Characterization of Nanoscaled TiO2 Produced by Simplified Sol–Gel Method Using Organometallic Precursor
Journal
Journal of Engineering Materials and Technology
Date Issued
2015-04
Author(s)
P. Paunović, A. Grozdanov, A. Češnovar, B. Ranguelov, P. Makreski, G. Gentile, E. Fidančevska
DOI
10.1115/1.4029112
Abstract
This work is concerned with development of sol–gel method for preparation of nanoscaled
TiO2 using organometallic precursor—titanium tetraisopropoxide (TTIP) and
determination of the present crystalline phases depending on the temperature of further
thermal treatment. The characteristic processes and transformations during the thermal
treatment were determined by means of thermal gravimetric analysis and/or differential
thermal analysis (TGA/DTA) method. The crystalline structure and size of the TiO2 crystallites
were analyzed by means of Raman spectroscopy and X-ray powder diffraction
(XRPD) method. At 250 C, cryptocrystalline structure was detected, where amorphous
TiO2 is accompanied with crystalline anatase. The anatase crystallite phase is stable up
to 650 C, whereas at higher temperature rutile transformation begins. It was observed
that at 800 C, almost the whole TiO2 is transformed to rutile phase. According to XRPD
analysis, the increase of the temperature influences on the increase of the size of the crystalline
particles ranging from 6 nm at 250 C to less than 100 nm at 800 C. The size and
shape of the TiO2 crystalline particles were observed by transmission electron microscopy
(TEM). The shape of the studied samples changes from nanospheres (250, 380, and
550 C) to nanorods (650 and 800 C). Morphology of the formed TiO2 aggregates was
observed by scanning electron microscopy (SEM).
TiO2 using organometallic precursor—titanium tetraisopropoxide (TTIP) and
determination of the present crystalline phases depending on the temperature of further
thermal treatment. The characteristic processes and transformations during the thermal
treatment were determined by means of thermal gravimetric analysis and/or differential
thermal analysis (TGA/DTA) method. The crystalline structure and size of the TiO2 crystallites
were analyzed by means of Raman spectroscopy and X-ray powder diffraction
(XRPD) method. At 250 C, cryptocrystalline structure was detected, where amorphous
TiO2 is accompanied with crystalline anatase. The anatase crystallite phase is stable up
to 650 C, whereas at higher temperature rutile transformation begins. It was observed
that at 800 C, almost the whole TiO2 is transformed to rutile phase. According to XRPD
analysis, the increase of the temperature influences on the increase of the size of the crystalline
particles ranging from 6 nm at 250 C to less than 100 nm at 800 C. The size and
shape of the TiO2 crystalline particles were observed by transmission electron microscopy
(TEM). The shape of the studied samples changes from nanospheres (250, 380, and
550 C) to nanorods (650 and 800 C). Morphology of the formed TiO2 aggregates was
observed by scanning electron microscopy (SEM).
File(s)![Thumbnail Image]()
Loading...
Name
2015 MATS ASME.pdf
Size
1.99 MB
Format
Adobe PDF
Checksum
(MD5):caaeb74c681ee7083a220af7c6779eb8