Controlled Reduction of Vanadium Oxide Nanoscrolls: Crystal Structure, Morphology, and Electrical Properties
| Autor: | Ram Seshadri, Anthony K. Cheetham, Madeleine Grossman, Kevin Ray Heier, Serena A. Corr, Brent C. Melot, Joshua D. Furman |
|---|---|
| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Chemistry of Materials. 20:6396-6404 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/cm801539f |
| Popis: | The systematic and controlled reduction of vanadium oxide nanoscrolls results in routes to the large-scale preparation of nanostructures of the interesting and useful materials rutile VO2 and corundum V2O3. Vanadium oxide (V2O5−δ) nanoscrolls, prepared by the hydrothermal treatment of aged suspensions of V2O5 and dodecylamine, were reduced in a furnace in an atmosphere of 5% H2:95% N2 under different time and temperature conditions to monitor systematic trends in the structure and morphology of the resulting oxides. The products were characterized by X-ray diffraction (XRD), electron microscopy, N2 sorption measurements, and electrical transport studies. We find that the reduction conditions (time and temperature) play a significant role in determining the crystal structure and morphology of the products. At short times and low temperatures, the reduction products are rutile VO2. These convert to corundum V2O3 when temperatures are increased. In all cases, the appearance of crystalline Bragg peaks in XRD ... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|