标题：A glassy carbon electrode modified with gold nanoparticle-encapsulated graphene oxide hollow microspheres for voltammetric sensing of nitrite
作者：Zhang, Fuhua; Yuan, Yawen; Zheng, Yiqun; Wang, Hua; Liu, Tonghao; Hou, Shifeng
作者机构：[Zhang, Fuhua; Yuan, Yawen] Shandong Univ, Sch Chem & Chem Engn, Jinan 250100, Shandong, Peoples R China.; [Zhang, Fuhua; Yuan, Yawen; Zheng, Yiqun; 更多
通讯作者：Hou, SF;Hou, SF
通讯作者地址：[Hou, SF]Shandong Univ, Natl Engn Res Ctr Colloidal Mat, Jinan 250100, Shandong, Peoples R China;[Hou, SF]Jining Res Ctr Carbon Nanomat, Jining 272100 更多
关键词：Composite materials; AuNPs; Cyclic voltammetry; Spray drying;; Electrocatalysis
摘要：Reduced graphene oxide hollow microspheres (rGO HMS) were encapsulated with gold nanoparticles (AuNPs) by spray drying. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Raman spectroscopy were used to characterize the AuNP/rGO HMS. When placed on a glassy carbon electrode (GCE), it exhibits excellent electrochemical catalytic properties towards the oxidation of nitrite. The electrocatalytic properties were studied using various electrochemical techniques. Compared to AuNP-decorated graphene sheet based electrodes documented in the literature, the one presented here provides a larger surface area. This enhances the catalytic activity towards nitrite. The electrode, typically operated at a working potential of 0.82 V (vs. SCE), has a linear response in the 5.0 mu M to 2.6 mM nitrate concentration range, and a detection limit as low as 0.5 mu M (at an S/N ratio of 3).