Synthesis of polymeric thin films by electrochemical polymerization of 1-furfuryl pyrrole: Characterization and charge injection mechanism

• Francisco Brovelli ^[1] ; Bernabé L Rivas ^[2] ; Jean Christian Bernède ^[3]
  1. [1] Universidad del Bío-Bío

     Universidad del Bío-Bío

     Comuna de Concepción, Chile

     
  2. [2] Universidad de Concepción

     Universidad de Concepción

     Comuna de Concepción, Chile

     
  3. [3] University of Nantes

     University of Nantes

     Arrondissement de Nantes, Francia

     

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• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 52, Nº. 1, 2007, págs. 1065-1068
• Idioma: inglés
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  • The polymeric thin film was synthesized by electrochemical polymerization of 1-furfuryl pyrrole on indium tin oxide (ITO) substrates in aprotic organic media. The cyclic voltammograms and DFT calculations indicate that the electrochemical polymerization process would involve pyrrole rings, although oxidation of the furane ring could also take place. The organic thin films were physicochemically characterized by scanning electron microscopy, electron probe microanalysis, and X-ray photoelectron spectroscopy. The surface morphology has shown that the polymer deposition process has high coverage efficiency. The polymeric layer is very thin with an approximate thickness of 150 nm. When the direct bias is applied to the device, the behaviour is ohmic at low voltage; but once an appropriate value is reached, the current begins to increase exponentially. The current-voltage (I-V) curves exhibit rectifying behaviour with a turn-on voltage at 0.70V. The ideality factor n values found are 9-15, indicating disagreement with the model of a standard Schottky contact.The charge injection mechanism in this device was attributed to the tunnelling effect