Data/hora: 09/06/2024 10:44:01

Biblioteca(s): | Embrapa Instrumentação.
Data corrente: | 29/04/2003
Data da última atualização: | 29/04/2003
Autoria: | ALBUQUERQUE, J. E. de; MELO, W. L. B.; FARIA, R. M.
Afiliação: | Universidade Federal de Viçosa, Viçosa, MG; Embrapa Instrumentação Agropecuária, São Carlos, SP; USP-Instituto de Física de São Carlos, SP.
Título: | Photothermal spectroscopy of polyaniline films.
Ano de publicação: | 2002
Fonte/Imprenta: | Molecular Crystals and Liquid Crystals, New York, v. 374, p. 379-384, 2002.
Idioma: | Inglês
Conteúdo: | In this work, we obtained photoacoust spectra (PAS) of undoped and doped poly(o-methoxyaniline) (POMA). The fittings for the PAS spectra are obtained from equation for the photoacoustic signal. For these curves, the thermal parameters obtained from the Photopyroelectric Spectroscopy (PPES) were used. Two Gaussian curves, which fit well the UV-Vis absorption spectrum of undoped POMA, plus a third Gaussina centered at 820nm, which fit well the UV-Vis absorption spectrum of doped POMA, were used for these fittings. The PAS signal was used to obtain the optical characteristics of the POMA films, like the optical absorption coefficient beta and the optical gap between the valence and the molecular exciton band of the undoped POMA. The values of beta in the maximum of the absorption bands agree very well with the intensities of the Gaussian curves used for the PPES fittings. The optical gap obtained here agrees with the value of the literture obtained from the UV-Vis optical absorption.
Palavras-Chave: | Espectroscopia fototérmica; Optical parameters; Parâmetros ópticos; Photothermal spectroscopies; Polianilina; Polyaniline.
Categoria do assunto: | --
Registro original: | Embrapa Instrumentação (CNPDIA)
Exemplares: | CNPDIA - (7476-1) - UPC - SP - -- - PROCI-02.00026 - ALB - 02.0000026 - DIS