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共轭型含硫聚席夫碱以碘掺杂后,其宏观导电性会大幅度增加(从10~(-11)S/cm增至10~(-3)S/cm)。为了解释这一掺杂过程的微观变化,对碘掺杂含硫聚席夫碱进行了ESR波谱分析。结果表明,聚合物在掺杂过程中,会形成自旋性阳离子自由基=(?)—(极子)。随着掺杂度提高,聚合物导电性一直增加,而样品中自旋浓度则首先增加,然后逐渐降低,表明由掺杂而形成的极子会部分地转变为无自旋的双极子。还探讨了聚合物掺杂过程中ESR峰形及线宽的变化原因。
Conjugated sulfur-containing Schiff base doped with iodine, macroscopic conductivity will greatly increase (from 10 ~ (-11) S / cm to 10 ~ (-3) S / cm). In order to explain the microscopic changes of this doping process, ESR spectra of iodine-doped Sulfonated Schiff bases were carried out. The results show that during the doping process, the polymer will form a radical cation = (?) - (polar). As the doping level increases, the conductivity of the polymer increases. However, the spin concentration in the sample increases first and then decreases gradually, indicating that the doping of the polaron will partially transform into spinless dipole. The reasons for the change of ESR peak shape and line width during polymer doping were also discussed.