Facile Synthesis of Au/Ni(OH) 2 Nanocomposites and its Application in Nonenzymatic Glucose Sensing
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ORIGINAL PAPER
Facile Synthesis of Au/Ni(OH)2 Nanocomposites and its Application in Nonenzymatic Glucose Sensing Yingzhen Zhang1 • Yingying Song1 • Yancai Li1,2 Received: 5 January 2020 / Accepted: 14 September 2020 Ó Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A simple and environment-friendly autocatalytic reduction process was developed for synthesis of Au/Ni(OH)2 nanocomposites. The nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). It is found the nanocomposites are composed of ultrathin Ni(OH)2 nanosheets and gold nanoparticles (AuNPs), and the AuNPs disperse evenly on the Ni(OH)2 nanosheets. The electrochemical and electrocatalytic properties of the Au/Ni(OH)2 modified glassy carbon electrode (Au/Ni(OH)2/GCE) were investigated by electrochemical experiments. Furthermore, through optimizing Au loading of the nanocomposites, the 5%-Au/Ni(OH)2/GCE displays the best electrocatalytic activity towards glucose oxidization in alkaline medium. Under optimal conditions, the 5%-Au/Ni(OH)2/GCE displays a wide linear range of 0.01 to 3.15 mM (R2 = 0.998) to glucose. Besides, the sensor has a low detection limit of 0.10 lM (S/N = 3) and a high sensitivity of 342.1 lAmM-1cm-2. It also displays satisfying stability, good reproducibility and selectivity. Keywords Au/Ni(OH)2 nanocomposites Electrocatalytic Glucose Nonenzymatic Electrochemical sensor
Introduction It is of great importance to determination of glucose in clinical diagnostics, biotechnology and food industry [1]. In recent years, powerful efforts have been devoted to exploring reliable, precise and fast methods for determination of glucose, such as electrochemical method [2], optical sensing [3], colorimetry [4], conductometry [5] and fluorescent spectroscopy [6], etc. Among various methods, electrochemical technique has been widely developed due to its merits of high sensitivity, low-cost instruments, fast response, and good selectivity. It usually adopts enzymatic or non-enzymatic electrochemical sensor for glucose determination. Among them, the enzyme based
& Yancai Li [email protected] 1
College of Chemistry, Chemical Engineering and Environment, Minnan Normal University, Zhangzhou 363000, People’s Republic of China
2
Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology, Minnan Normal University, Zhangzhou 363000, People’s Republic of China
electrochemical sensor suffers from several serious defects [7], such as fussy immobilization process, extreme operating condition, and also expensive of enzyme, so limited its application. However, nonenzymatic glucose sensor with the advantages of simplicity, selectivity, reproducibility, stability and low cost is very desirable. Therefore, it is very necessary to develop nonenzymatic glucose sensor [8]; accordingly, the synthesis of electrocatalyst for direct oxi
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