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Issue 48, 2018
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Bimodal atomic force microscopy for the characterization of thiolated self-assembled monolayers

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Abstract

Surface coatings are becoming an integral part of materials. In recent years, molecular coatings have found larger acceptance and uses. Among them, self-assembled monolayers (SAMs) are attractive due to their inherent versatility, manufacturability, and scale up ease. Understanding their structure-properties relationships in realistic conditions remains a major challenge. Here we present a methodology based on simultaneous topographical and nanomechanical characterization of SAMs using a commercially available setup for bimodal atomic force microscopy (AFM). It allows for accurate and quantitative measurement of surface elasticity, which is correlated to molecular ordering through topographical imaging. Our results indicate that effective surface elasticity (E*) scales with monolayer formation-time and ligand-length, parameters known to affect ligand ordering. The method developed, is extended to provide localization of the chemical species present in thiolated binary SAMs. Within the systems tested phase separation down to ∼10 nm domains could be observed both in the topography and in the elasticity channel.

Graphical abstract: Bimodal atomic force microscopy for the characterization of thiolated self-assembled monolayers

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Supplementary files

Article information


Submitted
20 Sep 2018
Accepted
15 Nov 2018
First published
03 Dec 2018

Nanoscale, 2018,10, 23027-23036
Article type
Paper

Bimodal atomic force microscopy for the characterization of thiolated self-assembled monolayers

E. Athanasopoulou, N. Nianias, Q. K. Ong and F. Stellacci, Nanoscale, 2018, 10, 23027
DOI: 10.1039/C8NR07657J

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