Mercury(ii)-stimulated oxidase mimetic activity of silver nanoparticles as a sensitive and selective mercury(ii) sensor

Research on oxidase mimics is challenging but important. In this article, mercury(ii) ion enabled citrate-capped silver nanoparticles (Cit-AgNPs) exhibit catalytic activity toward the oxidation of typical chromogenic substrate 3,3',5,5'-tetramethylbenzidine (TMB) by dissolved oxygen under...

Full description

Saved in:
Bibliographic Details
Published inRSC advances Vol. 4; no. 12; pp. 5867 - 5872
Main Authors Wang, Guang-Li, Xu, Xiu-Fang, Cao, Li-Hua, He, Chong-Hui, Li, Zai-Jun, Zhang, Chi
Format Journal Article
LanguageEnglish
Published 2014
Subjects
Alloys
Online AccessGet full text

Cover

More Information
Summary:Research on oxidase mimics is challenging but important. In this article, mercury(ii) ion enabled citrate-capped silver nanoparticles (Cit-AgNPs) exhibit catalytic activity toward the oxidation of typical chromogenic substrate 3,3',5,5'-tetramethylbenzidine (TMB) by dissolved oxygen under mild conditions, suggesting a new type of oxidase mimic. In addition, the oxidase-like activity of Cit-AgNPs was sensitive to the concentration of mercury(ii) ions and selective towards mercury(ii) ions among other metal ions. Based on this, a facile colorimetric mercury(ii) ion sensor was developed. Hg super(2+) was reduced on the surface of Cit-AgNPs to form Hg-Ag alloys. The Hg-Ag alloys activated oxygen and generated superoxide anions, which oxidized TMB. This discovery indicates the potential of nanoparticles for efficient enzyme mimetics.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:2046-2069
2046-2069
DOI:10.1039/c3ra45226c