Controlled functionalization of flexible graphene fibers for the simultaneous determination of ascorbic acid, dopamine and uric acid

Flexible graphene fibers were controlled synthesized and further functionalized by NiCo 2 O 4 nanowires. The novel sensors were used directly as working electrode for the simultaneous determination of ascorbic acid (AA), dopamine (DA), and uric acid (UA). The detection limits (S/N   =   3) of 50   μM, 0.1   μM, 0.2   μM were obtained for AA, DA and UA in PBS, respectively. Due to the synergistic effect between the high conductivity of graphene fiber and the catalytic activity of NiCo 2 O 4 , the as-prepared composite fibers showed excellent performance. This research may offer new ways to synthesize graphene based fibers for the determination of molecules.