1. Au nanoparticles on tryptophan-functionalized graphene for sensitive detection of dopamine.
- Author
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Lian, Qianwen, Luo, Ai, An, Zhenzhen, Li, Zhuang, Guo, Yongyang, Zhang, Dongxia, Xue, Zhonghua, Zhou, Xibin, and Lu, Xiaoquan
- Subjects
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GOLD nanoparticles , *TRYPTOPHAN , *GRAPHENE , *DOPAMINE , *MICROFABRICATION - Abstract
A novel and uniform gold nanoparticles/tryptophan-functionalized graphene nanocomposite (AuNPs/Trp-GR) has been successfully fabricated by directly electrochemical depositing gold onto the surface of tryptophan-functionalized graphene (Trp-GR). The nanostructure of AuNPs/Trp-GR was characterized by using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). It was demonstrated that Au nanoparticles were well dispersed on the surface of Trp-GR which might attribute to the more binding sites provided by Trp-GR for the formation of Au nanoparticles. The electrocatalytic activity of the AuNPs/Trp-GR towards the dopamine (DA) was systematically investigated using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Under optimum conditions, a wide and valuable linear range (0.5–411 μM), a low detection limit (0.056 μM, S/N = 3), good repeatability and stability were obtained for the determination of DA. Furthermore, the modified electrode was successfully applied to real samples analysis. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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