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Research Papers

Characterization of Nanoscaled TiO2 Produced by Simplified Sol–Gel Method Using Organometallic Precursor

[+] Author and Article Information
Perica Paunović

Faculty of Technology and Metallurgy,
SS Cyril and Methodius University,
Rudjer Bošković, 16,
Skopje 1000, Republic of Macedonia
e-mail: pericap@tmf.ukim.edu.mk

Anita Grozdanov

Faculty of Technology and Metallurgy,
SS Cyril and Methodius University,
Rudjer Bošković Str., 16,
Skopje 1000, Republic of Macedonia
e-mail: anita@tmf.ukim.edu.mk

Andrej Češnovar

OKTA Crude Oil Refinery AD,
Skopje 1000, Republic of Macedonia
e-mail: cesnovar.andrej@gmail.com

Petre Makreski

Institute of Chemistry,
Faculty of Natural Sciences and Mathematics,
SS Cyril and Methodius University,
Arhimedova Str., 5,
Skopje 1000, Republic of Macedonia

Gennaro Gentile

Institute for Chemistry and
Technology of Polymers,
National Research Council,
Fabricato Oliveti 70,
Pozzuoli, Napoli 80078, Italy
e-mail: gengenti@ictp.cnr.it

Bogdan Ranguelov

Institute of Physical Chemistry,
Bulgarian Academy of Sciences,
Acad.G.Bonchev Str., Bl.11,
Sofia 1113, Bulgaria
e-mail: rangelov@ipc.bas.bg

Emilija Fidančevska

Faculty of Technology and Metallurgy,
SS Cyril and Methodius University,
Rudjer Bošković Str., 16,
Skopje 1000, Republic of Macedonia
e-mail: emilijaf@tmf.ukim.edu.mk

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received October 6, 2013; final manuscript received November 8, 2014; published online December 15, 2014. Assoc. Editor: Vadim V. Silberschmidt.

J. Eng. Mater. Technol 137(2), 021003 (Apr 01, 2015) (7 pages) Paper No: MATS-13-1184; doi: 10.1115/1.4029112 History: Received October 06, 2013; Revised November 08, 2014; Online December 15, 2014

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).

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Figures

Grahic Jump Location
Fig. 1

TGA curve of the Ti(OH)4 produced after sol–gel procedure

Grahic Jump Location
Fig. 2

DTG curve of the Ti(OH)4 produced after sol–gel procedure

Grahic Jump Location
Fig. 3

DTA curve of the Ti(OH)4 produced after sol–gel procedure

Grahic Jump Location
Fig. 4

Raman spectra of TiO2 produced by thermal treatment of Ti(OH)4 at different temperatures

Grahic Jump Location
Fig. 5

XRPD patterns of TiO2 produced by thermal treatment of Ti(OH)4 at different temperatures

Grahic Jump Location
Fig. 6

TEM images of TiO2 produced by thermal treatment of Ti(OH)4 at (a) 250 °C, (b) 380 °C, (c) 550 °C, (d) 650 °C, and (e) 800 °C

Grahic Jump Location
Fig. 7

SEM images of TiO2 produced by thermal treatment of Ti(OH)4 at (a) 250 °C, (b) 380 °C, and (c) 800 °C

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