Abstract
A NiFe alloy nanoparticle/graphene oxide hybrid (NiFe/GO) was prepared for electrochemical glucose sensing. The as-prepared NiFe/GO hybrid was characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results indicated that NiFe alloy nanoparticles can be successfully deposited on GO. The electrochemical glucose sensing performance of the as-prepared NiFe/GO hybrid was studied by cyclic voltammetry and amperometric measurement. Results showed that the NiFe/GO-modified glassy carbon electrode had sensitivity of 173 μA mM−1 cm−2 for glucose sensing with a linear range up to 5 mM, which is superior to that of commonly used Ni nanoparticles. Furthermore, high selectivity for glucose detection could be achieved by the NiFe/GO hybrid. All the results demonstrated that the NiFe/GO hybrid has promise for application in electrochemical glucose sensing.
Highlights
IntroductionGlucose sensing is important in many fields, such as medical diagnostics and the food industry [1]
Glucose sensing is important in many fields, such as medical diagnostics and the food industry [1].The earliest glucose sensing was reported by Clark and Lyons in 1962, using a biological enzyme [2].Since biological enzymes such as glucose oxidase and glucose dehydrogenase have been widely used for glucose sensing
Biological enzymes are susceptible to external conditions such as temperature, humidity, and pH, among others, which lead to the instability of the biological enzymes [3,4,5]
Summary
Glucose sensing is important in many fields, such as medical diagnostics and the food industry [1]. The expensive price and complicated mobilizing methods of biological enzymes restrict their application [6] To address these problems, the research focus has been transferred to the development of electrochemical nonenzymatic glucose sensors. 2004 because of their good electrical conductivity and large specific surface area Due to these exceptional properties, graphene and GO have often been chosen as the supporting material in electrochemistry [33]. To the best of our knowledge, the NiFe alloy nanoparticle/graphene oxide hybrid (NiFe/GO) has never been reported for electrochemical glucose sensing. The NiFe/GO hybrid reveals better electrocatalytic performance towards glucose oxidation than the commonly used Ni NPs. The high performance of NiFe alloy nanoparticles and the superior conductivity of GO endow the NiFe/GO biosensor with the capacity to achieve the electrochemical sensing of glucose in a wide concentration range
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