Open Access

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 Research Letters20062:17

DOI: 10.1007/s11671-006-9023-7

Received: 8 August 2006

Accepted: 16 September 2006

Published: 27 October 2006

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.

Keywords

Niobia Nanoparticles Core-shell structure Diffused reflection spectroscopy

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Declarations

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.

Authors’ Affiliations

(1)
Department of Chemistry and Kanbar Laboratory for Nanomaterials, Bar-Ilan University Center for Advanced Materials & Nanotechnology, Bar-Ilan University

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© to the authors 2006