Ultrasensitive and selective detection of alkaline-earth metal ions using ion-imprinted Au NPs composites and surface plasmon resonance spectroscopy
| Autor: | Michael Riskin, Yaniv Ben-Amram, Itamar Willner, Ran Tel-Vered, Zhen-Gang Wang |
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| Rok vydání: | 2012 |
| Předmět: |
inorganic chemicals
Alkaline earth metal Ion imprinted Chemistry Metal ions in aqueous solution Inorganic chemistry technology industry and agriculture Nanoparticle 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Ion Yield (chemistry) Composite material 0210 nano-technology Surface plasmon resonance spectroscopy Plasmon |
| Zdroj: | Chem. Sci. |
| ISSN: | 2041-6539 2041-6520 |
| Popis: | Au nanoparticles (NPs) functionalized with electropolymerizable thioaniline units and with dithiothreitol ligands were synthesized. The NPs were electropolymerized onto Au-coated glass surfaces in the presence of the alkaline-earth metal ions Mg2+, Ca2+, Sr2+ or Ba2+, to yield the respective ion-imprinted bis-aniline-bridged Au NPs composites on the Au surfaces. After elimination of the ions from the crosslinked matrices, specific imprinted ion recognition sites were generated in the composites. Selective association of the respective ions to the imprinted sites consisting of the dithiothreitol ligands is demonstrated. The high affinities of the metal ions to the respective imprinted sites lead to impressive sensitivities (fM range). The association of the ions to the imprinted sites is monitored by surface plasmon resonance spectroscopy, and the coupling between the localized plasmon of the NPs and the surface plasmon wave is used as an amplification mechanism. |
| Databáze: | OpenAIRE |
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