Journal
INORGANIC CHEMISTRY FRONTIERS
Volume 3, Issue 8, Pages 1035-1042Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6qi00102e
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Funding
- National Natural Science Foundation of China [51325203]
- Ministry of Science and Technology of China [2014AA032802]
- Science and Technology Commission of Shanghai Municipality [15XD1501700, 13521102100]
- Materials Genome Institute of Shanghai University [14DZ2261200]
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VO2(M) nanostructures of various shapes were synthesized by a hydrothermal-calcination method. First, VO2(D) nanoparticles were synthesized by the surfactant-free hydrothermal reduction of ammonium metavanadate by oxalic acid at 160-220 degrees C. Then, the produced VO2(D) was further calcined at 250-600 degrees C to obtain the VO2(M) nanoparticles. To understand the hydrothermal reduction processes, both in situ powder X-ray diffraction (PXRD) and ex situ characterization were carried out. The results indicate a sequential process starting from the reduction of ammonium metavanadate and nucleation of the vanadium precursor, followed by the formation of intermediate VO2(B) nanosheets or nanorods, and finally phase transformation from VO2(B) to VO2(D) with a variety of morphologies. A crystal growth mechanism based on self-assembly and Ostwald ripening was proposed to explain the formation process of these unique nanostructures. The as-prepared VO2(M) nanoaggregates exhibited a lower thermochromic phase transition temperature (41.0 degrees C) and a narrower thermal hysteresis width (6.6 degrees C) than those nanopowders prepared by other methods.
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