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Synthesis and characterization of Nb2O5@C core-shell nanorods and Nb2O5nanorods by reacting Nb(OEt)5via RAPET (reaction under autogenic pressure at elevated temperatures) technique

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Abstract

The reaction of pentaethoxy niobate, Nb(OEt)5, at elevated temperature (800 °C) under autogenic pressure provides a chemical route to niobium oxide nanorods coated with amorphous carbon. This synthetic approach yielded nanocrystalline particles of Nb2O5@C. As prepared Nb2O5@C core-shell nanorods is annealed under air at 500 °C for 3 h (removing the carbon coating) results in neat Nb2O5nanorods. According to the TEM measurements, the Nb2O5crystals exhibit particle sizes between 25 nm and 100 nm, and the Nb2O5crystals display rod-like shapes without any indication of an amorphous character. The optical band gap of the Nb2O5nanorods was determined by diffuse reflectance spectroscopy (DRS) and was found to be 3.8 eV.

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Acknowledgements

P. P. George thanks the Bar-Ilan Research authority for a post-doctoral fellowship. We are also thankful to Ms. Louise Braverman for editorial assistance. Technical support from Dr. Yuri Koltypin is gratefully acknowledged.

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Correspondence to A. Gedanken.

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George, P.P., Pol, V.G. & Gedanken, A. Synthesis and characterization of Nb2O5@C core-shell nanorods and Nb2O5nanorods by reacting Nb(OEt)5via RAPET (reaction under autogenic pressure at elevated temperatures) technique. Nanoscale Res Lett 2, 17 (2007) doi:10.1007/s11671-006-9023-7

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Keywords

  • Niobia
  • Nanoparticles
  • Core-shell structure
  • Diffused reflection spectroscopy