title: Metal ion detection with oligo(ethylene glycol) monolayer-modified gold nanoparticles.
abstract: Two colorimetric sensors of gold nanoparticles (AuNPs) modified with different oligo(ethylene glycol)-containing organic molecules have been developed to detect metal ions by ultraviolet-visible (UV-vis) extinction spectroscopy. These sensors display different responses to some metal ions. One exhibits high selectivity for Hg2+ over a variety of competitive metal ions and the other one can respond to a multitude of metal ions. These differences might result from the different functionalized end groups of the modified molecules. Coordination effect, pH response, and ionic strength were investigated to understand the mechanism of the responses to metal ions. The results suggested that the colorimetric responses were mainly induced by the coordination effect of the modified organic molecules and the removing of the modified organic molecules caused by metal ions.
authors.affiliation: Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093, China.
authors.forename: Guangzhao
authors.initials: G
authors.lastname: Li
authors.forename: Bin
authors.initials: B
authors.lastname: Yang
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Lu
authors.forename: Sijing
authors.initials: S
authors.lastname: Xia
authors.forename: Hui
authors.initials: H
authors.lastname: Feng
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Zhu
authors.forename: Anning
authors.initials: A
authors.lastname: Wang
authors.forename: Jin
authors.initials: J
authors.lastname: Zhu
mesh_terms: D003124:Colorimetry; D005026:Ethylene Glycols / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D053768:Metal Nanoparticles / Q000737:chemistry*; D019216:Metals, Heavy / Q000032:analysis*; D009994:Osmolar Concentration; D013056:Spectrophotometry, Ultraviolet
chemical_list: D005026:Ethylene Glycols; D019216:Metals, Heavy; D006046:Gold