- 學位論文
金屬鍍膜於LB 法製備奈米粒子層之物性
Optical properties of metallic coating layers on ordered polystyrene particle films via Langmuir‐Blodgett technology
摘要
本篇論文的實驗是利用Langmuir-Blodgett 的製膜方法，以不同粒徑大小的聚苯乙烯(polystyrene,PS.)，製備成緊密堆積的二維單層膜。為使聚苯乙烯粒子容易浮於氣液介面，得到緊密堆積而不碎裂的聚苯乙烯單層膜，我們將OTAB(octyltrimethylammonium bromide)加入聚苯乙烯膠體粒子溶液中，使表面改質成為疏水性表面。 再利用熱蒸鍍法，將50nm 厚度的銀薄膜蒸鍍在已製備的聚苯乙 烯粒子薄膜上。我們以氙燈為光源，利用不同的入射角度，我們可以 得到不同粒徑大小的穿透光譜，藉由光譜強度以及所得到峰值的不同，去探討電子共振吸收對於粒徑大小的關係。 由實驗中的穿透光譜，顯示鍍銀的聚苯乙烯粒子薄膜，會有侷限 的表面電漿產生。穿透光譜的各個波峰隨著粒子變小而藍位移。而根 據馬克斯威爾方程式所導出的色散現象，並不符合實驗所得的數據， 其結構較一般週期性的次波長孔洞結構更為複雜。
並列摘要
We constructed close-packed monolayer films through Langmuir-Blodgett technology with different sizes of colloidal polystyrene (PS) particles. In order to keep away from obtaining split-up polystyrene particle films and acquire large ordered area of films, particles surfaces were functionalized hydrophobically.Then, the monolayer films were coated with 50 nm silver by thermal evaporation. By taking into account experimental data from the optical transmittance, we studied the optical behavior.By using xenon light source with different angles of incidence, the relation between the resonance absorption and the differenceparticle sizes was observed. The optical transmittance spectra show the localized surfaceplasmon effect, and the individual peaks are blue shifted with the particle size getting smaller. According to the Maxwell’s dispersion formula, the result did not match as expected.It is a more complicated structures than the subwave-length hole arrays.