本研究是以有機/無機材料來製備高/低折射率交互的多層光學薄膜，以二氧化鈦(TiO2)溶膠溶液與HEMA聚合物來製備具高折射率之有機無機溶液，¬而低折射率是以二氧化矽(SiO2)溶膠溶液與MMA聚合物來製備有機無機溶液，再以旋轉塗佈的方式製備具適當厚度之高低折射交互多層有機無機薄膜。 藉由粒徑2.69 nm之TiO2溶膠溶液與HEMA行聚合反應，當TiO2 體積百分率為27%，即其固含量為62.9 wt%的固定比例混成聚合所得之薄膜，其折射率為1.75。另一方面，粒徑大小為14 nm之SiO2溶液與MMA行聚合反應，當SiO2體積百分比為30 %，即其固含量為53.3 wt%的固定的比例混成聚合所得之薄膜的折射率為1.44。將此兩種溶液經交互多層塗佈35層，經模擬計算可以得到在可見光波長範圍維持 90％以上的透明度，而在近紅外光波長的範圍，則能夠達到80％以上之遮蔽效果。實際塗佈測試結果顯示，也可得在可見光的範圍維持 80％以上透明度，而近紅外光的範圍可達60％以上的遮蔽效果。 除此之外透過掃瞄式電子顯微鏡的觀察，有機無機混成所製備出的薄膜其表面皆相當的均勻同時也具有良好的成膜性，更重要的是以旋轉塗佈的方式所製備出的多層膜，確實能夠將膜厚控制在99%以上的精準性。 The research is to prepare the nanoparticle solution and coat it on the building windows to absorb the selective frequency of varied lights (NIR) to decrease temperature of the building. High refractive index optical thin films were using coating solution prepared by polymerization of HEMA in TiO2 sol. On the other hands, low refractive index optical thin films were using coating solution prepared by polymerization of MMA in SiO2 sol. The multi-layer film was prepared by alternating spin-coating high and low refractive indices coating solution. When coating solution was prepared by polymerization of HEMA in TiO2 sol. which diameter was 2.69 nm and the volume percentage of TiO2 was 27, the refractive index was 1.75. On the other hands, when coating solution was prepared by polymerization of MMA in SiO2 sol which diameter was 14 nm and the volume percentage of SiO2 was 30, the refractive index was 1.44. The simulation showed that the transmittance of visible light was greater than 90% and that of near-infra-red light was lower than 30% when the 23 layers film by alternating this low and high refractive indices. The experiment result showed that the transmittance of visible light was greater than 90% and that of near-infra-red light was lower than 40% when the film with 23 layers by alternating spin-coating this low and high refractive indices coating solution.
