Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 67: Poster Wednesday: Solid-Liquid Interfaces

O 67.9: Poster

Mittwoch, 3. April 2019, 17:45–20:00, Poster B2

Polarimetric angle-resolved second harmonic scattering on semiconductor nanoparticles in aqueous environments — •Marie Bischoff, Arianna Marchioro, and Sylvie Roke — Laboratory for fundamental BioPhotonics (LBP), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne

Metal oxides are semiconductor materials with a high physical and chemical stability. Therefore they are extensively studied for the use in environmental and energy applications, such as for example photocatalytic water splitting. Despite their highly promising characteristics, the underlying performance of those materials is still limited. In order to enhance surface-mediated processes and photochemical reactions, it is crucial to understand the microscopic structure of the semiconductor/electrolyte interface.

Second order nonlinear optical techniques are powerful tools to study processes at surfaces and interfaces as they are sensitive to surface molecular orientation and interfacial electric fields. In this work we investigate semiconductor nanoparticles in aqueous environments with nonlinear optical techniques, more specifically polarimetric angle-resolved second harmonic scattering (AR-SHS). We apply AR-SHS in order to extract information on the semiconductor/electrolyte interface and determine parameters such as surface potential and surface molecular orientation, which are difficult to obtain by other techniques.