Evaluation of band gap energy of TiO2 precipitated from titanium sulphate

The determination of the band gap energy (Eg) semiconductors powder materials can be performed from diffuse reflectance spectroscopy (DRS) measurements. For this purpose, classical theory proposed by Kubelka and Munk (K-M) so-called plot Tauc, both discussed here, have been largely employed. We investigate Eg values anatase TiO2 particles synthesized precipitation titanyl sulphate in presence 5% ammonia solution titanium iron salts. Based on K-M function Tauc considering that phase is an indirect semiconductor, our results indicate samples subjected to a mechanochemical treatment (mill rotation speed equal 300 rpm) present substantially lower compared those reported other authors recent work.