Abstract
A gold nanoparticle (AuNPs)-based simple and fast colorimetric sensor for selectivedetecting of Pb(II) in aqueous solution has been developed. Monodisperse AuNPs(approx. 2.0 nm diameter) has been prepared facilely and further modified with analkanethiol-bearing monoazacrown ether terminus. These AuNPs are shown to selectively sensePb2 + through color change, which is visually discernible by an appearance of the surface plasmonband (SPB) at 520 nm. The recognition mechanism is attributed to the unique structure ofthe monoazacrown ether attached to AuNPs and metal sandwich coordination between twoazacrown ether moieties that are attached to separate nanoparticles. This inter-particlecross-linking results in an aggregation and apparent color change from brownto purple. Additionally, TEM experiments support the optical absorption dataproving the aggregation between azacrown ether-capped gold nanoparticles. ThisAuNP-based colorimetric assay is a facile and robust method and allows fast detection ofPb2 + at ambient temperatures. More importantly, the developed technique does not utilizeenzymatic reactions, light-sensitive dye molecules, lengthy protocols or sophisticatedinstrumentation.
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