaces have been reported, but no effort has been made to prove the presence of counterions within the monolayer. Here we show that visualisation and exact localisation of counterions within self-assembled monolayers can be achieved with scanning tunnelling microscopy (STM). The presence of charges on the studied shape-persistent macrocycles is shown to have a profound effect on the self-assembly process at the liquid- solid interface. Furthermore, preferential adsorption was observed for the uncharged analogue of the macrocycle on a surface.

引用

页码：674 / 680

页数：7

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