Abstracts Book - IMRC 2018

• SF2-P034
EFFECT OF ANNEALING TEMPERATURE ON STRUCTURAL AND
OPTICAL PROPERTIES OF TIO2 NANOFIBERS
Oscar Secundino Sánchez 1 , Joel Díaz Reyes 2 , Noe Sánchez González 1 , José Francisco Sánchez
Ramírez 2 , Angel Netzahual Lopantzi 1 , Edgar Oliver Lopez Villegas 3 , Orlando Zaca Moran 1
1 Instituto Politécnico Nacional - IPN, Unidad Profesional Interdisciplinaria en Ingeniería y
Tecnologías Avanzadas, Mexico. 2 Instituto Politécnico Nacional - IPN, Centro de Investigación
en Biotecnología Aplicada, Mexico. 3 Escuela Nacional de Ciencias Biológicas, IPN, Mexico.
Titanium oxide (TiO 2 ) is currently a compound with multiple applications due to
its extraordinary optical properties, which are dependent on the size, shape and
crystal structure type. This work presents the study of the evolution of the
amorphous-anatase-rutile crystalline phase as a function of the treatment
temperature in a wide range (100 to 1000ºC) of the electrospun TiO 2 nanofibers.
The effect annealing temperature on crystalline and optical properties was
investigated using UV-visible spectroscopy, X-ray diffraction and Raman
scattering. X-ray diffraction analysis and Raman scattering reveal that the TiO2
nanofibers showed the crystalline phase of anatase at annealing temperatures
below 500°C. At temperatures above 700°C they present the rutile crystalline
phase and in the range of 500-700°C they present both phases, although the
dominant crystalline phase is anatase. Raman scattering for samples annealed
at low temperatures shows that the lattice dynamics is characteristic of bimodal
behaviour and the multipeaks adjust of the first optical longitudinal mode for
the TiO 2 denotes the Raman shift of the characteristic peak at 140.9 cm -1 is
associated to the vibration of bending 0-Ti-0 (E g ), which denotes the Raman shift
of the characteristic peak of the nanocrystals of the anatase phase. The Raman
scattering for samples annealed at high temperatures presents two
characteristic peaks at 440.7 and 609.6 cm -1 characteristics of the rutile phase.
TiO 2 nanofibers exhibit an indirect band gap that decreases slightly with
increasing annealing temperature 3.70 to 2.14 eV, which was obtained by
absorbance measurements at room temperature.
Keywords: Titanium oxide, Electrospun nanofibers, TIO2 phases evolution
Presenting authors email: oscar-secundino@hotmail.com