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Nanoporous alumina enhanced surface plasmon resonance sensors

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5 Author(s)
Koutsioubas, Alexandros G. ; Department of Physics, University of Patras, GR 26 500, Greece ; Spiliopoulos, Nikolaos ; Anastassopoulos, Dimitris ; Vradis, Alexandros A.
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The signal enhancement of an easy to fabricate, nanoporous alumina assisted surface plasmon resonance (SPR) sensor is investigated. It is theoretically shown that the presence of a thin (under 200 nm) porous alumina layer on top of an aluminum film supporting the surface plasmons, may significantly increase (over one order of magnitude) the sensitivity of the SPR method in the case where the adsorption of relatively small molecules is probed. The comparative experimental investigation of self-assembled monolayer formation on planar metal films and porous alumina layers verifies the theoretical predictions. Based on these results, we discuss the extended applicability of this setup in biosensor and other related applications.

Published in:

Journal of Applied Physics  (Volume:103 ,  Issue: 9 )

Date of Publication:

May 2008

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