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Palumbo, M. ; Nagel, J. ; Petty, M. C.
Surface Plasmon Resonance Detection of Metal Ions: Layer-by-Layer Assembly of Polyelectrolyte Sensing Layers on a Multichannel Chip

A single-chip multichannel surface plasmon resonance sensor (SPR) has been used to detect metal ions in aqueous solutions. The equipment was designed around a commercial light-emitting diode and a CCD camera and incorporated no moving parts. The sensing materials were based on molecular architectures of polyelectrolyte films, deposited by the layer-by-layer self-assembly technique. Two bilayer architectures, poly(ethyleneimine) (PEI)/poly(ethylenealt-maleic acid) and PEI/poly(styrenesulfonate), were shown to produce different responses to solutions containing copper, nickel, and iron. The SPR equipment was able to measure concentrations of these metals down to levels of at least 2/spl times/10/sup -5/ M.

IEEE Sensors Journal 5, 1159-1164


Erschienen am
December 2005
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