Journal
BIOSENSORS & BIOELECTRONICS
Volume 34, Issue 1, Pages 125-131Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2012.01.030
Keywords
Nitrogen doped graphene; Electrochemical sensor; Simultaneous determination; Ascorbic acid; Dopamine; Uric acid
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Funding
- National 973 Basic Research Program [2012CB933804]
- National Natural Science Foundation of China [21035002]
- National Science Fund for Creative Research Groups [21121091]
- Natural Science Foundation of Jiangsu province [BK2010009]
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Nitrogen doped graphene (NG) was prepared by thermally annealing graphite oxide and melamine mixture. After characterization by atomic force microscopy and X-ray photoelectron spectroscopy etc., the electrochemical sensor based on NG was constructed to simultaneously determine small biomolecules such as ascorbic acid (AA), dopamine (DA) and uric acid (UA). Due to its unique structure and properties originating from nitrogen doping. NC shows highly electrocatalytic activity towards the oxidation of AA, DA and UA. The electrochemical sensor shows a wide linear response for AA. DA and UA in the concentration range of 5.0 x 10(-6) to 1.3 x 10(-3) M, 5.0 x 10(-7) to 1.7 x 10(-4) M and 1.0 x 10(-7) to 2.0 x 10(-5)M with detection limit of 2.2 x 10(-6) M, 2.5 x 10(-7) M and 4.5 x 10(-8) M at S/N = 3, respectively. These results demonstrate that NC is a promising candidate of advanced electrode material in electrochemical sensing and other electrocatalytic applications. (C) 2012 Elsevier B.V. All rights reserved.
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