Nafion/Quercetin/Graphene composite-modified glassy electrode for selective and sensitive detection of dopamine
Glassy carbon electrode (GCE) was modified using graphene (G),quercetin (Qu) and Nation in this sequence to fabricate Nafion-Qu-G composite-modified GCE (Nafion/Qu/G/GCE).The as-prepared modified electrode combining the advantages of Nation,Qu and G was employed for the selective and sensitive detection of dopamine (DA) in the presence of ascorbic acid (AA)and uric acid (UA).Compared with GCE,Qu/GCE,G/GCE and Qu/G/GCE,the Nafion/Qu/G/GCE was more electroactive and selective for DA.Differential pulse voltammetry (DPV) was used for electrochemical detection,the separations of the oxidation peak potentials for AA-DA and DA-UA were about 304 mV and 136 mV,which allowed selectively determining DA.In phosphate buffer solution (PBS) of pH 6.8,the Nation/Qu/G/GCE provided a detection limit of 2.31×10-8 mol/L (S/N=3) for DA.Linearity (R=0.9963) of the peak currents against the concentration of DA was found over the range of 1.0× 10-7 to 1.0× 10-3 mol/L.Furthermore,the modified electrode exhibited good reproducibility and stability.
graphene quercetin Nation dopamine differential pulse voltammetry
Dai-min Song Jian-fei Xia Zong-hua Wang Yan-zhi Xia Fei-fei Zhang Lin-hua Xia
Laboratory for New Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, Qi College of Chemical and Environmental Engineering, Qingdao University, Shandong 266071,China
国际会议
厦门
英文
841-844
2012-12-28（万方平台首次上网日期，不代表论文的发表时间）