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Plasmonic-coupling-based sensing by the assembly and disassembly of dipycolylamine-tagged gold nanoparticles induced by complexing with cations and anions

Title
Plasmonic-coupling-based sensing by the assembly and disassembly of dipycolylamine-tagged gold nanoparticles induced by complexing with cations and anions
Authors
Li D.X.Zhang J.F.Jang Y.H.Jang Y.J.Kim D.H.Kim J.S.
Ewha Authors
김동하
SCOPUS Author ID
김동하scopus
Issue Date
2012
Journal Title
Small
ISSN
1613-6810JCR Link
Citation
vol. 8, no. 9, pp. 1442 - 1448
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A surface-plasmon-coupling-mediated sensor system is developed based on Au nanoparticles tagged with a coordinative dipycolylamine and lipoyl-anchored naphthalimide derivative (AuNP@DPA). The AuNPs with tailored ligands exhibit distinct sensing activity via sequential assembly into nanoparticle aggregates induced by metal ion complexing, and disassembly in the presence of pyrophosphate (PPi) anions, which is accompanied by a swift, reversible color change due to a surface plasmon resonance coupling effect. It is found that divalent metal ions are more effective than mono- or tri-valent ions in the aggregate formation process, Mn2+-induced aggregates are more sensitive to the capture of PPi anions than other AuNP aggregates, and the disassembly upon anion complexation exhibits a highly selective response. The AuNP@DPA-based molecular recognition system also demonstrates a viable performance for the detection of total selective metal ions present in different types of water analytes. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
DOI
10.1002/smll.201102335
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자연과학대학 > 화학·나노과학전공 > Journal papers
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