Thermal decomposition of vanadyl acetylacetonate

Nenashev, R. N.; Mordvinova, Natalia E.; Зломанов, В. П.; Кузнецов, В. Л.

doi:10.1134/s0020168515090150

Cited by 21 publications

(16 citation statements)

References 18 publications

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“…At the decomposing stage, the carbon contained chelate rings detach from the molecule and further decompose to form carbon. Subsequently, oxygen oxidized VO to form crystalline VO 2 and some carbon from precursor remained in the composite . At the low oxygen flow rate range, the VO 2 shows a very low crystallinity or even being amorphous.…”

Section: Resultsmentioning

confidence: 99%

Largely Lowered Transition Temperature of a VO₂/Carbon Hybrid Phase Change Material with High Thermal Emissivity Switching Ability and Near Infrared Regulations

Wang

Liu

et al. 2018

Adv Materials Inter

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Vanadium oxide (VO2) as a phase changing material possesses abrupt infrared (IR) transmission and thermal emissivity changing during the metal–insulator transition across transition temperature (τc) of 68 °C. However, the high τc, moderate IR transmission and emissivity regulating ability limits its applications in various fields. A VO2/carbon hybrid phase change material fabricated via homemade plasma enhanced chemical vapor deposition is reported. The material shows a best reported thermal emissivity contrast (0.44) among the experimental values, a largely lowered τc (45 °C), promising a near IR‐regulation ability with enhanced photothermal effect in smart windows applications. The theoretical calculation results proved that the improvement of emissivity contrast is due to the hybridization of carbon. This work provides a new approach to synthesize VO2 hybrid materials, which have wide applications in camouflage, sensing, and smart windows.

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Section: Resultsmentioning

confidence: 99%

Largely Lowered Transition Temperature of a VO₂/Carbon Hybrid Phase Change Material with High Thermal Emissivity Switching Ability and Near Infrared Regulations

Wang

Liu

et al. 2018

Adv Materials Inter

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“…Interestingly, 1 minute after the injection of DDT and OLAM in the reaction mixture, XRD highlights the presence of covellite CuS and chalcocite Cu2S together with other small peaks which can be assigned to the VO(acac)2 or its decomposition products. [38][39][40] Two different morphologies (nanospheres and nanoplatelets) of CuxS nanoparticles are observed in TEM and, based on a size selective precipitation, the nanospheres can be assigned to chalcocite Cu2S and the nanoplatelets to covellite CuS. After 5 minutes the cubic Cu3VS4 phase appears in the XRD pattern and concomitantly a few nanocubes are observed in the corresponding TEM image.…”

Section: Study Of the Cu3vs4 Ncs Growth Mechanismmentioning

confidence: 95%

Synthesis and Size-Dependent Optical Properties of Intermediate Band Gap Cu₃VS₄ Nanocrystals

et al. 2018

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Intermediate band gap semiconductors are an underexplored class of materials with unique optical properties of interest for photovoltaic and optoelectronic applications. Herein, we synthesize highly crystalline cubic Cu3VS4 nanocrystals with tunable edge length of 9 nm, 12 nm and 18 nm. Since size-control is achieved for the first time for this semiconductor, particular emphasis is dedicated to the structural/compositional analysis, the formation mechanism and the size-dependent optical properties. The corresponding UV-Vis spectra reveal three absorption peaks in the visible range, resulting from the intermediate band gap electronic structure of Cu3VS4, which blue-shift with decreasing size. Density functional theory reveals these size-dependent optoelectronic properties to result mostly from weak quantum confinement. The reported results pave the way towards further fundamental investigations of the physicochemical properties of intermediate band gap semiconductors in the nanoscale regime for solar energy harvesting.

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“…The relatively high solubility in non-aqueous solvent was the main requirement, since the chemical resistance of barium cerate towards water is significantly small. The vanadyl acetylacetonate was chosen as the V 2 O 5 precursor since it decomposes in air at relatively low temperature (about 400°C) with formation of vanadium(V) oxide [20,21]. Methanol was used as a solvent since it allowed a solution with relatively high concentration (0.35 M) to be obtained.…”

Section: Sample Preparationmentioning

confidence: 99%

Structure, chemical stability and electrical properties of BaCe0.9Y0.1O3−δ modified with V2O5

Łącz

2019

J Therm Anal Calorim

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Wet vacuum impregnation method was applied in order to evaluate the possibility of the formation of the material in BaCe 0.9 Y 0.1 O 3-d -V 2 O 5 system. Single-phase BaCe 0.9 Y 0.1 O 3-d samples, synthesised by solid-state reaction method, were impregnated with the solution of vanadium(V) oxide precursor. Multi-step, multi-cycle impregnation procedure was applied to enhance the impregnation efficiency. Partial decomposition of Y-doped BaCeO 3 in contact with the solution of the precursor, resulting in the formation of vanadium containing phases (CeVO 4 and BaV 2 O 6 ) on the materials surface, was observed. However, the presence of vanadium was also confirmed for the inner parts of the materials. The synthesised materials were submitted for exposition test to evaluate their chemical stability towards CO 2 /H 2 O. All BaCe 0.9 Y 0.1 O 3based materials modified by impregnation revealed higher chemical stability in comparison with single-phase un-modified BaCe 0.9 Y 0.1 O 3-d , since the amount of barium carbonate formed during the exposition was significantly lower. The total electrical conductivity of the received multi-phase materials was generally slightly lower than for the reference BaCe 0.9 Y 0.1 O 3-d sample, since the presence of the additional phases had a blocking effect on materials conductivity. The values of BaCeO 3 lattice parameters and the Seebeck coefficient did not show the modification of the defects structure of Y-doped BaCeO 3 during applied synthesis procedure.

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Thermal decomposition of vanadyl acetylacetonate

Cited by 21 publications

References 18 publications

Largely Lowered Transition Temperature of a VO₂/Carbon Hybrid Phase Change Material with High Thermal Emissivity Switching Ability and Near Infrared Regulations

Largely Lowered Transition Temperature of a VO₂/Carbon Hybrid Phase Change Material with High Thermal Emissivity Switching Ability and Near Infrared Regulations

Synthesis and Size-Dependent Optical Properties of Intermediate Band Gap Cu₃VS₄ Nanocrystals

Structure, chemical stability and electrical properties of BaCe0.9Y0.1O3−δ modified with V2O5

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Thermal decomposition of vanadyl acetylacetonate

Cited by 21 publications

References 18 publications

Largely Lowered Transition Temperature of a VO2/Carbon Hybrid Phase Change Material with High Thermal Emissivity Switching Ability and Near Infrared Regulations

Largely Lowered Transition Temperature of a VO2/Carbon Hybrid Phase Change Material with High Thermal Emissivity Switching Ability and Near Infrared Regulations

Synthesis and Size-Dependent Optical Properties of Intermediate Band Gap Cu3VS4 Nanocrystals

Structure, chemical stability and electrical properties of BaCe0.9Y0.1O3−δ modified with V2O5

Contact Info

Product

Resources

About

Largely Lowered Transition Temperature of a VO₂/Carbon Hybrid Phase Change Material with High Thermal Emissivity Switching Ability and Near Infrared Regulations

Largely Lowered Transition Temperature of a VO₂/Carbon Hybrid Phase Change Material with High Thermal Emissivity Switching Ability and Near Infrared Regulations

Synthesis and Size-Dependent Optical Properties of Intermediate Band Gap Cu₃VS₄ Nanocrystals