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Well‐ordered structure of methylene blue monolayers on Au(111) surface: Electrochemical scanning tunneling microscopy studies
Author(s) -
Song Yonghai,
Wang Li
Publication year - 2009
Publication title -
microscopy research and technique
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.536
H-Index - 118
eISSN - 1097-0029
pISSN - 1059-910X
DOI - 10.1002/jemt.20646
Subject(s) - scanning tunneling microscope , monolayer , substrate (aquarium) , materials science , electrochemistry , crystallography , chemistry , nanotechnology , electrode , oceanography , geology
Well‐ordered structure of methylene blue (MB) monolayers on Au(111) surface has been successfully obtained by controlling the substrate potential. Electrochemical scanning tunneling microscopy (ECSTM) examined the monolayers of MB on Au(111) in 0.1 M HClO 4 and showed long‐range ordered, interweaved arrays of MB with quadratic symmetry on the substrate in the potential range of double‐layer charging. High‐resolution ECSTM image further revealed the details of the MB monolayers structure of c (5 × 5√3) rect and the flat‐lying orientation of ad‐molecules. The dependence of molecular organization on the substrate potential and the formation mechanism of well‐ordered structure on Au(111) surface were investigated in detail. The obtained well‐ordered structure at the interface between a metal and an aqueous electrolyte might possibly be used as high‐density device for signal memory and templates for the advanced nanopatterning of surfaces. Microsc. Res. Tech., 2009. © 2008 Wiley‐Liss, Inc.