Charge transport of lithium-salt-doped polyaniline

J. H. Jung, B. H. Kim, B. W. Moon, Jinsoo Joo, S. H. Chang, K. S. Ryu

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Charge transport properties, including temperature-dependent dc conductivity and thermoelectric power are reported for Li-salt (LiPF6, LiBF4, LiAsF6, LiCF3SO3, or LiCIO4) -doped polyaniline (PAN) samples. The experiments of electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) are performed for the systems. The electrical and magnetic properties and the doping mechanism of various Li-salt-doped PAN samples are compared with those of hydrochloric-acid (HCl) -doped PAN samples. The PAN materials doped with LiPF6 have the highest dc conductivity (σdc∼1 S/cm, at room temperature) in the Li-salt-doped PAN systems studied here. The temperature dependence of σdc of the systems follows a quasi-one-dimensional variable range hopping model, which is similar to that of HCl-doped PAN samples. As the molar concentration increases from ∼ 10-4M to ∼ 1M, the system is transformed from an insulating to conducting (non-metallic) state. From EPR experiments, we measure the temperature dependence of magnetic susceptibility, and obtain the density of states for various Li-salt-doped PANs with different doping levels. We observe the increase of the density of states as the molar concentration increases. From the analysis of nitrogen 1s peak obtained from XPS experiments, we estimate the doping level of the systems. We compare the effective doping thickness between HCl-doped PAN samples and Li-salt-doped PAN ones, based upon the results of XPS argon (Ar) ion sputtering experiments. The diffusion rate of Li+ or counterions and the dissociation constants of Li salt in doping solution play an important role for the effective doping and transport properties of the Li-salt-doped PAN samples.

Original languageEnglish
Article number035101
Pages (from-to)0351011-0351018
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number3
Publication statusPublished - 2001 Aug 15

Fingerprint

Polyaniline
Lithium
Charge transfer
Salts
lithium
salts
Doping (additives)
hydrochloric acid
Hydrochloric Acid
Hydrochloric acid
photoelectron spectroscopy
X ray photoelectron spectroscopy
electron paramagnetic resonance
transport properties
Transport properties
Paramagnetic resonance
conductivity
temperature dependence
x rays
polyacrylonitrile

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Jung, J. H., Kim, B. H., Moon, B. W., Joo, J., Chang, S. H., & Ryu, K. S. (2001). Charge transport of lithium-salt-doped polyaniline. Physical Review B - Condensed Matter and Materials Physics, 64(3), 0351011-0351018. [035101].

Charge transport of lithium-salt-doped polyaniline. / Jung, J. H.; Kim, B. H.; Moon, B. W.; Joo, Jinsoo; Chang, S. H.; Ryu, K. S.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 64, No. 3, 035101, 15.08.2001, p. 0351011-0351018.

Research output: Contribution to journalArticle

Jung, JH, Kim, BH, Moon, BW, Joo, J, Chang, SH & Ryu, KS 2001, 'Charge transport of lithium-salt-doped polyaniline', Physical Review B - Condensed Matter and Materials Physics, vol. 64, no. 3, 035101, pp. 0351011-0351018.
Jung JH, Kim BH, Moon BW, Joo J, Chang SH, Ryu KS. Charge transport of lithium-salt-doped polyaniline. Physical Review B - Condensed Matter and Materials Physics. 2001 Aug 15;64(3):0351011-0351018. 035101.
Jung, J. H. ; Kim, B. H. ; Moon, B. W. ; Joo, Jinsoo ; Chang, S. H. ; Ryu, K. S. / Charge transport of lithium-salt-doped polyaniline. In: Physical Review B - Condensed Matter and Materials Physics. 2001 ; Vol. 64, No. 3. pp. 0351011-0351018.
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