Poly(3,4-ethylenedioxythio-phene):poly(styrenesulphonate) (PEDOT:PSS) nanofibres were first prepared via electrospinning method. Microstructural arrangement of the nanofibres was investigated by scanning electron microscopy technique. Then, the effect of beta irradiation with different absorbed doses on their impedance spectra were investigated in the frequency range from 5 to 13 × 10⁶. It was observed that beta irradiation leads to a considerable decrease in both real and imaginary parts of the complex dielectric function, and alternating current conductivity of the nanofibres. The obtained frequency dependent conductivity data were discussed in terms of pair approximation. It was established that, for all beta irradiation doses, the frequency dependence of the conductivity is characterized by the presence of four frequency regions with different slopes. Analysis of the impedance data revealed that chain scission via chain cross-linking and free radical formation are most likely mechanisms for changes in impedance parameters. Two clear semicircles in Nyquist plot have been successfully explained by employing two parallel R-CPE equivalent circuits in series configuration. An overall evaluation of the obtained data indicates that electrospun PEDOT:PSS nanofibres have great potential for the development of highly sensitive impedance-based beta radiation sensor.

聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）纳米纤维首先通过静电纺丝方法制备。通过扫描电子显微镜技术研究了纳米纤维的微观结构排列。然后，在 5 到 13 × 10 ⁶的频率范围内研究了不同吸收剂量的 β 辐照对其阻抗谱的影响. 观察到β辐射导致复合介电函数的实部和虚部以及纳米纤维的交流电导率显着降低。所获得的频率相关电导率数据根据对近似进行了讨论。已经确定，对于所有的 β 辐射剂量，电导率的频率依赖性的特征在于存在四个具有不同斜率的频率区域。阻抗数据分析表明，通过链交联和自由基形成引起的断链是阻抗参数变化的最可能机制。通过采用串联配置的两个并联 R-CPE 等效电路，已成功解释了奈奎斯特图中的两个清晰半圆。