Graphitic carbon nitride(g-C3N4)is prepared by pyrolysis of melamine.The structure is characterized by XRD and SEM.The treated g-C3N4 droplets are coated onto the surface of the bare electrode.Cu/g-C3N4 modified glassy carbon electrode(GCE)is prepared by electrodepositing Cu on g-C3N4 coated electrode.It is found that Cu/g-C3N4 modified glassy carbon electrode has a strong electrocatalytic oxidation effect on dopamine(DA).At the concentration ranges of DA is 4.8×10-7～1.0×10-5 mol/L,the fabricated sensor shows a good linear relationship with the oxidation peak current.The linear equation illustrated as Ipa(uA)=-7.416-0.272c(μmol/L)and the correlation coefficient is 0.9944.The detection limit is down to 1.1×10-8 mol/L.The influence of interfering substances on DA determination is investigated.Results show that the sensor has great selectivity,good stability and reproducibility.
万方数据