Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)

O 29.22: Poster

Mittwoch, 29. März 2006, 14:30–17:30, P2

Fabrication and characterization of gold nanocrystals for use as probes in the diffracted x-ray tracking technique — •Armin Brechling, Jawad Slieh, Wiebke Hachmann, Ulf Kleineberg, and Ulrich Heinzmann — University of Bielefeld, Molecular and Surface Science, D-33615 Bielefeld

Diffracted x-ray tracking (DXT), a new single molecule experiment, uses x-rays to monitor the rotating motions of a labeled nanocrystal. This technique has the potential to resolve intramolecular conformation changes in the scale of few picometers with a time resolution in the ms interval [1].

For this technique it is essential to prepare stable, highly ordered nanocrystals. Further it is advantageous to use a biocompatible material. Gold is a suitable material in biophysical studies because it can be directly linked to the thiol groups of cystein in protein molecules [2].

We report the fabrication of dispersive gold nanocrystals using a vacuum evaporation technique. Gold has been evaporated under ultra high vacuum conditions on a freshly cleaved NaCl (100) surface at a substrate temperature of approximately 350^∘C. The substrate with the gold layer, grown in an island-type structure, was subsequently dissolved in an aqueous CHAPS-solution in order to get dispersed gold crystals.

The gold nanocrystals have been characterized by means of different techniques such as Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM) and X-Ray Diffraction (XRD).

[1] Y. C. Sasaki et al. Phys. Rev. Lett. 87 (2001) 248102-1

[2] Y. C. Sasaki et al. Biophys. J. 72 (1997) 1842