(Color online) N-doped TiO2 at 5% (a) FE-SEM image of the rice grain-shaped TiO2. Inset shows as-spun nanofibers. (b) TEM image of N-TiO2 and inset shows a selected area electron diffraction (SEAD) pattern; (c) lattice-resolved image, which implies the existence of anatase phase at (101) plane; and (d) XRD pattern for the N-doped TiO2 for 0, and 5% (w/w). R and A denote the rutile and anatase phases, respectively and (e) the expanded region of the (101) peak for the anatase 101 shows no shift upon N-doping (0 and 5%).
(Color online) FT-IR spectra for the 0% of N-TiO2 and 5% of N-TiO2.
(Color online) (a) 0% of the N doped TiO2, N1s spectrum. Lorentzian curve fittings for 5% of N-dopings: (b) N1s, (c) Ti2p, and (d) O1s spectrum.
(Color online) Nyquist plot at various temperatures in the range of 298 K to 498 K (a) 0% of N in TiO2 and (b) 5% of N in TiO2.
(Color online) Conductivity variation with frequency (30 Hz to 1.4 MHz) at different temperature (a) 0% N-TiO2 and (b) 5% N-TiO2. Arrhenius plots log(ωp) vs log(σp) for activation energy evaluated about 0.31 and 0.23 eV for (c) 0% and (d) 5% of N-TiO2, respectively.
(Color online) Arrhenius plots for (a) 0% and (b) 5% of N-TiO2.
(Color online) (a) Dielectric constant and (b) dielectric loss for 0% of N-TiO2, (c) dielectric constant and (d) dielectric loss for 5% of N-TiO2 at different temperatures.
(Color online) Electric modulus vs frequency at high temperature region for (a) and (c) real modulus for 0% and 5% of N in TiO2, and (b) and (d) imaginary modulus for 0% and 5% of N in TiO2, respectively.
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