界面聚合法合成手性掺杂剂诱导螺旋形聚苯胺纳米纤维

以手性试剂D-樟脑磺酸(D-CSA)和L-樟脑磺酸(L-CSA)为掺杂剂和构象诱导剂,采用界面聚合法合成了螺旋形聚苯胺纳米纤维。通过FESEM、TEM、FTIR和UV-Vis吸收光谱等测试技术对螺旋形聚苯胺纳米纤维结构进行了表征。结果表明,所得聚苯胺纤维具有螺旋形构象,形貌均一,平均直径约为50nm,长度为300～600nm,具有较高的长径比(6:1～12:1)。在水溶液中,聚苯胺纳米纤维以伸展的螺旋形分子链构象存在,调节溶液的pH值,螺旋形聚苯胺纳米纤维表现出可逆的掺杂和脱掺杂性质。循环伏安(CV)测试表明,螺旋形聚苯胺纳米纤维在0.5mol/LHCl溶液中表现出良好的电化学活性。

Preparation of Helical Polyaniline Nanofibers by Interface Polymerization with Chiral Regents as Dopants and Conformation Inducer

Helical polyaniline nanofibers were prepared by a facilel interface polymerization method with chiral regents D- and L-camphorsulfonic acid(D- and L-CSA) as dopants and conformation inducer. The as-prepared helical polyaniline nanofibers were characterized by FESEM, TEM, FTIR, UV-Vis spectroscopies. The results show that relatively uniform polyaniline nanofibers with a helical conformation and higher ratio of length to diameter(6∶1~12∶1) could be readily obtained by means of this method, the average diameter and the lengths were about 50 nm and in a range of 300~600 nm, respectively. The helical polyaniline nanofibers exist in more expanded coil molecular conformation in aqueous solution and show reversible doping dedoping nature along with the change of pH value of solution. Cyclic voltammetry tests show that the helical polyaniline nanofibers exhibit good electrochemical activity in a 0.5 mol/L HCl aqueous solution.