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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38477

Title: Membrane-Based Assay for Iodide Ions Based on Anti-Leaching of Gold Nanoparticles
Authors: Yu-Wei Shen
Pang-Hung Hsu
Binesh Unnikrishnan
Yu-Jia Li
Chih-Ching Huang
Contributors: 國立臺灣海洋大學:生命科學暨生物科技學系
Keywords: leaching
cellulose membranes
gold nanoparticles
Date: 2014
Issue Date: 2016-09-07T06:09:11Z
Publisher: ACS Apply Materials and Interfaces
Abstract: Abstract: We report a label-free colorimetric strategy for the highly selective and sensitive detection of iodide (I–) ions in human urine sample, seawater and edible salt. A poly(N-vinyl-2-pyrrolidone)-stabilized Au nanoparticle (34.2-nm) was prepared to detect I– ions using silver (Ag+) and cyanide (CN–) ions as leaching agents in a glycine–NaOH (pH 9.0) solution. For the visual detection of the I– ions by naked eye, and for long time stability of the probe, Au nanoparticles (NPs) decorated mixed cellulose ester membrane (MCEM) was prepared (Au NPs/MCEM). The Au NPs-based probe (CN–/Ag+–Au NPs/MCEM) operates on the principle that Ag+ ions form a monolyar silver atoms/ions by aurophilic/argentophilic interactions on the Au NPs and it accelerates the leaching rate of Au atoms in presence of CN– ions. However, when I– is introduced into this system, it inhibits the leaching of Au atoms because of the strong interactions between Ag/Au ions and I– ions. Inductively coupled plasma mass spectrometry, surface-assisted laser desorption/ionization time-of-flight mass spectrometry were used to characterize the surface properties of the Au NPs in the presence of Ag+ and I–. Under optimal solution conditions, the CN–/Ag+–Au NPs/MCEM probe enabled the detection of I– by the naked eye at nanomolar concentrations with high selectivity (at least 1000-fold over other anions). In addition, this cost-effective probe allowed the determination of I– ions in complex samples, such as urine, seawater, and edible salt samples.
Relation: 6(4)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38477
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