聚苯胺的电导率、电子顺磁共振和磁化率

本文报导了还原前后聚苯胺的电导率和电子顺磁共振强度随温度的变化。从logσ对1/T图得到了还原后的聚苯胺的能量间隙为0.252eV,它的不成对电子密度约为1.84×10~(23)m~(-3),或1.06×10~(20)kg~(-1),它的电导率与温度的关系式为σt=σ20-9.17×10~(-4)(20-t)Scm~(-1)。还原前的聚苯胺的电导率在20℃以上随温度升高而下降,在20℃以下,其电导率随温度升高而增加,它的不成对电子密度约为2.55×10~(27)m~(-3),或1.47×10~(24)kg~(-1)。两种聚苯胺的电子顺磁共振的强度和峰值-峰值之间的宽度△Hp-p都随温度而变化。还原前的聚苯胺的磁化率在不同温度下均为零。

CONDUCTIVITY,ELECTRON SPIN RESONANCE AND SUSCEPTIBILITY OF POLYANILINE

The changes in the conductivity and electron spin resonance intensity of polyaniline before and after reduction with temperature have been reported. The energy band gap E_g of polyaniline after reduction is 0.252 eV which was obtained from the plot of logσ vs.1/T, its unpaired electron density is approximately 1.84×10~(23)m~(-3) or 1.06×10~(20)kg~(-1), its conductivity-temperature relation is given by σ_t= σ_(20)-9.17×10~(-4) (20-t) S.m~(-1). The conductivity of polyaniline before reduction decreases with rising temperature above 20 ℃ and increases with rising temperature below 20 ℃. Its unpaired electron density is approximately 2.55×10~(27)m~(-3) or 1.47×10~(24)kg~(-1). The density and peak-peak linewidth ΔH_(p-p) of the electron spin resonance of both forms of polyaniline change with temperature. Each of susceptibility of polyaniline before reduction is zero at the different temperatures.