二酸化チタンの光電池特性および光触媒特性に及ぼす不純物添加の影響

概要

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Sol-gel method has been used in the formation of thin titania layers. The starting solution used to prepare titania films was a mixture of tetraethlorthotitanate (TEOT) dissolved in ethanol and acetylacetone (acac). The resulting solution was stirred and added a nitric acid, and a yellow transparent sol was obtained. In the case of metal-doped titania, metal nitrates were used with nitric acid. By the spin-coating technique, titania sol deposited on qualtz and ITO substrates. The resulting samples were heated up to 550℃ and measured their optical band gap and abilities of photoelectrochemical cell. In lower iron content (up to 2at%), the optical absorption spectra are same as a pure titania sample. In higher iron content (more than 5%), optical band gap have been lowered, and finally reaches about 2.9eV (3.3eV in pure titania). The differences of the effects of iron and indium doping on optical absorption properties and photovoltaic/photocatalitic characteristics were also discussed.
2005-12-20