Journal
RSC ADVANCES
Volume 4, Issue 12, Pages 5867-5872Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra45226c
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Funding
- National Natural Science Foundation of China [21275065, 21005031]
- Fundamental Research Funds for the Central Universities [JUSRP51314B]
- 111 Project [B13025]
- Project of Jiangsu Inspection and Quarantine Bureau [2011KJ17]
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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. Hg2+ 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.
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