title: Ultrasensitive and dual functional colorimetric sensors for mercury (II) ions and hydrogen peroxide based on catalytic reduction property of silver nanoparticles.
abstract: The method provides an innovative dual functional sensors for mercury (II) ions and hydrogen peroxide. The addition of H(2)O(2) to the mixture of silver nanoparticles (AgNPs) and Hg(2+) induced color changes of the solution within several seconds even at 2.0 nM Hg(2+). Other metallic ions could not induce color change even at 10 μM. Of importance, this probe was not only successfully applied to detect Hg(2+), but also it could be used to sense H(2)O(2) at a concentration as low as 50 nM (by naked-eye). The outstanding sensitivity and selectivity property for Hg(2+) and H(2)O(2) resulted from the AgNPs mediated reduction of Hg(2+) to elementary Hg in the presence of H(2)O(2), causing the aggregation and colorimetric response of AgNPs. This sensitive and selective colorimetric assay opens up a fresh insight of development facile and fast detection methods for metal ions and biomolecules using the special catalytic reactivity of AgNPs.
authors.affiliation: School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China. glwang@jiangnan.edu.cn
authors.forename: Guang-Li
authors.initials: GL
authors.lastname: Wang
authors.forename: Xiao-Ying
authors.initials: XY
authors.lastname: Zhu
authors.forename: Huan-Jun
authors.initials: HJ
authors.lastname: Jiao
authors.forename: Yu-Ming
authors.initials: YM
authors.lastname: Dong
authors.forename: Zai-Jun
authors.initials: ZJ
authors.lastname: Li
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D002384:Catalysis; D003124:Colorimetry / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006861:Hydrogen Peroxide / Q000032:analysis* / Q000737:chemistry; D008628:Mercury / Q000032:analysis* / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation*; D010084:Oxidation-Reduction; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012834:Silver / Q000737:chemistry*
chemical_list: D012834:Silver; D006861:Hydrogen Peroxide; D008628:Mercury