Preparation of vanadium pentoxide powders by microwave plasma-torch at atmospheric pressure

Shin, Dong Hun; Bang, Chan Uk; Hong, Yong Cheol; Uhm, Han S.

doi:10.1016/j.matchemphys.2005.10.026

Cited by 25 publications

(11 citation statements)

References 29 publications

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“…Plasma torches and micro-torches are used principally to grow nanoparticles. They can be excited by microwave power supplies (figure 4a) [81][82][83][84][85][86][87][88] or by dc generators (figure 4b and 4c) [89][90][91][92][93][94]. Cathodic arc is mostly employed for powder synthesis whereas anodic arc is employed for synthesis of carbon nanostructures [92][93][94][95][96], with a few exceptions [97].…”

Section: Plasma Torchesmentioning

confidence: 99%

Nanoscience with non-equilibrium plasmas at atmospheric pressure

Belmonte¹,

Arnoult²,

Henrion³

et al. 2011

J. Phys. D: Appl. Phys.

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This review devoted to nanoscience with atmospheric pressure plasmas shows how nanomaterials are synthesised locally using three main ways: localized PECVD, nanoparticles and templates. On the other hand, self-organization of nano-objects on surfaces is driven by electric fields, stress and high temperatures. We show that the specificities of plasmas at high pressure, as their small size, their self-organization or their filamentation have been little exploited in the synthesis of nanomaterials. Finally, perspectives in the field are given.

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Section: Plasma Torchesmentioning

confidence: 99%

Nanoscience with non-equilibrium plasmas at atmospheric pressure

Belmonte¹,

Arnoult²,

Henrion³

et al. 2011

J. Phys. D: Appl. Phys.

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“…V 2 O 5 powders can be obtained by various physical and chemical methods, such as CVD, [2][3][4] hydrothermal method, [1,3,5] spray pyrolysis, [6] sol-gel, [7][8][9] co-precipitation, [10] and microwave plasma-torch method, [11] etc. Chemical vapor synthesis, also known as CVD or chemical vapor condensation (CVC), [12][13][14] is an alternative method for the direct synthesis of nanoparticles.…”

mentioning

confidence: 75%

Chemical Vapor Synthesis and Physico‐chemical Properties of V₂O₅ Nanoparticles

Chin

Park

et al. 2012

Chemical Vapor Deposition

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In the field of heterogeneous catalysts, nanometer-size transition metal oxides are of great interest. In particular, vanadium oxide-based materials, including vanadium pentoxide (V 2 O 5 ) and vanadium phosphates, are catalysts for the mild oxidation of hydrocarbons and alcohols.[1] To date, V 2 O 5 has attracted increasing interest for its potential applications as catalysts, sensors, and electrodes. V 2 O 5 powders can be obtained by various physical and chemical methods, such as CVD, [2][3][4] hydrothermal method, [1,3,5] spray pyrolysis, [6] sol-gel, [7][8][9] co-precipitation, [10] and microwave plasma-torch method, [11] etc. Chemical vapor synthesis, also known as CVD or chemical vapor condensation (CVC), [12][13][14] is an alternative method for the direct synthesis of nanoparticles. The principle advantages of the reactions in the gas phase are, very short process times, and nanometer-scale powders of high purity with a narrow particle size distribution. The particle morphology, crystalline phase, and surface chemistry of thermally decomposed particles can be controlled by regulating the precursor composition, reaction temperature, pressure, solvent property, and aging time. [15,16] In a typical CVC process, the precursor solution is atomized into an aerosol reactor (electric furnace) where droplets undergo solvent evaporation and solute precipitation within the droplets, which are then dried. In a typical thermal decomposition process, the precursor solution was atomized into an aerosol reactor, where droplets underwent solvent evaporation and solute precipitation within the droplets, which were then dried, followed by thermolysis of the precipitates at higher temperatures, and finally sintering to form the final particles.[15]In the CVC process, the synthesis temperature is one of the most important factors for determining the particle morphology, such as the crystal phase, size, specific surface area, surface composition, and chemical state. [15,17] In this study, V 2 O 5 nanoparticles were obtained by the thermal decomposition of a vanadium oxytriethoxide (VOTE) solution. The detailed microstructural characteristics of the thermally decomposed nanoparticles were examined as a function of the synthesis temperatures (500-1300 8C). Figure 1a shows X-ray diffraction (XRD) patterns of the V 2 O 5 nanoparticles prepared at each synthesis temperature. The XRD patterns of the V 2 O 5 samples synthesized at 900, 1100, and 1300 8C showed similar patterns with different peak intensities, and indicated a single-Shcherbinaite phase with an orthorhombic structure (JCPDS Card No. 41-1426) and lattice parameters of a ¼ 1.1516 nm, b ¼ 0.332 nm, and c ¼ 0.43727 nm. [8,10] In addition, the peak intensities of the V 2 O 5 samples increased with increasing synthesis temperature to 900 and 1300 8C, indicating enhanced crystallization. The peaks (001) intensity became higher and the peak shape narrower, indicating an increase in V 2 O 5 crystallite or grain size, which was calculated from the line broadening of (001) dif...

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“…The VN nanopower with the average size of ~30 nm was synthesized by injecting VCl 4 aerosol bubbled by argon gas into a microwave plasma reactor at atmospheric pressure. The synthesis method and procedure were reported in our previous article [13,14]. In a typical synthesis of the organic-inorganic solid foam, 2.8 g of C 16 H 33 NH 2 was dissolved in 4.2 ml acetone and 0.5 g (or 7.7 × 10 −3 mol) of VN nanopowder was added to the mixture.…”

Section: Methodsmentioning

confidence: 99%

A Crystalline Material Made from Oxidation of Vanadium Nitride via Foam Route

Hong¹,

Uhm²

2013

SNL

Self Cite

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Facile method of synthesizing organic-inorganic solid foam in complex structure is presented. The synthesis method is based on the use of neutral surfactant (1-hexadecylamine, C 16 H 33 NH 2) as structure directing agent and inorganic salt (vanadium nitride, VN) as precursor. The foam containing C 16 H 33 NH 2 has been synthesized by evolution of oxygen gas produced spontaneously from hydrogen peroxide through a viscous VN gel. The foam from the precursor of 0.5 g VN nanopowder grows gradually, reaching about 0.3 liters 10 minutes after excess addition of H 2 O 2 and stirring. The ultralight, crystalline material made via foam processing was observed by XRD, SEM, TEM, and FTIR.

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Preparation of vanadium pentoxide powders by microwave plasma-torch at atmospheric pressure

Cited by 25 publications

References 29 publications

Nanoscience with non-equilibrium plasmas at atmospheric pressure

Nanoscience with non-equilibrium plasmas at atmospheric pressure

Chemical Vapor Synthesis and Physico‐chemical Properties of V₂O₅ Nanoparticles

A Crystalline Material Made from Oxidation of Vanadium Nitride via Foam Route

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Preparation of vanadium pentoxide powders by microwave plasma-torch at atmospheric pressure

Cited by 25 publications

References 29 publications

Nanoscience with non-equilibrium plasmas at atmospheric pressure

Nanoscience with non-equilibrium plasmas at atmospheric pressure

Chemical Vapor Synthesis and Physico‐chemical Properties of V2O5 Nanoparticles

A Crystalline Material Made from Oxidation of Vanadium Nitride via Foam Route

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Chemical Vapor Synthesis and Physico‐chemical Properties of V₂O₅ Nanoparticles