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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38495

Title: Synthesis of Photoluminescent Au NDs–PNIPAM Hybrid Microgel for the Detection of Hg2+
Authors: Li-Yi Chen
Chung-Mao Ou
Wei-Yu Chen
Chih-Ching Huang
Huan-Tsung Chang
Contributors: 國立臺灣海洋大學:生命科學暨生物科技學系
Keywords: poly(N-isopropylacrylamide)
gold nanodots
mercury detection
microgel
photoluminescent
Date: 2013
Issue Date: 2016-09-07T08:26:03Z
Publisher: ACS Applied Materials and Interfaces
Abstract: Abstract: Poly(N-isopropylacrylamide) microgels (PNIPAM MGs) incorporated with photoluminescent gold nanodots (Au NDs) have been prepared and employed for the detection of mercury ions (Hg2+). Each of the PNIPAM MGs (hydrodynamic diameter 615 ± 15 nm) contains several Au NDs (diameter 1.8 ± 0.2 nm) in the Au ND–PNIPAM MGs. Like Au NDs, Au ND–PNIPAM MGs exhibit an absorption band at 375 nm that is assigned for ligand to metal charge transfer mixed with metal centered (ds/dp) states and photoluminescence at 520 nm originated from Au ND/polynuclear gold(I)–thiolate (core/shell) complexes. Purification of Au ND–PNIPAM MGs relative to Au NDs is much easier through a simple centrifugation/wash process. On the basis of Hg2+-induced photoluminescence quenching due to the formation of Au–Hg amalgam and formation of Au ND–PNIPAM MGs aggregates, the signal response of Au ND–PNIPAM MGs against Hg2+ concentration is linear over a range from 2 to 20 nM (r = 0.9945). This selective approach provides limits of detection for Hg2+ (at a signal-to-noise ratio of 3) of 1.9 and 1.7 nM in phosphate buffer solutions (5 mM, pH 7.0) with and without containing 500 mM NaCl, respectively. This selective and sensitive Au ND–PNIPAM MG probe has been applied to the determination of the concentration of Hg in a representative fish sample, showing its practical potential for monitoring of Hg levels in complicated biological and environmental samples.
Relation: 5(10)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38495
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