Structure, Morphology and Conductive Properties of Sn-doped TiO2

Authors I.F. Mironyuk , T.R. Tatarchuk, V.O. Kotsyubynsky , V.I. Mandzyuk , Kh.O. Savka, I.M. Mykytyn

Vasyl Stefanyk Precarpathian National University, 57, Shevchenko St., 76018 Ivano-Frankivsk, Ukraine

Issue Volume 12, Year 2020, Number 6
Dates Received 01 September 2020; revised manuscript received 15 December 2020; published online 25 December 2020
Citation I.F. Mironyuk, T.R. Tatarchuk, V.O. Kotsyubynsky, et al., J. Nano- Electron. Phys. 12 No 6, 06024 (2020)
PACS Number(s) 61.43.Gt, 72.80.Tm, 81.20.Fw
Keywords Titania (2) , Rutile, Anatase, Tin (IV) oxide, Specific conductivity.

The effect of Sn doping on the structure and morphology of Sn-doped TiO2 samples has been investigated. The doped titania has been obtained by sol-gel synthesis using titanium aquacomplex precursor [Ti(OH2)6]3+·3Cl– and SnCl4 as a modifier. The structure and morphology of the samples have been studied through XRD analysis, TEM, low-temperature porometry, IR-spectroscopy, and EDS analysis. The conductivity of Sn-doped TiO2 samples has been investigated by impedance spectroscopy. It was shown that the Sn-doped titania samples contain both anatase and rutile phases. The anatase/rutile ratio depends on the Sn content: the increasing Sn (IV) content from 3 to 12 % (wt.) leads to an increase in rutile content from 33.8 to 97.1 % (wt.). An increase in Sn content causes a decrease in the lattice parameter a and an increase in the parameter c. The presence of rod-shaped and needle-like rutile particles in the Sn-doped TiO2 samples has been observed by TEM. The specific surface area for 6Sn/TiO2 reached 290 m2/g. All the Sn-doped titania samples belong to the mesoporous materials. The mechanism of structure-forming processes is explained by existing Sn(OH)4·2H2O molecules in the reaction medium, which act as the centers of nucleation, growth and crystallization for rutile nanoparticles. The increase in Sn content leads to a decrease in the specific resistance of the studied materials compared to the undoped titania sample.

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