One-step electrochemical synthesis of pure poly(2,5-dicyano-p-phenylenevinylene) films |
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Authors: | Garcia Jarem R Peres Laura O Fernandes Mauro R Gruber Jonas Nart Francisco C |
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Institution: | (1) Instituto de Química de São Carlos, Universidade de São Paulo, Av. do Trabalhador Sancarlense 400, 13560-970 São Carlos, SP, Brazil;(2) Instituto de Química, Universidade de São Paulo, C. Postal 26077, CEP 05599-970 São Paulo, SP, Brazil |
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Abstract: | In this communication we describe the electrochemical synthesis of poly(2,5-dicyano-p-phenylenevinylene) (DCNPPV) polymer films on indium tin oxide substrates. We investigate the purity, morphology, absorption and emission properties of the film. The purity was checked by infrared spectroscopy. The film formed presented spectroscopic purity equivalent to the chemically prepared PPV that was dialyzed for one week. Scanning electron microscopy of the surface revealed a grain-like morphology. The absorption and emission spectra showed absorption and emission bands at 420 nm and 575 nm, respectively, with the absorption onset at 422 nm, which corresponds to an energy gap of 2.25 eV. The electrochemical determination of the energy gap gives 2.05 eV, thus quite close to the optical energy gap at the onset of absorption. The EA and IP were determined by electrochemical measurements and are 3.46 eV and 5.51 eV, respectively. |
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Keywords: | Conducting polymers Poly(2 5-dicyano-p-phenylenevinylene) Electrochemical synthesis Poly(p-phenylenevinylene) |
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