A novel functionalized single-wall carbon nanotube modified electrode and its application in determination of dopamine and uric acid in the presence of high concentrations of ascorbic acid

作者：Zhang Yuzhong^*; Pan Yan; Sit Shao; Zhang Liping; Li Shuping; Shao Mingwang

来源：Electroanalysis, 2007, 19(16): 1695-1701.

DOI：10.1002/elan.200703901

• cetylpyridinium bromide
• single-wall carbon nanotube
• layer-by-layer assembly
• uric acid
• dopamine

Multilayer films of negatively charged single-wall carbon nanotubes (SWCNTs) and positively charged cetylpyridinium bromide (CPB) have been deposited on a glassy carbon electrode (GCE) using layer-by-layer (LBL) technique. The assembled multilayer films have been investigated by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and quartz crystal microbalance (QCM) measurements. The voltarnmetric signal of dopamine (DA), uric acid (UA), and ascorbic acid (AA) could be observed well-separated with the assembled SWCNTs/CPB multilayer films in pH 7.0 PBS. The oxidation peak potentials of DA, UA, and AA are centered at about 169 mV, 292 mV and - 10 mV on differential pulse voltammograms (DPVs), respectively. The peak-to-peak potential separation was 123 mV, 179 mV, and 302 mV for DA-UA, DA-AA, and UA-AA in DPVs, respectively. This permits the simultaneous detection of DA and UA in the presence of AA.

• 出版日期2007-8
• 单位安徽师范大学