Electrical resistivity and magnetoresistivity of protonic acid (h2SO4 and HCl)-doped polyaniline at low temperature
✍ Scribed by M. Ghosh; A. Barman; A. K. Meikap; S. K. De; S. Chatterjee; S. K. Chattopadhyay
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 146 KB
- Volume
- 75
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Electrical-transport properties of protonic acid (H 2 SO 4 and HCl)-doped polyaniline (PANI) in an aqueous ethanol medium were investigated in the temperature range 1.8 K Յ T Յ 300 K and in a magnetic field up to 8 T. The room-temperature resistivity of HCl-doped PANI is larger than that of H 2 SO 4 -doped PANI. The resistivity ratios r ϭ (1.8 K)/(300 K) of the samples are high. The samples in the insulating region show a crossover from a Mott to an Efros-Shklovskii variable range hopping conduction at T ϭ 9.8 K for H 2 SO 4 -doped PANI and 8.5 K for HCl-doped PANI. The magnetoresistivity of these samples is also explained by the variable range hopping theory. The different physical parameters were calculated from the experimental data.