Combining Sol-Gel Chemistry and Extrusion Process Toward Generating First Vanadium Oxide Macroscopic Fibers

2005 ◽  
Vol 900 ◽  
Author(s):  
L. Biette ◽  
H. Serier ◽  
Florent Carn ◽  
Marie-France Achard ◽  
Nathalie Steunou ◽  
...  
Keyword(s):  
Vanadium Oxide ◽  
Sol Gel ◽  
Young Modulus ◽  
Extrusion Process ◽  
Main Axis ◽  
Preferential Orientation ◽  
High Scale ◽  
Polarized Microscopy ◽  
Textural Anisotropy

ABSTRACTUpon extrusion process, first vanadium oxide macroscopic fibers have been obtained. They are associated to longitudinal Young modulus from 15 to 25 GPa and depict strong high scale textural anisotropy as observed through cross-polarized microscopy. TEM observations and SAXS experiments reveal that those macroscopic fibers are made of nanoscopic ribbons associated to preferential orientation parallel to the macroscopic fiber main axis, while XRD and NMR investigations reveal a microstructure close to the V2O5.1.8H2O xerogels. These fibers can detect down to 0.1 ppm of ethanol within 16 seconds at 40°C.

Synthesis of Novel Vanadium Oxide Nanotubes and Nanofibers

2002 ◽  
Vol 740 ◽  
Author(s):  
Samuel T. Lutta ◽  
Hong Dong ◽  
Peter Y. Zavalij ◽  
M. Stanley Whittingham
Keyword(s):  
Thermal Analysis ◽  
Vanadium Oxide ◽  
Electrochemical Behavior ◽  
Redox Reactions ◽  
Sol Gel ◽  
Vanadium Oxides ◽  
Organic Polymer ◽  
Fibrous Morphology ◽  
Surfactant Templates ◽  
Vanadium Oxide Nanotubes

ABSTRACTWe are exploring the synthesis and properties of structured vanadium oxides mainly nanotubes and nanorods. Nanotubes initially formed with surfactant templates have been readily exchanged with simple cations without change of the basal-plane structure. These compounds contain d-like vanadium oxide layers with the vanadium in VO6 octahedra. This structure is particularly suitable for redox reactions. In this paper we report on synthesis of vanadium oxide, (NH4)xV2O5-d·nH2O rods using organic polymer as template. This compound has been synthesized by sol-gel reaction and subsequent hydrothermal treatment. TGA, SEM, XRD and FTIR were used to characterize this compound. Thermal analysis of this compound shows that the fibrous morphology is maintained when it is heated in nitrogen and oxygen above 300 °C. However, in both cases the size of the fibers decreases. Performance of this compound as cathode material in secondary electrolyte has been investigated using LiPF6 as electrolyte. A capacity of 140 mAh/g was obtained which remained fairly constant with up to at least 10 cycles. We also investigated electrochemical behavior of thermal products.

Characterization and Electrochemical Performances of Vanadium Oxide Films Doped with Metal Ions

2013 ◽  
Vol 537 ◽  
pp. 174-178
Author(s):  
Ji Chao Wang ◽  
Guang Ming Wu ◽  
Guo Hua Gao ◽  
Xiao Wei Zhou
Keyword(s):  
Metal Ions ◽  
Vanadium Oxide ◽  
Volume Fraction ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Electrochemical Techniques ◽  
Oxide Films ◽  
Dip Coating ◽  
Electrochemical Performances ◽  
Vanadium Oxide Films

Vanadium oxide films were prepared via the sol–gel process and dip coating method, using V2O5as raw materials and H2O2(volume fraction 30) as the solvent. Mn and Ni ions were added to vanadium oxide sol to prepare doping vanadium oxide films. The films were characterized by atomic force microscopy, FT-IR, X-ray diffraction and electrochemical techniques. The add-on of Metal ions will not affect the morphology of the vanadium oxide films, but change the valence of vanadium ion and vanadium oxide crystal phase. Furthermore, cyclic voltammetry curves show that metal ions doping vanadium oxide films exhibit reversible electrochemical reaction. But electrochemical impedance spectroscopy indicates pure vanadium oxide film has a better diffusion rate.

ChemInform Abstract: Sol-Gel Synthesis of Vanadium Oxide from Alkoxides.

ChemInform ◽  
2010 ◽  
Vol 22 (45) ◽  
pp. no-no
Author(s):  
M. NABAVI ◽  
C. SANCHEZ ◽  
J. LIVAGE
Keyword(s):  
Vanadium Oxide ◽  
Sol Gel ◽  
Sol Gel Synthesis

Multifunctional hybrid nanopapers based on bacterial cellulose and sol–gel synthesized titanium/vanadium oxide nanoparticles

Cellulose ◽  
2013 ◽  
Vol 20 (3) ◽  
pp. 1301-1311 ◽  
Author(s):  
Junkal Gutierrez ◽  
Susana C. M. Fernandes ◽  
Iñaki Mondragon ◽  
Agnieszka Tercjak
Keyword(s):  
Vanadium Oxide ◽  
Bacterial Cellulose ◽  
Sol Gel ◽  
Oxide Nanoparticles ◽  
Titanium Vanadium

X-Ray powder diffraction study of a new vanadium oxide Cr0.11V2O5.16 synthesized by a sol–gel process

1998 ◽  
Vol 8 (9) ◽  
pp. 2103-2108 ◽  
Author(s):  
Gilles Grégoire ◽  
Noël Baffier ◽  
Andrée Kahn-harari ◽  
Jean-claude Badot
Keyword(s):  
Vanadium Oxide ◽  
Diffraction Study ◽  
Powder Diffraction ◽  
Sol Gel ◽  
X Ray ◽  
Sol Gel Process

Sol-gel prepared vanadium oxide for photocatalytic degradation of Methylene Blue dye

2020 ◽  
Author(s):  
Bapuso M. Babar ◽  
Aniruddh A. Mohite ◽  
Vithoba L. Patil ◽  
Udayraj T. Pawar ◽  
Laxman D. Kadam ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Vanadium Oxide ◽  
Photocatalytic Degradation ◽  
Sol Gel ◽  
Blue Dye ◽  
Methylene Blue Dye

Thin Films of Nanocrystalline Vanadium Dioxide: Modification of the Properties, and Electrical Switching

2020 ◽  
Vol 854 ◽  
pp. 103-108
Author(s):  
A.L. Pergament ◽  
O.Ya. Berezina ◽  
S.V. Burdyukh ◽  
V.P. Zlomanov ◽  
Evgeniy A. Tutov
Keyword(s):  
Thin Films ◽  
Vanadium Oxide ◽  
Vanadium Dioxide ◽  
Sol Gel ◽  
Oxide Films ◽  
Threshold Value ◽  
Implantation Dose ◽  
Electrical Switching ◽  
Hydrogen Implantation ◽  
Vanadium Oxide Films

Vanadium oxide films have been fabricated by the acetylacetonate and triethoxy vanadyl sol-gel methods on silicon substrates, as well as by magnetron sputtering on glass-ceramic substrates. Additional annealing in reducing atmosphere results in formation of vanadium dioxide or mixed phases with a VO2 predominance. The obtained films demonstrate the metal-insulator transition and electrical switching. In the films produced from triethoxy vanadyl, the peculiarities of electrical properties are related to the size effect, heterophase character of vanadium oxide films, and different types of charge carriers in the bulk of nanocrystallites and on their surfaces. Also, the effect of doping with hydrogen by means of plasma-immersion ion implantation on the properties of vanadium dioxide is explored. It is shown that the transition parameters in VO2 thin films depend on the hydrogen implantation dose. At doses exceeding a certain threshold value, the films are metallized, and the phase transition no longer occurs.

STUDY OF THE ELECTRICAL PROPERTIES OF SOL-GEL-DERIVED TITANIUM-VANADIUM OXIDE FILMS

2002 ◽  
Vol 16 (28n29) ◽  
pp. 4465-4468 ◽  
Author(s):  
GAOLING ZHAO ◽  
GAORONG HAN
Keyword(s):  
Solid Solution ◽  
Electrical Properties ◽  
Vanadium Oxide ◽  
Hall Mobility ◽  
Sol Gel ◽  
Oxide Films ◽  
X Ray Diffraction ◽  
Type Semiconductor ◽  
Titanium Vanadium ◽  
Vanadium Oxide Films

Titanium-vanadium oxide films were prepared by the sol-gel method. The effects of vanadium incorporation on the crystallization behavior TiO 2 were investigated by X-ray diffraction analysis. The results showed that anatase and rutile type solid solution Ti 1-x V x O 2 films were obtained for x < 0.15 and x > 0.15 samples, respectively. Anatase and V 2 O 5 were found in x = 0.15 sample. Moreover, it was found that the crystallization of the film increased with increasing amount of vanadium. The electrical properties of Ti 1-x V x O 2 films were studied by measuring their resistance and Hall mobility. It was revealed that the resistivity of Ti 1-x V x O 2 films decreased with increasing x when the solid solution was formed, while the resistivity increased when the crystallization of vanadium oxide precipitated. The Hall constant was negative, indicating that Titanium-vanadium oxide is an n-type semiconductor. The evolution of the resistance and Hall mobility was ascribed to the 3d electrons of vanadium.

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