Electrically detected and conventional magnetic resonance investigation of surface and bulk states in polyaniline thin films
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Data
2007-04-15
Autores
Castro, Fernando A.
Graeff, Carlos Frederico de Oliveira [UNESP]
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American Institute of Physics (AIP)
Resumo
Electrically detected magnetic resonance (EDMR) and electron paramagnetic resonance (EPR) were used to investigate emeraldine base polyaniline films. The magnetic susceptibility presented a Curie (localized spins)-Pauli (delocalized spins) transition at 240 K, when we also observed a transition in the dependence of the g factor with temperature (T). Peak-to-peak linewidth decreases with increasing temperature, reflecting that motional narrowing limits the hyperfine and dipolar broadening in this polymer. EDMR spectra could only be observed above 250 K in accordance to EPR results. Surface and bulk transport could be separated and their analysis reflected the effect of magnetic interaction with oxygen. (c) 2007 American Institute of Physics.
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Journal of Applied Physics. Melville: Amer Inst Physics, v. 101, n. 8, 5 p., 2007.