Au nanoparticles on tryptophan-functionalized graphene for sensitive detection of dopamine

作者：Lian Qianwen; Luo Ai; An Zhenzhen; Li Zhuang; Guo Yongyang; Zhang Dongxia; Xue Zhonghua; Zhou Xibin^*; Lu Xiaoquan

来源：Applied Surface Science, 2015, 349: 184-189.

DOI：10.1016/j.apsusc.2015.04.217

• Gold nanoparticle
• Tryptophan
• Graphene
• Electrochemical deposition
• Dopamine

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 mu M), a low detection limit (0.056 mu M, 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.

• 出版日期2015-9-15
• 单位西北师范大学