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(Color online) (a) FESEM images of TiO2 NTs. (b) Lateral view FESEM images of TiO2 NT layers. XRD patterns of as-prepared TiO2 NTs and samples annealed under (c) field intensities of 0, 2, 4, 6, and 8 T (θ: 90°) and (d) field directions of 0°, 50°, and 90° (H: 6 T).
(Color online) PL spectra of samples annealed under (a) different field intensities and (b) different field directions. PL spectra and Gaussian fit bands of samples annealed (c) without and (d) with a high magnetic field (H: 6 T, θ: 90°) (excitation wavelength: 325 nm).
(Color online) The position of the four PL peaks vs (a) the field intensity and (b) direction, respectively. The intensity of the four PL peaks vs (c) the field intensity and (d) direction, respectively. The average crystallite sizes of TiO2 NTs, annealed under (e) different field intensities and (f) different directions, calculated by the Scherrer equation.
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