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Issue 19, 2017
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Nanocylindrical confinement imparts highest structural order in molecular self-assembly of organophosphonates on aluminum oxide

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Abstract

We report the impact of geometrical constraint on intramolecular interactions in self-assembled monolayers (SAMs) of alkylphosphonates grown on anodically oxidized aluminum (AAO). Molecular order in these films was determined by sum frequency generation (SFG) spectroscopy, a more sensitive measure of order than infrared absorption spectroscopy. Using SFG we show that films grown on AAO are, within detection limits, nearly perfectly ordered in an all-trans alkyl chain configuration. In marked contrast, films formed on planar, plasma-oxidized aluminum oxide or α-Al2O3 (0001) are replete with gauche defects. We attribute these differences to the nanocylindrical structure of AAO, which enforces molecular confinement.

Graphical abstract: Nanocylindrical confinement imparts highest structural order in molecular self-assembly of organophosphonates on aluminum oxide

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Article information


Submitted
05 Apr 2017
Accepted
27 Apr 2017
First published
09 May 2017

Nanoscale, 2017,9, 6291-6295
Article type
Communication

Nanocylindrical confinement imparts highest structural order in molecular self-assembly of organophosphonates on aluminum oxide

A. Pathak, A. Bora, B. Braunschweig, C. Meltzer, H. Yan, P. Lemmens, W. Daum, J. Schwartz and M. Tornow, Nanoscale, 2017, 9, 6291
DOI: 10.1039/C7NR02420G

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