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O: Fachverband Oberflächenphysik
O 56: Nanostructures: Dots, Particles and Clusters
O 56.1: Talk
Wednesday, March 9, 2016, 10:30–10:45, H4
Coherent X-ray Diffraction of Single Epitaxial Nano-Objects — •Thomas F. Keller1,2, Roman Shayduk1, Vedran Vonk1, Arti Dangwal Pandey1, Claudia Neisser3, Irene Fernandez-Cuesta2, Alexey Zozulya1, Michael Sprung1, and Andreas Stierle1,2 — 1Deutsches Elektronen Synchrotron (DESY), Hamburg, Germany — 2Institute for Nanostructure and Solid State Physics, University of Hamburg, Germany — 3Institute for Ion Beam Physics, Helmholtz Center Dresden-Rossendorf, Germany
Controlled nanocatalysis requires novel approaches to understand the size-dependence of catalytic processes. We report on a one-to-one structure analysis of a single platinum (Pt) nanodot-array supported by a strontium titanate STO(100) single crystal by real-space imaging in a scanning electron microscope and in reciprocal space using coherent Bragg diffraction from a focused X-ray beam at PETRA III at DESY.
The Pt nanodot-array was created using a combined lift-off and etching process based on e-beam lithography. Utilizing a transfer and re-positioning protocol using the Pt X-ray fluorescence we localized the 2x2 mu2 array with a center-center distance of 150 nm between single Pt nanodots. The Pt(111) Bragg peak position indicates a preferential Pt(111)/STO(100) orientation. The interference fringes of this peak are typical for coherent diffraction and allow extracting particle shape, size and interparticle distance to compare with the real space imaging.
We propose the use of such nanodot-arrays for future experiments on in-situ oxidation or catalysis as well as for coherent X-ray diffraction of single nano-assemblies under reaction conditions.