Nano Archive

Surface-enhanced Raman effect in ultra-thin CuPc films employing periodic silver nanostructures

Ludemann, Michael and Brumboiu, Iulia E. and Gordan, Ovidiu D. and Zahn, Dietrich R. T. (2011) Surface-enhanced Raman effect in ultra-thin CuPc films employing periodic silver nanostructures. Journal of Nanoparticle Research, 13 (11). pp. 5855-5861.

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Abstract

In order to investigate the interaction of organic molecules with metals by means of Raman spectroscopy, special substrates were designed which combine interference and surface-enhancement mechanisms. Triangular shaped silver nanostructures with an angle bisector and a height of about 80 nm were prepared by nanosphere lithography on silicon substrates with a 100-nm oxide layer. Utilizing these substrates the dependence of the Raman signal intensity on the thickness of copper phthalocyanine (CuPc) was studied in the range from few percentages of a monolayer coverage up to 80 nm using an in situ setup. At an excitation in resonance with the plasmons of the nanostructures (2.6 eV) an increase of the signal was observed during film growth. Contrary to that, excitation at 1.92 eV in resonance with the CuPc absorption band leads to a strongly enhanced Raman signal for submonolayer coverage which hardly changes with the CuPc film thickness in the ultra-low coverage regime.

Item Type:Article
ID Code:11501
Deposited By:Prof. Alexey Ivanov
Deposited On:05 Jan 2012 09:30
Last Modified:05 Jan 2012 09:42

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