Format

Send to

Choose Destination
Analyst. 2015 May 21;140(10):3616-22. doi: 10.1039/c4an02162b. Epub 2015 Apr 10.

Label-free fluorescence detection of mercury ions based on the regulation of the Ag autocatalytic reaction.

Author information

1
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China. zli@ciac.ac.cn.

Abstract

In this work, a novel facile nanoparticle autocatalytic sensor based on the inhibition of the Ag autocatalytic reaction for the determination of Hg(2+) was developed. o-Phenylenediamine (OPD) tended to be oxidized into 2,3-diaminophenazine (OPDox) by silver ions (Ag(+)) followed by the formation of silver nanoparticles (AgNPs). Employed as a catalyst, the thus-formed AgNPs would further promote the reaction between OPD and Ag(+). When Hg(2+) was introduced, Hg(2+) adsorbed on the surface of the AgNPs, thus inhibiting the oxidation process mentioned above and achieving weakened fluorescence intensity. A linear relationship between fluorescence intensity and Hg(2+) concentration (within the range from 10 nM to 2500 nM) was obtained and the detection limit reached as low as 8.2 nM. The proposed method was also applied for the determination of Hg(2+) in real water samples with satisfactory results. The protocol showed excellent advantages of sensitivity and selectivity for Hg(2+) over various metal ions and anions. Meanwhile, this method was simpler and more cost-effective compared with many reported nanomaterial- and DNA-based approaches. Furthermore, an "INHIBIT" logic gate based on the Ag(+)-Hg(2+)-OPD system has also been designed.

PMID:
25859575
DOI:
10.1039/c4an02162b
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Royal Society of Chemistry
Loading ...
Support Center