本研究的目的在於製備超親水自潔而且具備抗反射性質的奈米粒子薄膜。運用全奈米粒子的靜電吸附逐層組裝（ELbL assembly）可在玻璃基板上交替沉積7 nm二氧化鈦粒子及22 nm二氧化矽粒子的TiO2/SiO2雙層，並透過週期性的重複燒逐層組裝之製程，在文獻中首次成功地將雙層數目提高至120，而且可保持高達94%的平均穿透度並具有良好的親水性及紫外光催化自潔效果。
藉由光學薄膜商用軟體的模擬設計與分析，得知當TiO2/SiO2 (7nm/22nm)奈米粒子薄膜的折射率維持在1.28的條件下，即使厚度超過微米尺寸，仍然有95%的平均穿透度。實驗結果顯示，以每30個雙層為週期進行重複燒逐層組裝的製程，可成功地製備出雙層數目為120且仍為透明的粒子薄膜；相較之下，以逐層組裝的製程所製備的粒子薄膜，在雙層數目為60時平均穿透度已降至87%，當雙層數目再增為80時，平均穿透度更降為67%。經低倍率顯微觀測，推測應是薄膜於燒時龜裂，形成大小不一的區塊所致。此外，由橢圓儀及掃描式電子顯微鏡的測定數據得知粒子薄膜的折射率平均為1.30，且薄膜以每雙層約20 nm的厚度線性成長，與模擬的結果符合。本研究也將不同雙層數目的粒子薄膜進行亞甲藍的紫外光催化降解實驗。結果顯示不論是真接在亞甲藍水溶液中進行光催化或是先吸附亞甲藍再進行光催化，重複燒逐層組裝的製程所製備的120雙層奈米粒子薄膜皆具有最佳的光催化降解效率。

In this study, the fabrication of superhydrophilic self-cleaning and anti- reflective nanoparticle thin films has been developed. Layer-by-layer (LbL) assembly of TiO2 and SiO2 nanoparticles deposition alternately as a bilayer was performed using glass substrate and first raise the number of bilayers with repeated calcination up to 120 which exhibiting antireflection, superhydro- philicity and self-cleaning properties.
Commercial optical thin film software was used to design and analyze the TiO2/SiO2 nanoparticle thin films based on the fixed refractive index of 1.28 and the average transmittance about 95% even with micro-scale thickness was realized. Transparent 120-bilayer nanoparticle thin films were successfully fabricated by LbL assembly with repeated calcination every 30 bilayers as a period. By contrast, the average transmittance of the nanoparticle thin films fabricated by LbL assembly lowered to 87% and 67% as the number of bilayers increased to 60 and 80, respectively. It was supposed that the reduced transparency resulted from the cracks contributing various blocks. In addition, average refractive indices of the nanoparticle thin films about 1.30 and linear growth behavior nearly 20 nm for a bilayer of the multilayers were determined using ellipsometry and scanning electron microscopy. Furthermore, photo- catalytic degradation of methylene blue by the nanoparticle thin films with different number of bilayers under UV illumination was studied via solution and adsorption method. In both cases, 120-bilayer nanoparticle thin films fabricated by LbL assembly with repeated calcination showed the best self-cleaning property.

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