SiO2/Ta2O5 core-shell nanowires and nanotubes

(Figure Presented) Tantalizing silica: SiO2/Ta2O 5 core-shell nanostructures were formed by reducing SiO2 nanowires under a Ta atmosphere at 950°C. The diameter of the SiO 2 nanowires inside the core-shell nanostructures could be manipulated by modifying the reduction time. Treatment of the core-shell structures in dilute HF solution yielded Ta2O5 nanotubes (see TEM image), whereas Ta2O5 nanowires were formed directly by increasing the reduction time. © 2006 Wiley-VCH Verlag GmbH & Co. KGaA.