Six‐fold rotationally symmetric vanadium oxide nanostructures by a morphotropic phase transition

O’Dwyer, Colm; Lavayen, Vladimir; Fuenzalida, David; Newcomb, S. B.; Ana, M. A. Santa; Benavente, E.; González, Guillermo; Torres, C. M. Sotomayor

doi:10.1002/pssb.200776123

Cited by 11 publications

(3 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Each nanostructure is made of six spoke-like V 6 O 11 platelets making an angle of about 60°. Their formation from the layered xerogel is explained via a morphotropic transition [ 124 ].…”

Section: Nanostructured Vanadium Oxidesmentioning

confidence: 99%

Hydrothermal Synthesis of Nanostructured Vanadium Oxides

2010

View full text Add to dashboard Cite

A wide range of vanadium oxides have been obtained via the hydrothermal treatment of aqueous V(V) solutions. They exhibit a large variety of nanostructures ranging from molecular clusters to 1D and 2D layered compounds. Nanotubes are obtained via a self-rolling process while amazing morphologies such as nano-spheres, nano-flowers and even nano-urchins are formed via the self-assembling of nano-particles. This paper provides some correlation between the molecular structure of precursors in the solution and the nanostructure of the solid phases obtained by hydrothermal treatment.

show abstract

“…Each nanostructure is made of six spoke-like V 6 O 11 platelets making an angle of about 60°. Their formation from the layered xerogel is explained via a morphotropic transition [ 124 ].…”

Section: Nanostructured Vanadium Oxidesmentioning

confidence: 99%

Hydrothermal Synthesis of Nanostructured Vanadium Oxides

2010

View full text Add to dashboard Cite

show abstract

“…Once thiols formed the layered nanocomposite with xerogel, the compound is submitted to hydrothermal treatment at 180 °C during seven days. This process induces six folds symmetric cogs [ 61 ] and the star fruit morphology [ 62 ] (see Figure 4 ).…”

Section: Synthesis Of Vanadium Oxidesmentioning

confidence: 99%

Review on Sol-Gel Synthesis of Perovskite and Oxide Nanomaterials

Navas

Fuentes

Castro‐Alvarez

et al. 2021

Gels

120

View full text Add to dashboard Cite

Sol-Gel is a low cost, well-established and flexible synthetic route to produce a wide range of micro- and nanostructures. Small variations in pH, temperature, precursors, time, pressure, atmosphere, among others, can lead to a wide family of compounds that share the same molecular structures. In this work, we present a general review of the synthesis of LaMnO3, SrTiO3, BaTiO3 perovskites and zinc vanadium oxides nanostructures based on Sol-Gel method. We discuss how small changes in the parameters of the synthesis can modify the morphology, shape, size, homogeneity, aggregation, among others, of the products. We also discuss the different precursors, solvents, working temperature, reaction times used throughout the synthesis. In the last section, we present novel uses of Sol-Gel with organic materials with emphasis on carbon-based compounds. All with a perspective to improve the method for future applications in different technological fields.

show abstract

“…As nanostructured materials, such as nanotubes, nanorods, and nanowires [18,19], which often exhibit unique physical and chemical properties that differ from their bulk materials, nanostructured vanadium oxides have attracted particular attention, and methods have been developed to synthesize nanostructured vanadium oxides, such as the solution method [20][21][22], sol-gel method [17,23,24], sol electrochemical deposition [13,14], thermal vapor transport method [25], etc.…”

mentioning

confidence: 99%

Oxidation phase growth diagram of vanadium oxides film fabricated by rapid thermal annealing

Tamura

Wang

et al. 2009

Front. Mater. Sci. China

View full text Add to dashboard Cite

Thermal evaporation deposited vanadium oxide films were annealed in air by rapid thermal annealing (RTP). By adjusting the annealing temperature and time, a series of vanadium oxide films with various oxidation phases and surface morphologies were fabricated, and an oxidation phase growth diagram was established. It was observed that different oxidation phases appear at a limited and continuous annealing condition range, and the morphologic changes are related to the oxidation process.Keywords vanadium oxides (VO x ), rapid thermal annealing (RTA), phase growth diagram Vanadium oxides are widely studied nowadays due to their interesting properties such as in catalysis [1], chemical sensing [2,3], photoluminescence [4], thermochromism [5,6], metal-insulator transition [7-10], etc. Because of these various properties, vanadium oxides are expected to have applications in optical-electrical switches [9,10], temperature and gas sensors [2,3,11], cathode materials for advanced lithium batteries [12-15], electrochromic devices [13,16,17], etc. As nanostructured materials, such as nanotubes, nanorods, and nanowires [18,19], which often exhibit unique physical and chemical properties that differ from their bulk materials, nanostructured vanadium oxides have attracted particular attention, and methods have been developed to synthesize nanostructured vanadium oxides, such as the solution method [20-22], sol-gel method [17,23,24], sol electrochemical deposition [13,14], thermal vapor transport method [25], etc.Vanadium oxides contain many oxidation phases, such as VO, V 2 O 3 , VO 2 , V 6 O 13 , and V 2 O 5 . In most of the works mentioned above, the studies mainly focused on only one or two oxidation phases individually, and it was necessary to have more overall studies of these oxidation phases, e.g., the process, phenomenon, and rule of phase transition among these oxidation phases.In this letter, we report on the oxidation phase transitions among vanadium oxide (VO x ) nano films during rapid thermal annealing (RTP), and an oxidation phase growth diagram that gave the relationship between fabrication conditions and oxidation phases was established. Moreover, surface morphology changes during the oxidation phase transition were observed.Vanadium oxide film was as-deposited by thermal evaporation deposition method on a Si (100) substrate. The substrate was ultrasonically cleaned with acetone, ethanol and de-ionized water for 10 min in sequence respectively, and placed 20 mm below a pure vanadium piece (purity 99.99%, size 5 mm Â 50 mm Â 0.7 mm) whose ends were connected to two copper electrodes, respectively. When the vacuum level of the chamber reached 5Â10 -2 Torr (&6.67 Pa), a voltage of 1.5 V was applied to the two electrodes, and the current through the piece was examined to be 85 A. The vanadium sheet was thus heated up and evaporated rapidly in the rough vacuum, and after 15 min, a layer of vanadium oxide film was deposited on the silicon substrate. Then, the asdeposited sample was cut into pieces and annealed in ai...

show abstract

Six‐fold rotationally symmetric vanadium oxide nanostructures by a morphotropic phase transition

Cited by 11 publications

References 12 publications

Hydrothermal Synthesis of Nanostructured Vanadium Oxides

Hydrothermal Synthesis of Nanostructured Vanadium Oxides

Review on Sol-Gel Synthesis of Perovskite and Oxide Nanomaterials

Oxidation phase growth diagram of vanadium oxides film fabricated by rapid thermal annealing

Contact Info

Product

Resources

About