Preparation and Electroanalytical Application of Poly(3,4-ethylenedioxythiophene) and Ionic liquid Composite Film Modified Electrodes

[[abstract]]本論文於網版印刷電極上修飾導電高分子 (PEDOT) 與離子液體 ([BMIM][Cl]) ，成功製備出 SPCE/PEDOT/IL 修飾電極，並利用 SEM、ESCA 與 Contact angle 對此修飾電極進行表面鑑定。SPCE/PEDOT/IL修飾電極在 CV 方法下，分別偵測多巴胺 (DA)、尿酸 (UA) 與抗壞血酸 (AA)，其氧化電位分別為 0.23V、0.35 V與0.06V，由此可SPCE/PEDOT/IL修飾電極可將 UA、DA 與 AA 之氧化電位分開。 進一步利用 DPV 方法，在混合液中同時偵測 UA、DA 與 AA，分別對 UA、DA 與 AA 做定量，UA 、DA 與 AA 的線性範圍分別為 8~200μM、8~200 μM 與60~1000μM，其靈敏度分別為0.4291μA/μM 、0.3139μA /μM 與0.0819 μA/μM，而其偵測極限(S/N=3)分別為 0.14、0.19 與 1.10μM。[[abstract]]In this study,ionic liquid and poly (3,4ethylenedioxythiophene) modi?ed screen-printed carbon electrode (SPCE/PEDOT/IL) was prepared . The modi?ed electrode surface was characterized by scanning electron microscopy (SEM)、electron spectroscopy for chemical analysis (ESCA) and contact angle technique. SPCE/PEDOT/IL was employed for the determination of uric acid (UA), dopamine (DA), and ascorbic acid (AA). The oxidation potential are 0.35 V、0.23V and 0.06V for UA, DA and AA, respectively. SPCE/PEDOT/IL displayed excellent electrochemical catalytic activities for the three molecules. By using differential pulse voltammetry, simultaneous determination of UA、DA and AA was achieved. The calibration curves were linear in the 80~200μM、8~200μM and 60~1000μM for UA, DA and AA respectively. The sensitivity are 0.4291μA/μM 、0.3139μA/μM and 0.08μA/μM for UA, DA and AA respectively.The electrochemical sensor shows good detection limits of 0.14 μM、0.19 μM and1.10 μM for UA,DA and AA, respectively.[[note]]碩