Study of the Bandgap of Synthesized Titanium Dioxide Nanoparticules Using the Sol-Gel Method and a Hydrothermal Treatment~!2009-10-14~!2009-10-30~!2010-01-27~!

Abstract

In this work optical properties of titanium dioxide nanoparticles were studied. Titanium dioxide nanoparticles were synthesized by the sol-gel method followed by a hydrothermal treatment using tetraisopropyl orthotitanate (TIOT) and 2-propanol. The synthesized samples were characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (UV/DRS) and nitrogen adsorption-desorption methods. The bandgap energy was obtained using the Kubelka-Munk reemission function. The catalyst synthesized with a molar ratio of R 1 (water/TIOT) = 3.5 and R 2 (2-propanol/TIOT) = 15 has a predominately anatase phase. It also has a high photo degradation of methyl orange compared to TiO 2 Degussa P-25. A shift band gap energy of 3.27 was observed.

Suitability of amorphous TiO2 nanoparticles as a photoelectrode in dye sensitized solar cells: A DFT–TDDFT study

“…The calculated HOMO and LUMO energy levels for amorphous (TiO 2 ) 24 cluster lie at À6.82 and À3.19 eV (listed in Table 1). The experimental electronic gaps for bulk amorphous TiO 2 is 3.4 eV [30]. For comparison purpose, Table 1 also lists corresponding values of anatase TiO 2 cluster [11].…”

Electrochemical synthesis of nanosized TiO2 nanopowder involving choline chloride based ionic liquids

“…The value of n depends on the probability of transitions; it takes the values of 1/2, 3/2, 2 and 3 for direct allowed, direct forbidden, indirect allowed and indirect forbidden transition, respectively. The calculated E g values for the electrochemically synthesized TiO 2 anatase nanopowders, considering the indirect type transition [44,45] were found to be 2.82 eV (IL-EtOH system) and 2.93 eV (ILEG-EtOH system) as compared to a value of 3.1 eV determined for commercial TiO 2 (TitanPE Technologies, Inc., China). These results suggest that these photocatalysts might be potentially adequate to operate under visible light illumination.…”

Synthesis, characterization and photocatalytic performance of W, N, S-tri-doped TiO2 under visible light irradiation

“…The band gap (E g ) was determined using the transformed Kubelka-Munk function (inset in Fig. 3) assuming an indirect transition type [59,60]. Moreover, it is found that this improvement in the absorption properties of TiO 2 is more pronounced when it is W, N, Stri-doped.…”