Dresden 2009 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 14: POSTERS Nanoparticles

CPP 14.8: Poster

Dienstag, 24. März 2009, 14:00–16:30, P3

Characterization of optical active nanostructures on silicon — •Thomas Baumgärtel, Harald Graaf, and Christian von Borczyskowski — Center of Nanostructured Materials and Analytics, TU Chemnitz, 09107 Chemnitz, Germany

Anchoring optically active molecules on nanostructured surfaces is a promising step towards building complex structures with variable properties and functions. Recently we could demonstrate that nanostructures on silicon surfaces can be functionalized in a neat way through selective binding of dye molecules and nanoparticles [1]. Here we report on the characterization of nanostructures on silicon that have been optically functionalized by binding of cationic dye molecules. The nanostructures were created by AFM-induced local anodic oxidation of dodecyl-terminated silicon. The two cationic dyes rhodamine 6G and cresyl violet have been selectively attached to nanostructures via electrostatic interactions and were studied using wide-field and confocal microscopy. The spectrum of the bound dyes indicates the existence of two different species of molecules: some of the molecules show the same spectral emission compared to dye molecules in solution, for other molecules there is a clear blue-shift of the emission wavelength. The bleaching behaviour of the dyes on to the structure follows a biexponential decrease pointing also towards two different species of bound dyes.

[1] H. Graaf, M. Vieluf, and C. von Borczyskowski, Nanotechnology 18, 265306 (2007)