Citation:
XIA Chang, HAI Xin, CHEN Shuai, CHEN Xu-Wei, WANG Jian-Hua. Preparation of Graphene Quantum Dots/Ag Nanoparticles Nanocomposites for Colorimetric Detection of H2O2 and Glucose[J]. Chinese Journal of Analytical Chemistry,
;2016, 44(1): 41-48.
doi:
10.11895/j.issn.0253-3820.150568
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Graphene quantum dots/Ag nanoparticles nanocomposite (GQDs/AgNPs) was prepared via in-situ growth of AgNPs on the surface of GQDs, in which GQDs served as both reducing agent and stabilizer. The as-prepared nanocomposites were mono-dispersed with an average diameter of less than 30 nm. The obtained GQDs@AgNPs nanocomposites exhibited excellent intrinsic peroxidese-like activity, which could catalyze the oxidization of 3,3',5,5'-tetramethylbenzidine (TMB) by H2O2 to produce a colour product. Steady-state kinetic assays showed that the catalytic activity of GQDs/AgNPs towards H2O2 fitted well with typical Michaelis-Menten kinetic model, followed by the ping-pong mechanism. Compared with the horseradish peroxidase (HRP), GQDs/AgNPs showed higher affinity towards TMB and H2O2 substrate. Based on the intrinsic peroxidese-like activity of GQDs/AgNPs nanocomposites and the production of H2O2 after the oxidation of glucose, a colorimetric method was developed for the detection of H2O2 and glucose, along with detection limit of 0.18 μmol/L and 1.6 μmol/L, respectively. The present method was applied to the detection of glucose in human serum, and the obtained results agreed with that obtained by reference method.
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