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Modification and patterning of self-assembled monolayers using electrogenerated etchants and homogeneous scavenging reactions in a scanning electrochemical microscope
Publikationstyp
Journal Article
Date Issued
2021-08-13
Sprache
English
Author(s)
Vaske, Britta
Meiners, Frank
Ross, Jan Henning
Christoffers, Jens
Journal
Volume
8
Issue
16
Start Page
3192
End Page
3202
Citation
ChemElectroChem 8 (16): 3192-3202 (2021)
Publisher DOI
Scopus ID
Publisher
Wiley-VCHGmbH
Self-assembled monolayers (SAMs) of oligoethylene glycol (OEG)-terminated alkanethiolates on gold, which are used to control protein adsorption and cell adhesion, were patterned by reaction with Br2/HOBr electrogenerated at a microelectrode of a scanning electrochemical microscope (SECM). The spreading of the Br2 diffusion layers was limited by a homogeneous reaction with cystamine or L-cystine as scavengers. The influence of process parameters on the patterning process was explored by simulation and combinatorial experiments. The experimental determination of pattern sizes from SECM feedback images was verified by scanning force microscopy. The simulation considered the local Br2 formation as well as Br2 consumption in the reaction with the OEG SAM, by reduction at the gold substrate, and by the homogeneous scavenging reaction. It used experimentally determined diffusion coefficients and rate constants of the scavenging reaction. and Experiments and simulation confirmed the existence of regions in the parameter space, in which the patterning process is robust against small variation of the parameters working distance, pulse time and scavenger excess.
Subjects
oligoethylene glycol
patterning
scanning electrochemical microscopy
scavenger
self-assembled monolayer
DDC Class
621: Applied Physics
540: Chemistry