Unexpected phase transformation from VO2(R) to VO2(A) during hydrothermal treatment in the V2O5–H2C2O4–H2O system

Unexpected phase transformation from VO2(R) to VO2(A) during hydrothermal treatment in the... Vanadium dioxide (VO2) was directly synthesized via the reduction of V2O5 with oxalic acid adopting two different types of hydrothermal processes in the temperature ranging from 180 to 260 °C. The products were characterized by X-ray diffraction, field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). In all these processes, the VO2(B) phase was first formed at a relative lower temperature or the initial stage at higher temperature and then it transformed to the VO2(R) phase with the increase of temperature. The building-block-stacking mechanism was proposed to elucidate the transformation from VO2(B) nano-plates to snowflake-like VO2(R) powders. During this transformation, no trace of the VO2(A) phase was observed when one-step hydrothermal treatment method was used, whereas some part of the branches of the snowflake-like VO2(R) particles transformed to metastable VO2(A) nanofibers in the autoclave during cooling process when the two-step hydrothermal treatment method was conducted. The reason for this transformation can be contributed to the defects formed during the stacking process. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Unexpected phase transformation from VO2(R) to VO2(A) during hydrothermal treatment in the V2O5–H2C2O4–H2O system

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Publisher
Springer Netherlands
Copyright
Copyright © 2011 by Springer Science+Business Media B.V.
Subject
Chemistry; Inorganic Chemistry ; Catalysis; Physical Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-011-0290-2
Publisher site
See Article on Publisher Site

Abstract

Vanadium dioxide (VO2) was directly synthesized via the reduction of V2O5 with oxalic acid adopting two different types of hydrothermal processes in the temperature ranging from 180 to 260 °C. The products were characterized by X-ray diffraction, field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). In all these processes, the VO2(B) phase was first formed at a relative lower temperature or the initial stage at higher temperature and then it transformed to the VO2(R) phase with the increase of temperature. The building-block-stacking mechanism was proposed to elucidate the transformation from VO2(B) nano-plates to snowflake-like VO2(R) powders. During this transformation, no trace of the VO2(A) phase was observed when one-step hydrothermal treatment method was used, whereas some part of the branches of the snowflake-like VO2(R) particles transformed to metastable VO2(A) nanofibers in the autoclave during cooling process when the two-step hydrothermal treatment method was conducted. The reason for this transformation can be contributed to the defects formed during the stacking process.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Feb 3, 2011

References

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