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

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

doi:10.1007/s10971-012-2675-0

Cited by 12 publications

(14 citation statements)

References 23 publications

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“…Transient electronics ubiquitously requires a transient power supply. 3,9 Compared to many battery electrode materials which are already potentially transient in triggering materials (e.g. KOH solution), vanadium oxide (V 2 O 5 ) is chosen for this work due to its higher capacity 10,11 and faster transient behaviour in alkaline.…”

Section: Resultsmentioning

confidence: 99%

“…PVP is commonly referred to as a water-soluble polymer, where the dissolution of PVP nanofibers in water occurs immediately with a dissolution rate dependent on the alkalinity of the solution; meanwhile, V 2 O 5 reacts with the alkaline solution to form a slightly yellow solution indicative of K x V 2 O 5 . 9 Traditional battery separators are based on microporous polyolefin membrane materials, 10,11 which are normally not suitable for transient energy storage because they are limited by their dissolution in aqueous solution. The polymer PVP was chosen as the base battery separator material and fabricated using an electrospinning technique.…”

Section: Resultsmentioning

confidence: 99%

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Cut-and-stack nanofiber paper toward fast transient energy storage

Liu

Wang

et al. 2016

Inorg. Chem. Front.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Cut-and-stack nanofiber paper toward fast transient energy storage

Liu

Wang

et al. 2016

Inorg. Chem. Front.

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“…Figure 19 illustrates the plotted graph of the real dielectric constant ε 1 with the λ 2 . Where it shows the relation is linear at higher wavelengths (Mady et al 2012). The extrapolation of these linear parts on the y-axis gives the value of ε ∞ as shown in Fig.…”

Section: Dispersion Energy Parameters and Effective Massmentioning

confidence: 90%

“…Making thin films of nanocrystalline material can be easily achieved using the sol-gel technique. And vanadium pentoxide gels are a good candidate for optical and electronic devices (Ramana et al 1997;Bahgat et al 2011;Mady et al 2012) as it exhibits its semiconducting properties from electron transfer between V 4+ and V 5+ ions (Wright 1984;Takeda et al 1996). The optical transmittance spectrum of V 2 O 5 sol-gel exhibit a characteristic absorption band at a wavelength of about 500 nm and it has a steady transmittance of 75% in the visible region.…”

Section: Introductionmentioning

confidence: 99%

Characterization and optical properties of reduced graphene oxide doped nano-crystalline vanadium pentoxide

2020

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In this paper, the structural and optical properties of reduced graphene oxide (rGO) doped vanadium pentoxide nanocrystalline films were studied. rGO was synthesized using modified Hummer method and confirmed by EDX, XRD and HRTEM. XRD measurements showed good fit with known card JCPDS 40-1296 of vanadium pentoxide with nanocrystals structure oriented toward the c-axis. The line of (002) in XRD graphs is getting weaker by the addition of rGO till nearly missing at the higher concentrations indicating intercalation of rGO within the vanadium layers. The average particle size measured decreased with increasing rGO content from 4.86 to 3.17 nm. Optical properties were studied by measuring the absorption, reflectance and transmittance of the prepared samples using doublebeam UV-Vis spectrophotometers. The optical constants like refractive index n, extinction coefficient k, real and imaginary dielectric constants, absorption coefficient α, and optical band gap E op of the nanocrystalline films have been evaluated. The absorption coefficient decreases with increasing rGO content, which may be attributed to decrease in lattice distortion owing to rGO content due to the decrease of particle size as indicated in the XRD and HRTEM. Optical measurements revealed that there are two different optical gaps present. The optical gap Eop 1 was found to decrease with increase in rGO content, while the optical gap Eop 2 was found to increase with increase in rGO content. The carrier's concentrations as well as the effective mass were calculated assuming hydrogen-like model. The good absorption in the UV region of rGO x V 2 O 5 •nH 2 O films are promising candidate for solar cell photostabilizer applications. Keywords Vanadium pentoxide • Reduced graphene oxide • Sol-gel thin nanocrystalline filmsThis article is part of the Topical Collection on Advanced Photonics Meets Machine Learning. Guest edited by Goran Gligoric, Jelena Radovanovic and Aleksandra Maluckov.

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“…9(a, b). These spectral distribution curves have been used to compute the refractive index, (n), according to the following equation [23] R=…”

Section: Curves Of Refractive Index and Extinction Coefficient Disper...mentioning

confidence: 99%

Physical, Optical And Radiation Shielding Properties Of Some Phosphate Glasses

et al. 2021

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Glass systems xPbO-(50-x)ZnO-50(P2O5) (where x = 0,10,20,30,40,50 mol%) were made using the traditional melt quench method. The produced samples' amorphous phase was confirmed by x-ray diffraction (XRD). The effect of replacing Zn 2+ with Pb 2+ ions on the chemical structure of the studied system was investigated using Fouriertransform infrared (FTIR) in the range 400-4000 cm -1 . Moreover, the optical constants such as refractive index, absorption coefficient, extinction coefficient, optical band gap, and optical conductivity have been calculated using UV-Visible spectroscopy. Density, Molar volume, and hardness were measured, and they are found to be composition-dependent. 60 Co (6.95µci) and 137 Cs (10µci) radioactive sources were used to investigate the attenuation of gamma rays through the samples. The basic shielding quantities for determining the penetration of radiation in glass, such as mass attenuation coefficient (μ/ρ) and half value layer (HVL) were investigated experimentally and theoretically. The results proved that the prepared glass samples possess superior gamma-ray shielding effectiveness.

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

Cited by 12 publications

References 23 publications

Cut-and-stack nanofiber paper toward fast transient energy storage

Cut-and-stack nanofiber paper toward fast transient energy storage

Characterization and optical properties of reduced graphene oxide doped nano-crystalline vanadium pentoxide

Physical, Optical And Radiation Shielding Properties Of Some Phosphate Glasses

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