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IJPAP Vol.47(07) [July 2009] >


Title: Electrical and optical properties of azo dye
Authors: Aziz, M S
El-Mallah, H M
Keywords: Azo dye
Electrical properties
Optical properties
Issue Date: Jul-2009
Publisher: CSIR
Abstract: The electrical and optical properties of azo dye (1-phenylazo-2-naphthol) have been investigated. It has been found that the ac conductivity σac(ω) depends on the temperature and frequency. The ac conductivity as a function of frequency has been described by a power law with the frequency exponent s. The obtained values of s > 1 increase with increasing temperature up to T <373 K and then slightly decrease. The results obtained have been described by the nearly constant loss (NCL) behaviour. The dielectric constant ε and dielectric loss ε' depend on the temperature below elastic temperature Te and frequency F > 30 kHz and is nearly constant beyond. Both frequency and temperature dependence of the dielectric constant ε' and dielectric loss ε' have been attributed to interfacial and orientational polarization, respectively. The optical constants such as refractive index n, the dispersion energy Ed, the oscillation energy Eo, the room temperature optical dielectric constant ЄL, the high frequency dielectric constant at infinite wavelength Є and the ratio of carrier concentration to the effective mass N/m* have been determined using optical spectra. The spectra of refractive index n, exhibit two peaks and two shoulders at energies 1.455, 2.313, 2.731 and 2.385 eV, respectively.
Page(s): 530-534
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.47(07) [July 2009]

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