期刊
BIOSENSORS & BIOELECTRONICS
卷 77, 期 -, 页码 372-377出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2015.09.046
关键词
Urea sensor; Non-enzymatic; Ni-Co oxide; 3D graphene; Urine
类别
资金
- Gyeonggi Regional Research Center [GRRC2009-A01]
A NiCo2O4 bimetallic electro-catalyst was synthesized on three-dimensional graphene (3D graphene) for the non-enzymatic detection of urea. The structural and morphological properties of the NiCo2O4/3D graphene nanocomposite were characterized by X-ray diffraction, Raman spectroscopy, and scanning electron microscopy. The NiCo2O4/3D graphene was deposited on an indium tin oxide (ITO) glass to fabricate a highly sensitive urea sensor. The electrochemical properties of the prepared electrode were studied by cyclic voltammetry. A high sensitivity of 166 mu A mM(-1) cm(-2) was obtained for the NiCo2O4/3D graphene/ITO sensor. The sensor exhibited a linear range of 0.06-0.30 mM (R-2=0.998) and a fast response time of approximately 1.0 s with a detection limit of 5.0 mu M. Additionally, the sensor exhibited high stability with a sensitivity decrease of only 5.5% after four months of storage in ambient conditions. The urea sensor demonstrates feasibility for urea analysis in urine samples. (C) 2015 Elsevier B.V. All rights reserved.
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