TITLE

Preparation of tips coated with poly(dimethylsiloxane) for scanning tunneling microscopy in aqueous solutions

AUTHOR(S)
Kuroda, Mizuki; Nishino, Tomoaki
PUB. DATE
June 2011
SOURCE
Review of Scientific Instruments;Jun2011, Vol. 82 Issue 6, p063707
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A simple and reliable method for preparing tips coated with poly(dimethylsiloxane) (PDMS) for scanning tunneling microscopy (STM) in aqueous solutions is reported. Au STM tips were dip-coated with PDMS and subsequently cured. The coated tips were characterized by scanning electron microscopy, energy dispersive x-ray spectroscopy, and voltammetry. We show that the PDMS layer smoothly covers the tip surface except for its very apex. These tips enable atomically resolved imaging of a sample surface and measurement of single-molecule conductance below 1.0 nS with STM in aqueous solutions. Because of the superior compatibility of PDMS with organic solvents, the PDMS-coated tips would be useful for preparing molecular tips via their chemical modification in such solvents, enabling chemically selective imaging of a single molecule in water.
ACCESSION #
62010814

 

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