TY - JOUR
T1 - Stimulation of the photoluminescent properties of electrospinning TiO2 nanofibres induced by structural modifications resulting from annealing at high temperatures
AU - Secundino-Sánchez, O.
AU - Díaz-Reyes, J.
AU - Sánchez-Ramírez, J. F.
AU - Martínez-Juárez, J.
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/11
Y1 - 2019/11
N2 - Electrospinning technique has been used to prepare TiO2 nanofibres. The crystalline phase transformation occurred due to thermal treatments in the temperature range of 100–1000 °C, from anatase to rutile through the anatase-rutile mixed, which was verified by X-ray diffraction, high-resolution transmission electronic microscopy and Raman scattering. The effects of the annealing temperature on the surface morphology and the chemical stoichiometry of titanium dioxide nanofibres were determined by scanning electron microscopy and energy dispersion spectrometry. The nanofibres diameter was in the range of 115–137 nm in the investigated temperature range. Clear evidence of structural phase transformation from pure anatase to pure rutile structures including the anatase-rutile mixed phase have been obtained by ultraviolet–visible and photoluminescence spectroscopy. TiO2 nanofibres band gap energy could be tuned from 3.59 to 2.42 eV by varying the annealing temperature estimated by room temperature absorbance. The photoluminescent emission ranged in the 2.36–1.47 eV region as a function of the thermal treatment temperature, which is a consequence of the TiO2 nanofibres crystalline phase transformation and reduction of the band gap energy.
AB - Electrospinning technique has been used to prepare TiO2 nanofibres. The crystalline phase transformation occurred due to thermal treatments in the temperature range of 100–1000 °C, from anatase to rutile through the anatase-rutile mixed, which was verified by X-ray diffraction, high-resolution transmission electronic microscopy and Raman scattering. The effects of the annealing temperature on the surface morphology and the chemical stoichiometry of titanium dioxide nanofibres were determined by scanning electron microscopy and energy dispersion spectrometry. The nanofibres diameter was in the range of 115–137 nm in the investigated temperature range. Clear evidence of structural phase transformation from pure anatase to pure rutile structures including the anatase-rutile mixed phase have been obtained by ultraviolet–visible and photoluminescence spectroscopy. TiO2 nanofibres band gap energy could be tuned from 3.59 to 2.42 eV by varying the annealing temperature estimated by room temperature absorbance. The photoluminescent emission ranged in the 2.36–1.47 eV region as a function of the thermal treatment temperature, which is a consequence of the TiO2 nanofibres crystalline phase transformation and reduction of the band gap energy.
KW - Crystalline phase transformation
KW - Electrospinning technique
KW - Optical properties
KW - Semiconductor nanofibres: titanium dioxide
KW - Structural properties
KW - Thermal treatment
UR - http://www.scopus.com/inward/record.url?scp=85070652444&partnerID=8YFLogxK
U2 - 10.1016/j.jlumin.2019.116700
DO - 10.1016/j.jlumin.2019.116700
M3 - Artículo
AN - SCOPUS:85070652444
SN - 0022-2313
VL - 215
JO - Journal of Luminescence
JF - Journal of Luminescence
M1 - 116700
ER -