Journal
ACS NANO
Volume 4, Issue 4, Pages 1790-1798Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn100315s
Keywords
graphene; nitrogen doping; electrocatalysis; direct electrochemistry; biosensing
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Funding
- Pacific Northwest National Laboratory (PNNL)
- U.S. Department of Energy's (DOE's) Office of Biological and Environmental Research [DE-AC05-76RL01830]
- National Natural Science Foundation of China [20975060]
- National Basic Research Program of China [2007CB310500]
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Chemical doping with foreign atoms is an effective method to intrinsically modify the properties of host materials. Among them, nitrogen doping plays a critical role in regulating the electronic properties of carbon materials. Recently, graphene, as a true two-dimensional carbon material, has shown fascinating applications in bioelectronics and biosensors. In this paper, we report a facile strategy to prepare N-doped graphene by using nitrogen plasma treatment of graphene synthesized via a chemical method. Meanwhile, a possible schematic diagram has been proposed to detail the structure of N-doped graphene. By controlling the exposure time, the N percentage in host graphene can be regulated, ranging from 0.11 to 1.35%. Moreover, the as-prepared N-doped graphene has displayed high electrocatalytic activity for reduction of hydrogen peroxide and fast direct electron transfer kinetics for glucose oxidase. The N-doped graphene has further been used for glucose biosensing with concentrations as low as 0.01 mM in the presence of interferences.
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