文摘
Highly single-crystalline ruthenium dioxide (RuO2) nanoneedles were successfully grown on polycrystalline electrospun titanium dioxide (TiO2) nanofibers for the first time by a combination of thermal annealing and electrospinning from RuO2 and TiO2 precursors. Single-crystalline RuO2 nanoneedles with relatively small dimensions and a high density on electrospun TiO2 nanofibers are the key feature. The general electrochemical activities of RuO2 nanoneedles鈥揟iO2 nanofibers and Ru(OH)3-TiO2 nanofibers toward the reduction of [Fe(CN)6]3鈥?/sup> were carefully examined by cyclic voltammetry carried out at various scan rates; the results indicated favorable charge-transfer kinetics of [Fe(CN)6]3鈥?/sup> reduction via a diffusion-controlled process. Additionally, a test of the analytical performance of the RuO2 nanoneedles鈥揟iO2 nanofibers for the detection of a biologically important molecule, hydrogen peroxide (H2O2), indicated a high sensitivity (390.1 卤 14.9 渭A mM鈥? cm鈥? for H2O2 oxidation and 53.8 卤 1.07 渭A mM鈥? cm鈥? for the reduction), a low detection limit (1 渭M), and a wide linear range (1鈥?000 渭M), indicating H2O2 detection performance better than or comparable to that of other sensing systems.
