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Evaluation of band gap energy of TiO2 precipitated from titanium sulphate
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NSTL
Elsevier
The determination of the band gap energy (E-g) of semiconductors powder materials can be performed from diffuse reflectance spectroscopy (DRS) measurements. For this purpose, the classical theory proposed by Kubelka and Munk (K-M) and the so-called plot Tauc, both discussed here, have been largely employed. We investigate the E-g values of anatase TiO(2 )particles synthesized by precipitation of titanyl sulphate in the presence of 5% ammonia solution and titanium and iron salts. Based on K-M function and Tauc plot and considering that the TiO2 anatase phase is an indirect band gap semiconductor, our results indicate that the samples subjected to a mechanochemical treatment (mill rotation speed equal to 300 rpm) present substantially lower E-g values compared to those reported by other authors in a recent work.
Band gap energyKubelka-munk functionTauc plotDIFFUSE-REFLECTANCE MEASUREMENTSZEOLITE NANOPARTICLES
Segundo, Iran Rocha、Afonso, Catia、Lima Jr, Orlando、Costa, Manuel F. M.、Freitas, Elisabete、Carneiro, Joaquim、Landi Jr, Salmon
NSTL
Elsevier
