Dresden 2006 – scientific programme

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O: Oberflächenphysik

O 26: Particles and clusters I

O 26.3: Talk

Tuesday, March 28, 2006, 16:15–16:30, WIL A317

Growth of supported gold nanoparticles: the influence of substrate material, temperature, and laser irradiation — •N. Borg, D. Blázquéz-Sánchez, C. Hendrich, H. Ouacha, F. Hubenthal, and F. Träger — Institut für Physik and Center for Interdisciplinary Nanostructure Science and Technology - CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, D-34132 Kassel

In order to tailor the optical properties of metal nanoparticles (NPs) for different applications, a variety of parameters must be considered and can be changed. Here, the substrate material as well as its temperature during growth has been varied systematically to clarify the influence of these parameters. Gold nanoparticles (AuNPs) with radii ranging from 0.5 to 12 nm were prepared under ultrahigh vacuum conditions by deposition of gold atoms on quartz, sapphire and titanium dioxide substrates followed by Volmer-Weber-growth. As a consequence of this self-organised assembly we obtained NP ensembles with a broad size and shape distribution where the shape is strongly correlated to the size of the NP. We measured the influence of the substrate material, and the temperature on the shape of the particles. In addition, the method of laser assisted growth has been applied to further tailor the NPs. This technique was developed in our group and takes advantage of the optical properties of metal NPs to overcome the correlation between the shape and the size, the objective being to produce NPs with desired, well-defined shapes and variable sizes. Depending on the wavelength and the fluence of the laser light we can stabilise the mean axial ratio of the AuNPs at values ranging from 0.19 to 0.98 independent of size.