We report on a new versatile experimental setup for in situ Rutherford backscattering spectrometry at solid-liquid interfaces which enables investigations of electric double layers directly and in a quantitative manner. A liquid cell with a three-electrode arrangement is mounted in front of the beam line, and a thin window (thickness down to 150 nm) separates the vacuum of the detector chamber from the electrolyte in the cell. By minimizing the contribution of the window to the measurement, a large variety of elements at the solid-liquid interface with sensitivities far below one monolayer can be monitored. The attachment of Ba onto the surface as a function of contact time and pH value of the electrolyte solution was chosen as an example system. From our measurement, we can not only follow the evolution of the double layer but also derive limits for the point of zero charge for the surface. Our findings of are in good agreement with values found in the literature obtained by other techniques. Despite focusing on a specific system in this work, the presented setup allows for a large variety of in situ investigations at solid-liquid interfaces such as, but not limited to, tracing electrochemical reactions and monitoring segregation, adsorption, and dissolution and corrosion processes.
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August 2019
Research Article|
August 21 2019
Revealing the formation dynamics of the electric double layer by means of in-situ Rutherford backscattering spectrometry
Nasrin B. Khojasteh;
Nasrin B. Khojasteh
1
Helmholtz-Zentrum Dresden-Rossendorf e.V.
, Bautzner Landstr. 400, 01328 Dresden, Germany
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Sabine Apelt
;
Sabine Apelt
2
Technische Universität Dresden, Institute of Material Science
, Helmholtzstr. 7, 01069 Dresden, Germany
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Ute Bergmann;
Ute Bergmann
2
Technische Universität Dresden, Institute of Material Science
, Helmholtzstr. 7, 01069 Dresden, Germany
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Stefan Facsko
;
Stefan Facsko
1
Helmholtz-Zentrum Dresden-Rossendorf e.V.
, Bautzner Landstr. 400, 01328 Dresden, Germany
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René Heller
René Heller
a)
1
Helmholtz-Zentrum Dresden-Rossendorf e.V.
, Bautzner Landstr. 400, 01328 Dresden, Germany
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
Rev. Sci. Instrum. 90, 085107 (2019)
Article history
Received:
April 16 2019
Accepted:
August 01 2019
Citation
Nasrin B. Khojasteh, Sabine Apelt, Ute Bergmann, Stefan Facsko, René Heller; Revealing the formation dynamics of the electric double layer by means of in-situ Rutherford backscattering spectrometry. Rev. Sci. Instrum. 1 August 2019; 90 (8): 085107. https://doi.org/10.1063/1.5100216
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