應用在許多方面的二氧化鈦奈米顆粒，ㄧ般採用溶膠凝膠法製備而得。在溶膠凝膠法的製備上，由於不同的製備情況，所得到的二氧化鈦可能具有銳鈦礦(anatase)、金紅石(rutile)和板鈦礦(brookite)三種結晶相。在本實驗，我們發展一套有別於ㄧ般溶膠凝膠法的獨特製程方法，製備出有利於電子輸送以及避免電荷產生再結合，當做染料敏化太陽能電池電極材料的高純度銳鈦礦二氧化鈦膠體。在我們發展的製程中，以TiO6八面體排列形成zigzag結構的鈦酸鹽當做中間產物，zigzag結構也是銳鈦礦二氧化鈦的特徵。由XRD以及Raman的結果得知，以我們發展的製程製備出二氧化鈦膠體為純銳鈦礦。相對地，在相同溫度下，以溶膠凝膠法製備出的二氧化鈦主要成分為銳鈦礦以及少量的金紅石和板鈦礦。由於高純度銳鈦礦，我們以方向性鈦酸鹽製程所製備出二氧化鈦膠體來製作中孔薄膜，應用在染料敏化太陽能電池上有非常好的表現。

TiO2 nanoparticles used in numerous applications are generally prepared from the sol-gel method. Because of the different preparation conditions, formation of the three TiO2 polymorphs, anatase, brookite and rutile, in the sol-gel synthesis. The present work demonstrates a unique route, alternative to the conventional sol-gel method, to prepare high-purity anatase TiO2 colloids, which can be deposited as electrodes for dye-sensitized solar cells to facilitate electron transport and avoid charge recombination. In this developed route, a titanate with its TiO6 octahedra arranged in a zigzag configuration, which is also a characteristic feature of anatase TiO2, is produced as an intermediate. XRD and Raman analysis shows that a phase-pure anatase TiO2 colloid is prepared from the developed route, while the TiO2 derived from the sol-gel at the same temperature is predominantly composed of anatase with the presence of a minute amount of rutile and brookite. Because of the high-purity in anatase phase, the TiO2 colloid derived from the titanate-directed route is shown to constitute a mesoporous film exhibiting high performance in a dye-sensitized solar cell.

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