▎ 摘　　要

An amperometric, nano/micro-structured sensor for fast and sensitive detection of dopamine is proposed. The sensor was fabricated directly by gold nanoparticles decorated three-dimensional graphene foam (GNP-3DG). The gold nanoparticles with an average diameter of 46.5 nm were electrochemically deposited on the 3D graphene surfaces. Scanning electron microscopy, Raman spectroscopy and energy dispersive spectroscopy were utilized for morphological and elemental characterizations of GNP-3DG. Compared with bare 3DG, GNP-3DG exhibited enhanced electro-oxidation activity occurred on GNP-3DG. Under optimized experimental conditions, the fabricated GNP-3DG showed good stability and provided fast (around 10 s) and sensitive response to dopamine with a linear range from 0.1 to 120 mu M and a limit of detection of 0.13 nM. Furthermore, the resulted sensor displayed excellent anti-interference ability, good reproducibility and long-term stability. All these results demonstrated that GNP-3DG would provide wide range of bioelectrochemical applications in diverse research areas.