Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 49: Poster: Nanostructures on Surfaces I

O 49.19: Poster

Dienstag, 13. März 2018, 18:15–20:30, Poster A

Topographic and Phase Measurements of Embedded Gold Nanoparticles using Atomic Force Microscopy — •Annika Bergmann, Sven Kraft, Regina Lange, Sylvia Speller, and Ingo Barke — University of Rostock, Institute of Physics, 18059 Rostock, Germany

For functional mapping of nanoscale samples a clear distinction between topographic effects and the signal of interest is inevitable. In atomic force microscopy (AFM) phase images do not only reveal material contrast but they may also contain topographic information [1], which is sometimes referred to as topographic crosstalk. Here we study the phase contrast between gold-nanoparticles and a PMMA environment using AFM. In order to obtain largely "pure" phase images we aim at creating a planar surface by embedding the nanoparticles into the polymer matrix. To achieve this, two different approaches are taken: first, heating of the sample which enables the nanoparticles to sink into the PMMA layer [2]; and secondly, spin-coating an additional PMMA layer on top of the sample. Our results show phase contrasts which have been detected for both approaches. Residual topographic effects are discussed, as well as the possibility of phase detection on fully embedded nanoparticles.

[1] García, Ricardo; Pérez, Rubén. Surf. Sci. Rep. 47, 197 (2002)

[2] M. Hanif, R. Juluri, M. Chirumamilla, V. Popok. J. Polym. Sci. B 54, 1152 (2016)