Abstract
A copolymer of N-vinylimidazole and N-vinyl- 2-pyrrolidone, photo-crosslinked with sulfonated diazi- dostilbenes, showed swelling/shrinking behaviour due to interaction with divalent metal ions such as Mn 2? ,Z n 2? , Ni 2? , and Co 2? . This effect was used to set up a resonance enhanced absorption chip; a solution of the copolymer in methanol, stabilized with the radical scavenger 2,6-di-t- butyl-4-methylphenol, was spin-coated onto a silanized aluminum chip and then sputtered with gold nanoparticles. The change in layer thickness caused by the interaction of ions with the copolymer interlayer resulted in a shift of the maxima of the reflection spectrum to lower wavelengths and thus also a visible colour change. This spectral shift was logarithmically related to the concentration of metal ions. Mn 2? turned out to react more rapidly and was detected with 100-fold greater sensitivity than the other investigated ions.
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