Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.3642979
Title: Nitrogen-doped rice grain-shaped titanium dioxide nanostructures by electrospinning: Frequency and temperature dependent conductivity
Authors: Babu, V.J. 
Rao, R.P. 
Nair, A.S. 
Ramakrishna, S. 
Issue Date: 15-Sep-2011
Citation: Babu, V.J., Rao, R.P., Nair, A.S., Ramakrishna, S. (2011-09-15). Nitrogen-doped rice grain-shaped titanium dioxide nanostructures by electrospinning: Frequency and temperature dependent conductivity. Journal of Applied Physics 110 (6) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.3642979
Abstract: Rice grain-shaped, nitrogen-doped titanium dioxide (N-TiO2) nanostructures are synthesized using sol-gel method and followed by electrospinning. The as-spun composite fibers are sintered at 500°C for 1 h in air. SEM images of the sintered samples showed rice grain-shaped nanostructures. The nanostructures were made up of spherical nanoparticles with average diameters of ∼ 20 nm, and the average diameter decreased with increase of N doping level. The temperature and frequency dependent electrical characterization has carried on nanostructures using impedance spectroscopy in the range of 298 K to 498 K and 30 Hz to 7 MHz, respectively. The magnitude of the ac conductivity is obtained from Nyquist plots and is proved that the ac conductivity is strongly dependent on temperature. The activation energy (E a) is obtained from Arrhenius plots, and it is lowered from 0.31 to 0.22 eV with increasing N content. Therefore, the rice-grain shaped nanostructures can be employed in the low temperature gas sensor applications. © 2011 American Institute of Physics.
Source Title: Journal of Applied Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/85485
ISSN: 00218979
DOI: 10.1063/1.3642979
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