Abstract
A copolymer of N-vinylimidazole and N-vinyl-2-pyrrolidone, photo-crosslinked with sulfonated diazidostilbenes, showed swelling/shrinking behaviour due to interaction with divalent metal ions such as Mn2+, Zn2+, Ni2+, and Co2+. 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. Mn2+ turned out to react more rapidly and was detected with 100-fold greater sensitivity than the other investigated ions.
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The authors thank O. Univ. Prof. Dr. Franz Dickert for use of the infrastructure of his research laboratory.
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Kuchler, I., Pittner, F., Pittner, G. et al. Development of a metal-island-coated swelling/shrinking copolymer sensor for measurement of divalent metal ions. Monatsh Chem 141, 131–135 (2010). https://doi.org/10.1007/s00706-009-0243-2
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DOI: https://doi.org/10.1007/s00706-009-0243-2