Facile Preparation of Graphene Dots Functionalized Au Nanoparticles and Their Application as Peroxidase Mimetics in Glucose Detection

doi:10.6023/A14020138

Acta Chimica Sinica ›› 2014, Vol. 72 ›› Issue (6): 713-719.DOI: 10.6023/A14020138 Previous Articles Next Articles

Article

石墨烯量子点功能化金纳米粒子的制备及作为过氧化物模拟酶用于葡萄糖检测

郭颖, 李午戊, 郑敏燕, 黄怡

咸阳师范学院化学与化工学院咸阳 712000

投稿日期:2014-02-26 发布日期:2014-04-25
通讯作者: 郭颖 E-mail:guoying207@126.com
基金资助:
项目受国家自然科学基金（No.21275096）和陕西省教育厅科学研究计划（No.2010JK898）资助.

Facile Preparation of Graphene Dots Functionalized Au Nanoparticles and Their Application as Peroxidase Mimetics in Glucose Detection

Guo Ying, Li Wuwu, Zheng Minyan, Huang Yi

College of Chemistry & Chemical Engineering, Xianyang Normal University, Xianyang 712000

Received:2014-02-26 Published:2014-04-25
Supported by:
Project supported by the National Natural Science Foundation of China (No.21275096) and the Scientific Research Plan Projects of Education Department of Shaanxi Province (No.2010JK898).

Based on the reducing property of graphene dots, we developed a facile strategy to synthesize well-stable graphene dots functionalized Au nanoparticles (denoted as GQD@AuNP) by one-step process at low temperature without added protecting agent.The prepared GQD@AuNP were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV-vis absorption spectra.It was found that the as-prepared GQD@AuNP are spherical and monodisperse with an average diameter of ca.10 nm.Graphene dots not only act as a mild reductant to reduce HAuCl₄, but also as a capping agent to endow the GQD@AuNP with good stability in aqueous solvent and monodispersity and restrains the Au crystal growth, making the particles have narrow size distribution.Furthermore, the as-prepared GQD@AuNP showed an excellent intrinsic peroxidese-like activity, which could catalyze oxidization of 3,3',5,5'-tetramethylbiphenyl (TMB) by H₂O₂ to produce a colour variation.Using TMB as substrate, we systematically studied the effect of a series of conditions, such as temperature and pH, on the catalytic activity of the as-prepared GQD@AuNP.Results of electron paramagnetic resonance (ESR) suggest that the catalyse-mimic activity of the GQD@AuNP like HRP and effectively catalyzed the decomposition of H₂O₂ into ^·OH radicals.On this basis, a highly sensitive and rapid colorimetric and visualization method was developed for glucose in blood samples, when combined with glucose oxidase (GOx).Under optimum conditions, the proposed method allowed the detection of glucose in the range of 2.0×l0^-6 to 4.0×l0^-5 mol·L^-1 with detectable glucose as low as 3.0×l0^-7 mol·L^-1.Furthermore, another three sugars existing in the human serum, including maltose, fructose and lactose were detected by this method, which indicated the little disturbance by maltose and fructose, while no remarkable signals were observed for the lactose.This proposed method has been successfully applied to detect glucose in serum samples with good accuracy and precision.

Key words: graphene dots, Au nanoparticles, peroxidase mimetics, glucose

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Guo Ying, Li Wuwu, Zheng Minyan, Huang Yi. Facile Preparation of Graphene Dots Functionalized Au Nanoparticles and Their Application as Peroxidase Mimetics in Glucose Detection[J]. Acta Chimica Sinica, 2014, 72(6): 713-719.

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石墨烯量子点功能化金纳米粒子的制备及作为过氧化物模拟酶用于葡萄糖检测

Facile Preparation of Graphene Dots Functionalized Au Nanoparticles and Their Application as Peroxidase Mimetics in Glucose Detection

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