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Volume 204, 2017
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Generic nature of long-range repulsion mechanism on a bulk insulator?

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Abstract

Dynamic atomic force microscopy measurements are reported that provide evidence for the presence of long-range repulsion in molecular self-assembly on a bulk insulator surface. We present the structures formed from four different benzoic acid derivatives on the (10.4) cleavage plane of calcite kept in ultra-high vacuum. These molecules have in common that they self-assemble into molecular stripes when deposited onto the surface held at room temperature. For all molecules tested, a detailed analysis of the stripe-to-stripe distance distribution reveals a clear deviation from what would be expected for randomly placed, non-interacting stripes (i.e., geometric distribution). When excluding kinetic effects during growth, this result gives evidence for a long-range repulsion mechanism acting during the assembly of these stripes. The fact that this finding is robust against changes in the molecular structure indicates a generic nature of the observed mechanism, implying a ubiquitous origin such as electrostatic repulsion. Finally, we discuss parameters that might affect the unambiguous observation of this generic repulsion under specific experimental conditions.

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Submitted
03 Mar 2017
Accepted
24 Mar 2017
First published
24 Mar 2017

Faraday Discuss., 2017,204, 419-428
Article type
Paper

Generic nature of long-range repulsion mechanism on a bulk insulator?

J. L. Neff, A. Richter, H. Söngen, C. Venturini, A. Gourdon, R. Bechstein and A. Kühnle, Faraday Discuss., 2017, 204, 419
DOI: 10.1039/C7FD00089H

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