Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 54: Nano-optics of metallic and semiconducting nanostructures (experiments II)
O 54.2: Vortrag
Donnerstag, 26. März 2009, 15:15–15:30, SCH A216
Surface enhanced infrared spectroscopy using interacting gold nanowires — •Frank Neubrech1, Daniel Weber1, Hong Shen2, Marc Lamy de la Chapelle3, and Annemarie Pucci1 — 1Kirchhoff-Institut für Physik, Heidelberg, Deutschland — 2Universite Troyes,Troyes, France — 3Universite Paris 13, Bobigny, France
We performed surface enhanced infrared spectroscopy (SEIRS) of molecules adsorbed on gold nanowires using synchrotron light of the ANKA IR-beamline at the Forschungszentrum Karlsruhe (Germany). Arrays of gold nanowires with interparticle spacings down to 30nm were prepared by electron beam lithography. The interparticle distance was reduced further by wet-chemically increasing the size of the gold nanowires. The growth of the wires was proofed using IR spectroscopy as well as scanning electron microscopy.
After this preparation step, appropriate arrays of nanowires with an interparticle distance down to a few nanometers were selected to demonstrate the surface enhanced infrared spectroscopy of one monolayer octadecanthiol (ODT). As know from SEIRS studies using single gold nanowires, the spectral position of the antenna-like resonance in relation to the absorption bands of ODT (2850cm-1 and 2919cm-1) is crucial for both, the lineshape of the molecular vibration and the signal enhancement. In contrast to single nanowires studies, a further increase of the enhanced signals is expected due to the interaction of the electromagnetic fields of the close-by nanowires.