Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 34: Poster Session I (Graphene; Plasmonics and nanooptics; Coherence and coherent control in nanophotonics and plasmonics)
O 34.26: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster E
Photochemical metal deposition in nanoporous aluminum oxide matrices — •Julia Katzmann and Thomas Haertling — Fraunhofer Institute for Nondestructive Testing, Maria-Reiche-Str. 2, 01109 Dresden, Germany
Well-ordered arrays of metal nanorods show highly interesting optical properties which make them promising structures for sensor applications [1]. Such arrays can be fabricated via template-based methods at low cost and on large areas.
We report on a proof-of-concept investigation which demonstrates the targeted photochemical deposition [2] of gold into the pores of anodized aluminum oxide (AAO). We exploit a thin layer of gold sputtered onto one side of the AAO membrane as a seed layer for the photochemical process. A solution of HAuCl4 is applied onto the other side of the membrane. Upon UV light irradiation, nanorods grow within the oxide matrix without the need of an electrical contact.
The optical properties of the gold-filled matrices, i.e., the excitation of plasmons in the nanorods were measured by means of optical transmission spectroscopy, while the rod length was determined by scanning electron microscopy. We observe a spectral blue shift of the transversal plasmon resonance with increasing rod length. This finding is correlated with different fabrication parameters to obtain a detailed understanding of the photochemical growth process.
A.V. Kabashin et.al, Nature Materials 8, 857 (2009)
T. Haertling et.al, Optics Express 16, 12362 (2008)