Crystalline phase transformation of electrospinning TiO2 nanofibres carried out by high temperature annealing

• Published in: Journal of molecular structure Vol. 1194; pp. 163 - 170
• Main Authors: Secundino-Sánchez, O., Diaz-Reyes, J., Aguila-López, J., Sánchez-Ramírez, J.F.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.10.2019
• Subjects: Electrospinning technique; Raman spectroscopy; Semiconductor nanofibres; Structural properties; Titanium dioxide; X-ray diffraction; X-ray diffraction; Electrospinning technique; Raman spectroscopy; Titanium dioxide; Structural properties; Semiconductor nanofibres
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2019.05.092

In this work reports the crystalline phase transformation of electrospinning TiO2 nanofibres by annealing at high temperatures. The nanofibres chemical stoichiometry was determined by Energy-dispersive X-ray spectroscopy (EDS), which allowed find that the TiO2 crystal phase transformation is caused by oxygen vacancy generation. The TiO2 nanofibres diameter varied from 137.0 to 115.3 nm in the temperature range of 100–1000 °C, which was estimated by Scanning Electron Microscopy. The TiO2 nanofibres structural transformation from pure anatase to pure rutile structures, including the quasi-amorphous and anatase-rutile mixed phases has been confirmed by Raman scattering and X-ray diffraction. The Raman spectroscopy exhibits the anomalous behaviour for band broadening and shifting of Raman bands with increasing crystallite size that form the nanofibres. By X-ray diffraction was found that the nanofibres crystalline phases present as preferential growth direction (101) for anatase and (110) for rutile. [Display omitted] •TiO2 nanofibres were successfully synthesised by electrospinning technique at 300 K.•Crystal phase transformation through high-temperature annealing of TiO2 nanofibres.•Study by Raman scattering of crystal phase transformation of annealed TiO2 nanofibres.•By XRD found that the TiO2 crystalline phase depends on the annealing temperature.•The spectrospun TiO2 crystalline phase transformation is caused by oxygen vacancies.