Department of Chemical and Bio Engineering, Gachon University, Gyeonggi-do 461-701, Republic of Korea.
Department of Chemical and Bio Engineering, Gachon University, Gyeonggi-do 461-701, Republic of Korea.
Biosens Bioelectron. 2016 Mar 15;77:372-7. doi: 10.1016/j.bios.2015.09.046. Epub 2015 Sep 25.
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 μAmM(-)(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 µM. 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.
一种 NiCo2O4 双金属电催化剂被合成在三维石墨烯（3D 石墨烯）上，用于非酶检测尿素。NiCo2O4/3D 石墨烯纳米复合材料的结构和形态特性通过 X 射线衍射、拉曼光谱和扫描电子显微镜进行了表征。NiCo2O4/3D 石墨烯沉积在铟锡氧化物（ITO）玻璃上，以制造高灵敏度的尿素传感器。通过循环伏安法研究了制备电极的电化学性能。NiCo2O4/3D 石墨烯/ITO 传感器的灵敏度高达 166 μAmM(-)(1)cm(-)(2)。该传感器的线性范围为 0.06-0.30 mM（R(2)=0.998），响应时间约为 1.0 s，检测限为 5.0 µM。此外，该传感器在环境条件下储存四个月后，灵敏度仅下降 5.5%，表现出较高的稳定性。尿素传感器在尿样中的尿素分析中具有可行性。
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