EPR, charge transport, and spin dynamics in doped polyanilines

EPR study of polyaniline highly doped by p-toluenesulfonic acid

“…The similar spectral density function was earlier used in the study of spin dynamics in PANI and other conducting polymers [29e34, 55].…”

Influence of disorder on electrical transport and magnetic properties of HCl-doped polyaniline pellets

“…In spite of this, there are still some controversies regarding certain fundamental issues that pertain to the nature of the charge transport and to the origin of χ [5,6]. In general, conductivity of PANI can be controlled over roughly ten orders of magnitude via an acid-doping process, for example using HCl [2].…”

“…In response to different disorder levels, localisation of the electron wave function may vary from sample to sample [7][8][9], which leaves a signature in the measured physical quantities. Experiments on the charge transport [10], structure [11], and magnetic properties [3,5] of bulk PANI samples indicate an intricate co-existence of crystalline and amorphous regions, the size and arrangement of which depend on the sample preparation parameters. The related differences in measured quantities have led to an ongoing debate on whether σ should be attributed to charge transport according to a variable-range hopping (VRH) model [12] or to a granular-metal model [13].…”

Response of l-alanine and 2-methylalanine minidosimeters for K-Band (24GHz) EPR dosimetry

“…Semiconductors, polymers and biological molecules are examples of materials that have been studied by EPR spectroscopy through the detection of paramagnetic species [1][2][3]. The study of radiation damage or radiation effects on these materials by EPR is also a well-known subject [4].…”