Systematic Characterization of the Crystalline Phase Transformation, from Amorphous to Rutile through Anatase, of TiO2 Nanofibers Synthesised by Electrospun Technique

Oscar Secundino-Sánchez; Joel Díaz-Reyes; José F. Sánchez-Ramírez; José S. Arias-Cerón; Miguel Galván-Arellano; Ángel Guillen-Cervantes

doi:10.4028/p-044t3c

Paper Titles

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Systematic Characterization of the Crystalline Phase Transformation, from Amorphous to Rutile through Anatase, of TiO₂ Nanofibers Synthesised by Electrospun Technique
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HomeJournal of Nano ResearchJournal of Nano Research Vol. 72Systematic Characterization of the Crystalline...

Systematic Characterization of the Crystalline Phase Transformation, from Amorphous to Rutile through Anatase, of TiO₂ Nanofibers Synthesised by Electrospun Technique

Abstract:

TiO₂ nanofibers were synthesised by means of the electrospun technique, which were annealed at high temperatures to achieve the crystalline phase transformation from amorphous to rutile through anatase and the phase mixture. The chemical stoichiometry of electrospun TiO₂ nanofibers was estimated by EDS, finding that at low annealing temperatures excess of oxygen was detected and at high temperatures excess of titanium that originates oxygen vacancies. The TEM images showed clearly the formation of TiO₂ nanofibers (NF’s) that exhibit a homogeneous and continuous aspect without the presence of crystalline defects, whose surface morphology depends strongly on the annealing temperature. The crystalline phase transformation was studied by Raman spectroscopy, which revealed that annealed TiO₂ NF’s showed a crystalline phase transformation from amorphous, pure anatase, anatase-rutile mixed, to pure rutile as the annealing temperature increased, which was corroborated by X-ray diffraction and high-resolution TEM. The average grain size, inside the NF´s, increased with the crystalline phase transformation from 10 to 24 nm for anatase-TiO₂ and from 30 to 47 nm for rutile-TiO₂, which were estimated by using the Scherrer-Debye equation. By absorbance measurements at room temperature the band gap energy (E_g) was obtained, which is ranged in 3.75-2.42 eV, caused by the amorphous → anatase → anatase-rutile mixed → rutile crystalline phase transformation.