Journal
TALANTA
Volume 107, Issue -, Pages 55-60Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2012.12.055
Keywords
Polynucleotide-templated silver nanoclusters (DNA-AgNCs); Graphene; Hydrogen peroxide
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Funding
- NSFC [21222507, 21175036, 21005090, 21075031]
- 973 Program [2009CB421601, 2011CB911002]
- Program for New Century Excellent Talents in University [NCET-10-0366]
- NSFHP [10JJ2005]
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A novel, sensitive and enzymeless electrochemical sensor based on polynucleotide-templated silver nanoclusters (DNA-AgNCs)/graphene composite film was developed for the detection of hydrogen peroxide. The graphene modified glassy carbon electrode (GCE) was employed because graphene has several advantages including excellent conductivity, biocompatibility, and large surface area to volume ratio. In addition, it was found that DNA-AgNCs have remarkable electrocatalytic activity toward the reduction of hydrogen peroxide, and can be easily immobilized onto the surface of the graphene/GCE by pi-pi stacking. The sensor based on the (DNA-AgNCs)/graphene/GCE exhibited a rapid response (ca. 3 s), a low detection limit (3 mu M), a wide linear range from 15 mu M to 23 mM, high selectivity, as well as good repeatability. Moreover, the common interfering species, such as ascorbic acid, uric acid, dopamine, glutathione, and L-cysteine, did not result in any interference. This present work may expand the use of silver nanoclusters in the field of electrochemical sensor. (C) 2013 Elsevier B.V. All rights reserved.
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