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

Anshuma Pathak, Achyut Bora, Björn Braunschweig, Christian Meltzer, Hongdan Yan, Peter Lemmens, Winfried Daum, Jeffrey Schwartz, Marc Tornow

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7 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)6291-6295
Number of pages5
JournalNanoscale
Volume9
Issue number19
DOIs
StatePublished - May 21 2017

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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    Pathak, A., Bora, A., Braunschweig, B., Meltzer, C., Yan, H., Lemmens, P., Daum, W., Schwartz, J., & Tornow, M. (2017). Nanocylindrical confinement imparts highest structural order in molecular self-assembly of organophosphonates on aluminum oxide. Nanoscale, 9(19), 6291-6295. https://doi.org/10.1039/c7nr02420g