AC conductivity and dielectric properties of bulk tungsten trioxide (WO3)

El-Nahass, M.M.; Ali, H.A.M.; Saadeldin, M.M.; Zaghllol, M.

doi:10.1016/j.physb.2012.07.043

Cited by 39 publications

(11 citation statements)

References 9 publications

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“…In general, dielectric loss (3 00 ) arising due to the loss of energy in a dielectric material through conduction (transport-related loss), slow polarization current (bipolar loss) and other deceptive phenomena like interfacial polarization contribution. 22,27,28 At low frequencies, dielectric loss showed the maximum value and was related to water intercalated into the GO. Increase of applied frequency decreases the loss and it approaches the stable value at high frequencies.…”

Section: Resultsmentioning

confidence: 99%

Effect of functional groups on dielectric, optical gas sensing properties of graphene oxide and reduced graphene oxide at room temperature

2015

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Graphene oxide (GO) was synthesized from graphite through a chemical oxidation process and heat treated at 110 and 220 C in a vacuum atmosphere. The partial reduction and sp 3 to sp 2 phase transition of GO was characterized by powder X-ray diffraction, Fourier-transform infrared, micro Raman, ultraviolet-visiblenear infrared spectroscopy techniques. Dielectric properties of pristine GO and heat-treated GO were studied in the frequency range 10 2 to 10 6 Hz at 27 C. Hydroxyl, carboxyl functional groups removed GO after 220 C heat treatment, expressed higher electrical conductivity, dielectric constant and dielectric loss in the order of 10 À2 S m À1 , 10 3 and 10 5 respectively than the pristine GO (10 À6 S m À1 , 10 1 and 10 1 ).Pristine and heat-treated GO were coated on the partially cladding removed poly-methyl methacrylate optical fiber and used as fiber optic gas sensors. GO and heat treated GO coated fibers were responsive to detect ammonia, ethanol and methanol vapors from 0 to 500 ppm at 27 C. Sensitivities of GO coated fiber optic sensor were calculated as À0.32, À0.26 and À0.20 counts per ppm for ammonia, ethanol and methanol vapors respectively. The effect of functional groups on dielectric and gas sensing properties of GO was investigated and reported.

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Section: Resultsmentioning

confidence: 99%

Effect of functional groups on dielectric, optical gas sensing properties of graphene oxide and reduced graphene oxide at room temperature

2015

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“…The temperature dependence of σ a.c. is stronger at low frequencies than at relatively high frequencies. This suggests that σ a.c. is a thermally activated process from different localized states in the gap [23]. The relation exhibits two distinct regions with different slopes.…”

Section: Frequency and Temperature Dependencies Of Ac Conductivitymentioning

confidence: 99%

Structural and frequency dependencies of a.c. and dielectric characterizations of epitaxial InSb-based heterojunctions

et al. 2016

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In this work, heterojunction of InSb/InP was grown by liquid phase epitaxy (LPE). Surface morphology and crystalline structure of the heterojunction were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The frequency and temperature dependences of a.c. conductivity and dielectric properties of the heterojunctions were investigated in the ranges of 100 kHz-5 MHz and 298-628 K, respectively. The a.c. conductivity and its frequency exponents were interpreted in terms of correlated barrier hopping model (CBH), as the dominant conduction mechanism for charge carrier transport. The calculated activation energy, from the Arrhenius plot, was found to decrease with increasing frequency. Experimental results of both dielectric constant ε 1 and dielectric loss ε 2 showed a remarkable dependence of both frequency and temperature.

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“…The impedance spectroscopy is a powerful technique used to investigate dielectric properties of a wide class of materials. − This technique allows to have information on the dispersion of the dielectric constant, related to the molecular properties of the medium under investigation. When the medium is not dispersive, the dielectric constant is frequency-independent.…”

Section: Introductionmentioning

confidence: 99%

Electric Impedance of a Sample of Dielectric Liquid Containing Two Groups of Ions Limited by Ohmic Electrodes: A Study with Pure Water

et al. 2013

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We present a generalization of the Poisson-Nernst-Planck model for a dielectric liquid containing two groups of ions limited by Ohmic electrodes. The theoretical results are used to interpret experimental results of impedance spectroscopy of pure water limited by electrodes of different metallic materials. The agreement between theoretical predictions of the presented model and experimental data obtained with pure water is rather good for all types of electrodes.

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AC conductivity and dielectric properties of bulk tungsten trioxide (WO3)

Cited by 39 publications

References 9 publications

Effect of functional groups on dielectric, optical gas sensing properties of graphene oxide and reduced graphene oxide at room temperature

Effect of functional groups on dielectric, optical gas sensing properties of graphene oxide and reduced graphene oxide at room temperature

Structural and frequency dependencies of a.c. and dielectric characterizations of epitaxial InSb-based heterojunctions

Electric Impedance of a Sample of Dielectric Liquid Containing Two Groups of Ions Limited by Ohmic Electrodes: A Study with Pure Water

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