本研究的目的在於製備透明且具有可見光催化的二氧化鈦多功能自潔奈米粒子薄膜。薄膜的製備是運用全奈米粒子的靜電逐層(ELbL )組裝技術進行，製程中先將22nm 的二氧化矽奈米粒子與7nm 的二氧化鈦奈米粒子交替逐層組裝於玻璃基板上，再於氨氣氣氛下鍛燒以獲得透明的氮摻雜二氧化鈦可見光催化自潔薄膜，並與未經氮摻雜的二氧化鈦薄膜比較其自潔效果。
由掃描式電子顯微鏡剖面觀測及橢圓儀分析的實驗結果顯示，以靜電逐層組裝技術可以得到厚度呈線性成長的多層奈米粒子薄膜。但當雙層數目超過40 時，鍛燒時薄膜會龜裂，在掃描式電子顯微鏡下以低倍率可以觀測到大小不一的區塊，造成平均穿透度下降且低於玻璃；而以每30雙層重複鍛燒的製程則可製備高達60 雙層且具有94%平均穿透度的透明奈米粒子薄膜。實驗結果也顯示，透明的二氧化鈦粒子薄膜在氨氣氣氛下以高溫鍛燒可以成功地進行氮摻雜，並將光的吸收延伸至可見光區域，而平均穿透度大約只有1%的降低。此外，氮摻雜二氧化鈦奈米粒子薄膜在可見光下的光催化自潔效果隨氮含量變化有一最佳值，其中以500℃鍛燒1 小時的薄膜降解亞甲藍的效果最佳。未經氮摻雜的二氧化鈦薄膜在可見光下的光催化自潔效果則小於氮摻雜二氧化鈦薄膜。

A transparent, visible-light-active TiO2 self-cleaning surface exhibit antireflection, and self-cleaning properties have been prepared via electrostatic layer-by-layer assembly technique. Fabricate the films by ELbL with TiO2 and SiO2 nanoparticles. Then calcine the coatings under ammonia gas flow with different temperature to obtain the nitrogen-doped TiO2 self-cleaning surfaces, while the coatings without doping calcine under air.

Two process has been discussed in the research. The coatings fabricated by ELbL assembly indicate the linearly growth behavior, however, the transmittance decrease with increasing number of bilayers due to light scattering ; The repeated calcination process has progressed in this problem, which show antireflection property (T=94%) even up to 60-bilayer.Visible-light-active TiO2 self-cleaning surfaces is obtained by calcination under ammonia gas flow with different temperature which decrease the transmittance 1% only; moreover, there is an optimum experimental condition (500℃/1hr) to show best photocatalytic activity which is evaluated by the
decomposition of methylene blue with visible light illumination.

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