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Atomic-Scale Structure and its Impact on Chemical Properties of Aluminum Oxide Layers Prepared by Atomic Layer Deposition on Silica

preprint
submitted on 20.01.2021, 21:21 and posted on 22.01.2021, 06:12 by Monu Kaushik, César Leroy, Zixuan Chen, David Gajan, Elena Willinger, Christoph Müller, Franck Fayon, Dominique Massiot, Alexey Fedorov, Christophe Copéret, Anne Lesage, Pierre Florian
We report the atomic-scale structure of alumina layers obtained by atomic layer deposition (ALD) of trimethylaluminium onto partially dehydroxylated silica. Such a detailed insight into the atomic structure of the species formed with increasing Al content was gained using a variety of one- and two-dimensional solid-state nuclear magnetic resonance (NMR) experiments involving 27Al, 1H and 29Si nuclei. 15N dynamic nuclear polarization surface-enhanced NMR spectroscopy (15N DNP SENS) and infrared spectroscopy using 15N-labelled pyridine as a probe molecule reveal that aluminium oxide layers on amorphous silica contain both strong Bronsted and strong Lewis acid sites, whereby the relative abundance and nature of these sites, and therefore the acidity of the surface, evolve with increasing thickness of the alumina film.

Funding

ETH Zürich

European Research Council

Equipex

History

Email Address of Submitting Author

pierre.florian@cnrs-orleans.fr

Institution

Univ. Orléans

Country

France

ORCID For Submitting Author

0000-0003-4306-0815

Declaration of Conflict of Interest

No conflict of interest

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ChemRxiv

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