Abstract
A method of fabricating gold nanocrystals coated polypyrrole (PPy) tubules was developed by coating carboxylic acid–thiol-capped or citrate-reduced gold nanoparticles on polypyrrole tubule templates. Electrostatic interaction between gold nanoparticles and PPy tubules was used as a driving force for this assembly process. The gold nanoparticle coated PPy tubule can be applied as signal-enhancing cuvettes for Raman spectroscopic analysis of trace molecules. The Raman scattering of trace Rhodamine B on the Au nanoparticle-coated tubule was enhanced by a factor of 104–105.
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