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Facile synthesis of ultrafine TiO2 nanowires with large aspect ratio and its photoactivity

Publication Type : Journal Article

Thematic Areas : Nanosciences and Molecular Medicine

Publisher : International Journal of Materials Research

Source : International Journal of Materials Research, Volume 104, Number 6, p.573-577 (2013)

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Keywords : Aspect ratio, Facile synthesis, High resolution transmission electron microscopy, Hydrothermal methods, Large aspect ratio, Lifetime measurements, Morphological analysis, Nanoparticles, Nanowires, Optical band gaps, Photoelectrons, Radical formation, Recombination time, scanning electron microscopy, TiO, Titanium dioxide, X ray photoelectron spectroscopy

Campus : Kochi

School : Center for Nanosciences

Center : Nanosciences

Department : Nanosciences and Molecular Medicine

Year : 2013

Abstract : In the present study, ultrafine TiO2 nanowires (-80 nm in diameter) exhibiting large aspect ratio in the order of 103 were synthesized hydrothermally. Phase and morphological analysis of the nanowires was carried out using X-ray dif- fractometry, X-ray photoelectron spectroscopy and scanning electron microscopy. High resolution transmission electron microscopy revealed the wire exhibiting growth in (101). A Tauc plot derived from UV analysis showed the average band gap values for nanowires to be less than for nanoparticles of similar diameter. It was observed that nanowires exhibited a high degree of photoactivity in an eo- sin-based dye system which was found to be 20-30% more than that of nanoparticles. This high photoactivity in nanowires was attributed to the longer charge retention which was observed during lifetime measurements, resulting in easy radical formation and dye degradation. Lifetime measurements on the nanowires showed the recombination time to be 54 ns as compared to 43 ns for nanoparticles.

Cite this Research Publication : G. S. Anjusree, Asha, A. M., Subramanian, K. R. V., Sivakumar, N., A. S. Nair, Nair, S. V., and Balakrishnan, A., “Facile synthesis of ultrafine TiO2 nanowires with large aspect ratio and its photoactivity”, International Journal of Materials Research, vol. 104, pp. 573-577, 2013.

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