三维网络状PANI纤维的制备及对VC的电化学检测

Preparation of Three-Dimensional Networked PANI Nanofiber and the Electrochemical Detection of VC

以苯胺为单体,在添加了聚(2-丙烯酰胺-2-甲基丙磺酸/丙烯酰胺)(P(AMPS-AM))模板溶液中,采用化学氧化法合成聚苯胺(PANI),研究了P(AMPS-AM)模板含量对聚苯胺(PANI)的结构、形貌和电化学性能的影响。采用FTIR、UV-vis、FESEM、XRD和TG-DSC等测试方法对样品进行了分析,并且,用四探针法对样品进行电导率的测定,通过循环伏安法和方波伏安法对PANI的电化学性能进行了测试。结果表明,当P(AMPS-AM)模板的含量为2.0 g时,PANI的结晶度较高,为三维网络状纳米纤维结构,电导率达到1.91 S/cm,热稳定性较高,其修饰电极对维生素C(VC)具有较好的电催化活性,在VC浓度为0.18~0.54 mmol/L的范围内,响应峰电流与VC的浓度成线性关系。

Using aniline as monomer,polyaniline(PANI)was synthesized in aqueous solution containing poly(2-acrylamide-2-methylpropane sulfonic acid/acrylamide)(P(AMPS-AM))template.The effects of the amount of P(AMPSAM)on the structure,morphology,and electrochemical properties of PANI were investigated.The samples were characterized by FTIR,UV-Vis,FESEM,XRD and TG-DSC.The electrical conductivity of PANI was tested by four-point probe tester.The electrochemical properties of PANI were tested by cyclic voltammetry and square wave voltammetry.The results showed that the crystallinity and thermostability of the obtained PANI were excellent when the amount of P(AMPSAM)was 2.O g.The PANI presented a three-dimensional networked structure and its electrical conductivity was the best,reaching 1.91 S/cm.The Glassy carbon electrode modified with PANI nanofibers showed good electrocatalytic activity for vitamin C(VC).In the range of 0.18 to 0.54 mmol/L,the response peak current was linear with the concentration of VC.