On the complex refractive index of N-doped TiO 2 nanospheres and nanowires in the terahertz spectral region

On the complex refractive index of N-doped TiO 2 nanospheres and nanowires in the terahertz spectral region

In this paper, the terahertz (THz) transmission measurement technique was applied to characterize titanium dioxide (TiO 2 ) nanospheres and nanowires subjected to thermal treatments under various conditions. Differences in the spectral features of the nanospheres and nanowires were observed due to t...

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Bibliographic Details
Published in:Vibrational spectroscopy Vol. 68; p. 241
Main Authors: Bawuaha, Prince, Silfsten, Pertti, Sarkar, Anjana, Kordas, Kristian, Mikkola, Jyri-Pekka, Peiponen, Kai-Erik
Format: Journal Article
Language:English
Published: 2013
Subjects:
complex refractive index
Nanospheres
nanowires
photocatalysts
terahertz
titanium dioxide
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Summary:In this paper, the terahertz (THz) transmission measurement technique was applied to characterize titanium dioxide (TiO 2 ) nanospheres and nanowires subjected to thermal treatments under various conditions. Differences in the spectral features of the nanospheres and nanowires were observed due to treatment and annealing of the samples in different gas atmospheres. The observations made can be explained based on the formation of new phonon bands and/or widening of the phonon bands due to polymorphism. A singly subtractive Kramers Kronig dispersion relation was utilized to estimate the frequency-dependent real refractive index of the various samples, having a priori unknown sample thickness, from the absorbance data.
ISSN:1873-3697
0924-2031
DOI:10.1016/j.vibspec.2013.08.008