為了提升二氧化鈦作為光觸媒的效率，我們試圖縮小其電子能隙以增加吸收的頻段。文獻中提到用n-type、p-type複合摻雜能大幅縮小電子能隙。以這為參考，但我們使用價數跟鈦一樣的鋯，在銳鈦礦結構的二氧化鈦奈米粒子中複合摻雜了鈷、鋯以縮小電子能隙，同時也使用價數主要為+3及+4的鈰，製作鈷、鈰複合摻雜的樣品做比較。
以X光繞射量測、拉曼光譜、延伸X光吸收精細結構、感應耦合電漿質譜儀以及紫外─可見分子吸收光譜法量出的數據，確認樣品除了部分轉變為二氧化鈦的其他結構外，應為鈷、鋯、鈰摻雜在二氧化鈦銳鈦礦中，並確認了各元素實際摻雜的比例。量出的數據顯示複合摻雜比起摻雜有更顯著的電子能隙縮小，鈷、鋯複合摻雜及鈷、鈰複合摻雜的電子能隙分別從3.12eV縮小到2.13eV及從2.36eV縮小到1.90eV。故確定在使用複合摻雜縮小銳鈦礦結構的二氧化鈦電子能隙的方法中，鈷、鋯復合摻雜及鈷、鈰復合摻雜都是可以採用的。

In this thesis, we have tried to narrow the band gap of anatase TiO2 for enhancing the visible-light absorption and therefore improving the photocatalytic activity of these photocatalysts. Recently, n-type and p-type co-doping has been reported to achieve larger band-gap reduction in anatseTiO2 compared to monodoping of the same elements. In contrast to the above cases, we have co-doped Zr and Ce, which have the same oxidation state as Ti, with the Co dopant to form Co-Zr and Co-Ce co-doped anataseTiO2, respectively.
A variety of experimental methods such as x-ray diffraction, Raman spectroscopy, EXAFS, ICP-MS and UV-Vis spectroscopy have been employed in our work. Except for some minor rutile or brookite phase formation, most of the samples were shown to be in the form of doped anatase TiO2. The concentration of dopant atoms successfully incorporated into the sample has also been measured. Our experimental data show that the band gap narrowing effect is substantially enhanced in co-doped samples compared to that in the monodoped samples. Quantitatively, we have found the band gap to reduce from 3.12eV for the Co-doped sample to 2.13eV for Co-Zr codoped sample and from 2.36eV for the Ce-doped sample to 1.90eV for the Co-Ce co-doped sample of TiO2. Our results demonstrate that Co -Zr and Co-Ce co-doping are very effective for narrowing the band gap of anatase TiO2.

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