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Surface plasmon resonance sensor for Hg(II) detection by binding interactions with polypyrrole and 2-mercaptobenzothiazole by Jorn C.C. Yu; Edward P.C. Lai; Susan Sadeghi is a Engineering article available to read on EtoBox.

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A SPReeta sensor was developed for Hg(II) detection by monitoring the binding interactions with polypyrrole (PPy) and 2-mercaptobenzothiazole (2-MBT). Chemical binding of Hg 2+ ions in water with a PPy thin film immobilized on the gold surface could be monitored by surface plasmon resonance (SPR). The SPR angle was found to be a useful analytical signal for monitoring the binding interaction. An increase in SPR angle of 780 ± 10 RU (1 RU = 1 × 10 -4• ) was obtained for 10 ppm Hg 2+ biding with PPy film, and a linear dynamic range was observed between 0.1 and 10 ppm. After Hg 2+ absorption into the polymer, enhancement of the SPR detection sensitivity was achieved by adding 2-MBT to the injected solution. This produced further binding interaction with the Hg 2+ bound on PPy. The detection limit was improved down to 0.01 ppm with a SPR angle increase of 20 ± 10 RU. It should be recognized that both 2-MBT and PPy worked together in the present SPReeta method to enhance the specificity of Hg 2+ determination.

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Author

Jorn C.C. Yu; Edward P.C. Lai; Susan Sadeghi

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0925-4005)

Published

2004

Language

EN

Field

Engineering (Physical Sciences)