Preparation of W- and Mo-doped VO2(M) by ethanol reduction of peroxovanadium complexes and their phase transition and optical switching properties

2016

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Vanadium dioxide VO 2 has been paid in recent years increasing attention because of its various applications, however, its oxidation resistance properties in air atmosphere have rarely been reported. Herein, VO 2 (B) nanobelts were transformed into VO 2 (A) and VO 2 (M) nanobelts by hydrothermal route and calcination treatment, respectively. Then, we comparatively studied the oxidation resistance properties of VO 2 (B), VO 2 (A) and VO 2 (M) nanobelts in air atmosphere by thermo-gravimetric analysis and differential thermal analysis (TGA/DTA). It was found that the nanobelts had good thermal stability and oxidation resistance below 341°C, 408°C and 465°C in air, respectively, indicating that they were stable in air at room temperature. The fierce oxidation of the nanobelts occurred at 426, 507 and 645°C, respectively. The results showed that the VO 2 (M) nanobelts had the best thermal stability and oxidation resistance among the others. Furthermore, the phase transition temperatures and optical switching properties of VO 2 (A) and VO 2 (M) were studied by differential scanning calorimetry (DSC) and variabletemperature infrared spectra. It was found that the VO 2 (A) and VO 2 (M) nanobelts had outstanding thermochromic character and optical switching properties.

Section: Synthesis Of Vo 2 (B) Nanobeltsmentioning

confidence: 99%

VO₂(B) conversion to VO₂(A) and VO₂(M) and their oxidation resistance and optical switching properties

2016

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“…Besides, VO 2 (B) is usually used as a precursor to be transformed to other vanadium oxides by hydrothermal or thermal treatment [26][27][28]. However, to the best of our knowledge, there is no report on the investigations of the influence of VO 2 (B) on the thermal decomposition of AP.…”

Section: Introductionmentioning

confidence: 99%

The influence of VO₂(B) nanobelts on thermal decomposition of ammonium perchlorate

Tan

Meng

2015

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The influence of vanadium dioxide VO 2 (B) on thermal decomposition of ammonium perchlorate (AP) has not been reported before. In this contribution, the effect of VO 2 (B) nanobelts on the thermal decomposition of AP was investigated by the ThermoGravimetric Analysis and Differential Thermal Analysis (TG/DTA). VO 2 (B) nanobelts were hydrothermally prepared using peroxovanadium (V) complexes, ethanol and water as starting materials. The thermal decomposition temperatures of AP in the presence of 1 wt.%, 3 wt.% and 6 wt.% of as-obtained VO 2 (B) nanobelts were reduced by 39°C, 62°C and 74°C, respectively. The results indicated that VO 2 (B) nanobelts had a great influence on the thermal decomposition temperature of AP. Furthermore, the influence of the corresponding V 2 O 5 , which was obtained by thermal treatment of VO 2 (B) nanobelts, on the thermal decomposition of AP was also investigated. The results showed that VO 2 (B) nanobelts had a greater influence on the thermal decomposition temperature of AP than that of V 2 O 5 .

“…In recent years, vanadium oxides and their derived compounds have attracted increasing attention as the functional materials because of their layered structures and specific chemical and physical properties, which make them attractive for a wide range of practical and potential applications, such as catalysts, cathode materials for reversible lithium-ion batteries, gas sensors, intelligent thermochromic windows, optical switching devices, laser shield, optical or electrical modulators and so on [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The family of vanadium oxides, V 2 O 3 exhibits a metal-to-insulator transition (MIT) as a function of temperature, doping concentration or pressure [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of V2O3/C composites with different morphologies by a facile route and phase transition properties of the compounds

Wang

Huang

et al. 2014

Self Cite

V 2 O 3 and amorphous carbon composites (V 2 O 3 /C composites) with different morphologies (e.g. nanospheres, nanorods and nanosheets) were, for the first time, successfully synthesized by a facile hydrothermal route and subsequent calcination. The as-obtained samples were characterized by X-ray powder diffraction (XRD), energy dispersive spectrometery (EDS), elemental analysis (EA), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The morphology of V 2 O 3 /C composites could be easily controlled by varying the reaction time, and, as a result, V 2 O 3 /C composites with nanospheres, nanorods and nanosheets were selectively synthesized. Furthermore, the phase transition property of V 2 O 3 /C composites was measured by differential scanning calorimetry (DSC), suggesting that V 2 O 3 /C composites exhibit the phase transition similar to V 2 O 3 , which could expand the potential applications of materials related to V 2 O 3 in the future.