| Texto completo | |
| Autor(es): |
Borges, Fernando de M.
[1]
;
da Cunha, Giovanni P.
[2]
;
Dognani, Guilherme
[3]
;
Bacarin, Giovani B.
[3]
;
Cabrera, Flavio C.
[3]
;
Job, Aldo E.
[3]
;
Vega, Maria L.
[2]
;
Matos, Jose M. E.
[1]
;
da Cunha, Helder N.
[2]
Número total de Autores: 9
|
| Afiliação do(s) autor(es): | [1] Univ Fed Piaui, LIMAv, PPGCEM, CT, BR-69049550 Teresina, PI - Brazil
[2] Univ Fed Piaui, Ctr Ciencies Nat, Dept Fis, Campus Univ Min Petronio Portella, BR-64049550 Teresina, PI - Brazil
[3] UNESP, FCT, Dept Fis Quim & Biol, BR-19060900 Presidente Prudente, SP - Brazil
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Materials Chemistry and Physics; v. 237, NOV 1 2019. |
| Citações Web of Science: | 0 |
| Resumo | |
The development of new materials to be employed as active layer in organic semiconductor devices is a highly important research field. Alongside high performance, low cost and environmental safety are among the sought device characteristics. Previously the formation of PAM/Babassu polymer blends with interesting characteristics was reported. In the present work we report improvements on the electric conductivity of capacitor like devices employing Polyaniline (PAni) as active layer by the addition of dichloromaleic anhydride (DCM) during the synthesis of the Babassu-oil based polymer. FT-IR spectra confirm the occurrence of the reaction for the formation of the monoacylglyceride - MAG, the formation of the Polyanhydride (Polydichloromaleic anhydride - PDM) as well as the formation of the PAni/PDM blends. AFM images show that the presence of PDM changes the surface of the thin films, which become more uniform and homogeneous. The direct current (DC) conductivity of the thin films increases by five orders of magnitude as a consequence of a 30% increase in PDM concentration, ranging from approximate to 10(-9) S/m for pure PAni to approximate to 10(-4) S/m for the blend with 30% PDM. Impedance measurements at low electrical field frequency confirm these results; furthermore, the dependence of the complex impedance with the measurement's temperature indicate that the conduction processes are thermally activated. Two distinct conduction processes are present in the blends, as can be seen from the presence of two semi-circles in the complex-plane (Argand diagrams) representations. By employing a simple Havriliak-Negami model we obtained the characteristic relaxation time constants for both processes as a function of temperature, Arrhenius behavior was observed as a function of temperature for both processes. (AU) | |
| Processo FAPESP: | 14/50869-6 - INCT 2014: em Eletrônica Orgânica INEO |
| Beneficiário: | Roberto Mendonça Faria |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |