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Issue 7, 2014
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Epitaxial transfer through end-group coordination modulates the odd–even effect in an alkanethiol monolayer assembly

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Abstract

Short spacer length and high end-group coordination lead to the top network acting as a template for the buried sulfur–gold interface of n-alkanethiols (SH–(CH2)n–OH or SH–(CH2)n–CH3) on gold {111}. Annealing and templating both drive toward a higher sampling of the spatially favorable bridge adsorption sites. The hydrogen-bonded network increases in strength by increasing the number of hydrogens participating per oxygen, from 1.75 to 1.98 for n = 14–30. Higher n leads to better packing (five times for hydroxyl-terminated and seven times for methyl-terminated for n = 14–30) and stability of monolayers, while lower n results in better epitaxial transfer (transfer coefficient ratio = 13.5 for {SH–(CH2)14–OH}/{SH–(CH2)30–CH3}) and actuation. Odd values of n for the hydroxyl-terminated n-alkanethiols lead to lattice spacing of an average of 0.04 ± 0.01 Å higher than even values. There is a structural transition in properties around spacer length n = 24–27. Characterization of monolayer assembly through correlation between adatom and network layers provides recursive design principles for actuation and sensing applications.

Graphical abstract: Epitaxial transfer through end-group coordination modulates the odd–even effect in an alkanethiol monolayer assembly

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Supplementary files

Article information


Submitted
23 Oct 2013
Accepted
18 Jan 2014
First published
21 Jan 2014

Nanoscale, 2014,6, 3496-3502
Article type
Communication
Author version available

Epitaxial transfer through end-group coordination modulates the odd–even effect in an alkanethiol monolayer assembly

Y. Y. Yimer, K. C. Jha and M. Tsige, Nanoscale, 2014, 6, 3496
DOI: 10.1039/C3NR05671F

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