A Fiber-Optic Sensor Based on Plasmon Coupling Effects inGold Nanoparticles Core-Satellites Nanostructures for Detection of Mercury Ions
10.11895/j.issn.0253-3820.160777
- VernacularTitle:基于纳米金Core-satellites等离子体耦合增强效应的汞离子光纤传感器的研究
- Author:
Shuo JIA
;
Chao BIAN
;
Jianhua TONG
;
Jizhou SUN
;
Shanhong XIA
- Keywords:
Localized surface plasmon resonance;
Gold nanoparticles core-satellites structure;
Deoxyribonucleic acid;
Mercury ion (Ⅱ);
Optical fiber sensor
- From:
Chinese Journal of Analytical Chemistry
2017;45(6):785-790
- CountryChina
- Language:Chinese
-
Abstract:
Based on the plasmon coupling effect in gold nanoparticles core-satellite nanostructures linked by thymine(T)-rich DNA hybridization and the specific Hg2+-mediated T-Hg2+-T base pair, a novel localized surface plasmon resonance (LSPR) optical fiber sensor was proposed and developed for Hg2+ detection in water.The Hg2+-induced conformational change in T-rich DNA sequence inhibited the DNA hybridization reaction, weakened the plasmon coupling effect and leaded to the change of LSPR resonance wavelength.The concentration of Hg2+ was quantitatively determined by the resonance wavelength redshift.The linear range of Hg2+ detection was about 5-150 nmol/L with LOD about 3.4 nmol/L.The specificity of the sensor was proved great by evaluating the response to other heavy metal ions such as Zn2+, Mg2+, Pb2+ and so on.This sensor was applied in environmental water detection by standard addition method,with the RSD less than 4.8% and recoveries of 94.2%-105.4%.
