聚苯胺红外反射谱随氯化氢掺杂量的变化

掺杂种类和掺杂量的不同可使聚苯胺的光学性质发生很大的变化．利用盐酸挥发的HCl气体对聚苯胺自支持薄膜进行了掺杂，并测量了不同掺杂浓度的薄膜在不同入射角下的红外反射谱（4000cm-1～400cm-1）．结果表明：掺杂使干涉程度明显减弱、干涉峰向长波方向移动、反射率先上升后下降，而且不同入射角反射谱的相对强度也会有一定程度的改变．通过实测数据分析与计算机模拟对比证明：在低掺杂浓度时，随着掺杂程度的提高，消光系数上升较快，当掺杂浓度较高时，消光系数上升缓慢；在整个掺杂过程中，折射率基本保持一个较慢的上升趋势．

Variation of infrared reflectance spectrum of polyaniline with hydrogen chloride dopant concentration

Optical property of polyaniline may be greatly changed by doping materials and concentra- tions. In our work, polyaniline free-standing films were doped by hydrogen chloride gas volatilized from hydrochloric acid. Infrared reflectance spectrum（4 000 cm-1-400 cm-1） of the films with dif- ferent doping concentration was recorded under different angle of incidence. The results show that dopant will greatly reduce the interference intensity. The interference peaks move to the direction of the longer wavelength. With increasing doping concentration, the reflectivity increases at first, then decreases. Ratio of reflectivities with different angle of incidence also changed. The measured data were compared with the calculated ones. It is found that at low doping, the extinction coefficient in- creases rapidly with the increasing doping concentration. As the doping is further increased, the in- creasing gets slower. While the refractive index slowly increases with increasing doping concentration in the whole range.