Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 36: Postersitzung (Elektronische Struktur, Grenzfl
äche fest-flüssig, Halbleiteroberfl
ächen und -grenzfl
ächen, Nanostrukturen, Oberfl
ächenreaktionen, Teilchen und Cluster, Struktur und Dynamik reiner Oberfl
ächen)
O 36.73: Poster
Montag, 7. März 2005, 15:00–18:00, Poster TU F
Surface enhanced infrared absorption (SEIRA) of spherical gold nanoparticles on SiO2 — •Dominik Enders1, Andreas Priebe1, Swen Rupp1, Alexander Küller2, Gerhard Fahsold1, and Annemarie Pucci1 — 1Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg — 2Angewandte Physikalische Chemie, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg
The properties of spherical gold nanoparticles with regard to SEIRA were studied in IR transmission-, IRRAS- and ATR geometry. The gold nanoparticles were prepared by citrate reduction of HAuCl4 and deposited on the SiO2 surface by immersion of the samples (respectively the ATR crystal) into the nanoparticle solution. Time resolved ATR measurements of the SiO2-water interface during deposition of the nanoparticles on the SiO2 surface show, that the absorption peaks of the water molecules increasingly get enhanced, as the nanoparticles assemble on the surface. Furthermore, an estimation of the enhancement factor is made by comparing IR transmission spectra of antibodies on nanoparticles/SiO2 to IRRAS spectra of antibodies on 40 nm thick reflective gold films.