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標題: | 利用彈性膜調控二維奈米金顆粒陣列之週期進而改變其表面電漿效應研究 Tunable surface plasmon resonance based on gold nanoparticles and elastic membrane-PDMS composite |
作者: | Yu-Lun Chiang 江宇倫 |
指導教授: | 陳永芳(Yang-Fang Chen) |
關鍵字: | 表面電漿,金奈米粒子,彈性膜, surface plasmon,gold nanoparticle,PDMS, |
出版年 : | 2009 |
學位: | 碩士 |
摘要: | 當金屬粒子的直徑遠小於入射光的波長時,金屬粒子內部會受到電磁波感應而產生電偶極累積在金屬粒子的表面,表面累積的電荷會隨著入射光的頻率同步震盪,造成表面電漿效應,而表面電漿會在周圍感應出交流電場,藉此影響週遭物質的光性與電性。
本篇論文主要是探討奈米金屬粒子其表面電漿受到週遭粒子交互作用之影響。為了探討此現象,我們將奈米金粒子的二維陣列製備於彈性膜(PDMS)上,藉由彈性膜易於伸縮之特性,來調控奈米金粒子陣列的週期,藉此其改變奈米粒子之間距,進而得以改變粒子之交互作用,再進行觀測表面電漿之變化。 利用數種不同化學方式將金的奈米顆粒吸附於彈性膜表面,形成單層且分布均勻的二維結構,使用場發射掃描式電子顯微鏡(SEM)觀測金奈米顆粒間的距離,接著將其一端固定,另一端置於一可水平移動的載台上,使其隨載台移動而伸張,因而改變表面電漿的共振頻率。 量測金顆粒二維陣列的消散光譜,我們發現當粒子與粒子非常靠近時,表面電漿互相影響使其共振頻率產生紅移,且此效應會隨距離拉開呈現指數遞減,此現象與電磁理論之預測相吻合。 Surface plasmon in nanoscaled materials has recently attracted a great deal of attention due to its possibility in a wide range of application. From a practical standpoint, it is desirable for the devices having a tunablility of surface plasmon frequency. To achieve this goal, in this study, a new composite consisting of two-dimensional gold nanoparticles array embedded in elastic polydimethysiloxane (PDMS) membrane has been synthesized. Because the elastic PDMS membrane has a high malleability, with an external stress, it is very easy to regulate the inter-particle distance in the gold nanoparticle array. The change of the distance between each nanoparticle will alter the surface plasmon interaction, and hence surface plasmon frequency can be manipulated. It is found that when the interparticle distance decreases, the enhanced surface plasma mutual coupling will cause the red shift of surface plasmon resonance frequency. The observed result satisfies the forecast based on electromagnetic theory. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/42951 |
全文授權: | 有償授權 |
顯示於系所單位: | 物理學系 |
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