Structural properties of KxV2O5.nH2O nanocrystalline films

Negm, Samia E.; Mady, H.A.; Moghny, A. S. Abdel; Abd-Rabo, A.S.; Bahgat, A. A.

doi:10.1016/j.solidstatesciences.2010.12.031

Cited by 5 publications

(7 citation statements)

References 16 publications

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“…Current results indicated that all films are composed of highly oriented nanocrystalline rod-like shape of size ranging from 9.7 to 14.7 nm as reported recently by us in Ref. [11]. On the other hand the electrical transport properties indicate a nonadiabatic small polaron hopping conduction mechanism this together with that the system is n-type semiconductor within the temperature range investigated [12].…”

Section: Dispersion Curves Of Refractive Index and Extinction Coefficsupporting

confidence: 76%

“…Films of the investigated compounds were prepared by sol-gel technique (colloidal route) [11]. The powder of vanadium pentoxide (V 2 O 5 ) (99.99%) and potassium hydroxide (KOH) (99.99%) in suitable proportions (mol %) were used as raw materials.…”

Section: Experimental Techniquesmentioning

confidence: 99%

“…Recently the nanocrystalline structure [11] as well as the transport properties [12] of a series of K x V 2 O 5 ÁnH 2 O films, where (0 B x B 0.0091) were investigated. Current results indicated that all films are composed of highly oriented nanocrystalline rod-like shape of size ranging from 9.7 to 14.7 nm as reported recently by us in Ref.…”

Section: Dispersion Curves Of Refractive Index and Extinction Coefficmentioning

confidence: 99%

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Study of optical properties of highly oriented nanocrystalline V2O5·nH2O films doped with K ions

Mady

Negm

Moghny

et al. 2012

J Sol-Gel Sci Technol

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Optical transmission and reflection measurements of highly oriented nanocrystalline K x V 2 O 5 ÁnH 2 O films (0 B x \ 0.01) were studied. The optical constants such as, refractive index, the extinction coefficient, absorption coefficient, optical band gap have been calculated. The optical spectra of all samples exhibited two distinct regions of optical gap, E op1 suggesting a direct allowed transition with optical gap ranging from 0.37 up to 0.42 eV and E op2 suggesting a direct forbidden transition with optical gap ranging from 2.02 up to 2.23 eV. This indicates that K x V 2 O 5 ÁnH 2 O films have more than one type of conduction mechanism.

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Section: Dispersion Curves Of Refractive Index and Extinction Coefficsupporting

confidence: 76%

Section: Experimental Techniquesmentioning

confidence: 99%

Section: Dispersion Curves Of Refractive Index and Extinction Coefficmentioning

confidence: 99%

See 1 more Smart Citation

Study of optical properties of highly oriented nanocrystalline V2O5·nH2O films doped with K ions

Mady

Negm

Moghny

et al. 2012

J Sol-Gel Sci Technol

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“…On the other hand, the increase in the density with increasing sodium content may be due to the loss of intercalated water molecules, of less molecular weight, Na ions of higher molecular weight on the average. This is together with the increase of the attractive interactions between the positively charged sodium ions and the negatively charged V2O5 layers [2, 10,17]. The concentration of composition N (cm -3 ) may be evaluated using the density by the relation:…”

Section: Results and Discussion 31 Temmentioning

confidence: 99%

“…The values of WH and εP are given in Table 2. The density of state at Fermi level can be estimated from the following expression [17]; (11) The results for the present samples are listed in Table 2. The values of N(EF) are reasonable for localized states.…”

Section: 0e-3 24e-3 28e-3 32e-3 36e-3 1/t (K )mentioning

confidence: 99%

Influence of sodium excess in nanocrystalline xNa-(80-x)V2O5-20MoO3.nH2O thin films on their electrical and structural properties

2016

Egyptian Journal of Solids

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Nanocrystalline thin film of xNa-(80-x)V2O5-20MoO3.nH2O xerogel obtained by sol gel synthesis. Transimition electron microscopy (TEM), density, electrical properties and thermoelectric power of the as prepared nanocrystalline xNa-(80-x)V2O5-20MoO3.nH2O xerogel thin films (8 ≤ x ≤ 26 mol%) were investigated. These films have been produced by the sol-gel technique (colloidal route). TEM revealed that the samples have nanorods. The particle size was found to be about 10.1 nm. The density of the samples increases with increasing Nacontent. The samples are changes in thermoelectric power from n-type to ptype semiconductors with increasing Na-content. The electrical conductivity shows that all samples are semiconductor and it increases with increasing Nacontent and the activation energy decreases with increasing Na-content. From the best fits, reasonable values of various small polaron hopping parameters were obtained. The electrical conduction at T > θD/2 was due to non-adiabatic SPH.

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Synthesis, structural and transport properties of NaxV2O5⋅nH2O xerogel nanocrystalline thin films

El‐Desoky

Al-Assiri

Bahgat

2014

Journal of Alloys and Compounds

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Structural properties of KxV2O5.nH2O nanocrystalline films

Cited by 5 publications

References 16 publications

Study of optical properties of highly oriented nanocrystalline V2O5·nH2O films doped with K ions

Study of optical properties of highly oriented nanocrystalline V2O5·nH2O films doped with K ions

Influence of sodium excess in nanocrystalline xNa-(80-x)V2O5-20MoO3.nH2O thin films on their electrical and structural properties

Synthesis, structural and transport properties of NaxV2O5⋅nH2O xerogel nanocrystalline thin films

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