Nanoscopic diffusion of water on a topological insulator

Anton Tamtögl, Marco Sacchi, Nadav Avidor, Irene Calvo-Almazán, Peter S. M. Townsend, Martin Bremholm, Philip Hofmann, John Ellis, William Allison

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

The microscopic motion of water is a central question, but gaining experimental information about the interfacial dynamics of water in fields such as catalysis, biophysics and nanotribology is challenging due to its ultrafast motion, and the complex interplay of inter-molecular and molecule-surface interactions. Here we present an experimental and computational study of the nanoscale-nanosecond motion of water at the surface of a topological insulator (TI), Bi2Te3. Understanding the chemistry and motion of molecules on TI surfaces, while considered a key to design and manufacturing for future applications, has hitherto been hardly addressed experimentally. By combining helium spin-echo spectroscopy and density functional theory calculations, we are able to obtain a general insight into the diffusion of water on Bi2Te3. Instead of Brownian motion, we find an activated jump diffusion mechanism. Signatures of correlated motion suggest unusual repulsive interactions between the water molecules. From the lineshape broadening we determine the diffusion coefficient, the diffusion energy and the pre-exponential factor.
Originalspracheenglisch
Aufsatznummer278
FachzeitschriftNature Communications
Jahrgang11
Ausgabenummer1
DOIs
PublikationsstatusVeröffentlicht - 14 Jan 2020

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insulators
Water
water
Molecules
Nanotribology
Biophysics
Helium
Brownian movement
biophysics
molecules
Catalysis
Density functional theory
surface reactions
catalysis
Spectroscopy
Spectrum Analysis
echoes
diffusion coefficient
manufacturing
helium

Schlagwörter

    Fields of Expertise

    • Advanced Materials Science

    Dies zitieren

    Tamtögl, A., Sacchi, M., Avidor, N., Calvo-Almazán, I., Townsend, P. S. M., Bremholm, M., ... Allison, W. (2020). Nanoscopic diffusion of water on a topological insulator. Nature Communications, 11(1), [278]. https://doi.org/10.1038/s41467-019-14064-7

    Nanoscopic diffusion of water on a topological insulator. / Tamtögl, Anton; Sacchi, Marco; Avidor, Nadav; Calvo-Almazán, Irene; Townsend, Peter S. M.; Bremholm, Martin; Hofmann, Philip; Ellis, John; Allison, William.

    in: Nature Communications, Jahrgang 11, Nr. 1, 278, 14.01.2020.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

    Tamtögl, A, Sacchi, M, Avidor, N, Calvo-Almazán, I, Townsend, PSM, Bremholm, M, Hofmann, P, Ellis, J & Allison, W 2020, 'Nanoscopic diffusion of water on a topological insulator' Nature Communications, Jg. 11, Nr. 1, 278. https://doi.org/10.1038/s41467-019-14064-7
    Tamtögl A, Sacchi M, Avidor N, Calvo-Almazán I, Townsend PSM, Bremholm M et al. Nanoscopic diffusion of water on a topological insulator. Nature Communications. 2020 Jan 14;11(1). 278. https://doi.org/10.1038/s41467-019-14064-7
    Tamtögl, Anton ; Sacchi, Marco ; Avidor, Nadav ; Calvo-Almazán, Irene ; Townsend, Peter S. M. ; Bremholm, Martin ; Hofmann, Philip ; Ellis, John ; Allison, William. / Nanoscopic diffusion of water on a topological insulator. in: Nature Communications. 2020 ; Jahrgang 11, Nr. 1.
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    KW - Density functional theory

    KW - Spin echo experiments

    KW - Friction

    KW - Atom scattering

    KW - Atom surface interaction

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