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研究生:陳逸杰
研究生(外文):Yi-chieh Chen
論文名稱:金奈米顆粒披覆之聚二甲基矽氧烷光波導之製作及其區域表面電漿量測應用
論文名稱(外文):Fabrication of PDMS Waveguide Coated with Gold Nano-particles and Its Localized SPR Applications
指導教授:林哲信
指導教授(外文):Lin, Che-Hsin
學位類別:碩士
校院名稱:國立中山大學
系所名稱:機械與機電工程學系研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:97
中文關鍵詞:光波導金奈米顆粒光纖生物感測器區域式表面電漿共振
外文關鍵詞:optical biosensorPDMSoptical waveguideLSPRAu nanoparticles
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本研究提出一種以PDMS高分子材料所製作之新式光波導元件,並進行效能測試與生物感測應用。有別於傳統光纖式感測器,本光學感測器使用PDMS為主要的元件材料。PDMS擁有極佳的光學特性,並具有良好的生物檢測的能力,如:具有高韌性與生物相容性。本製程主要使用鐵氟龍管做為PDMS澆鑄模仁,利用微鑄造製作一PDMS圓柱,由於固化後之PDMS材料折射係數為1.43,藉由此一特性可在折射率較低的媒介中,形成一光波導的架構,其後使用PDMS與傳統塑膠光纖進行連接,形成本研究提出的光波導系統。
為了增加PDMS光波導的效能,本研究進行二次表面塗層,以降低光波導表面因製程所產生的粗糙度;並進行粗糙度改善後的PDMS光波導光損失測試,由1.71 dB/cm降低到1.14 dB/cm。此外本研究使用帶有正電離子的高分子長鏈PDDA,塗佈在PDMS上以吸附帶負電之金奈米顆粒,同時為了增加吸附效率,本實驗使用自行開發之大氣電漿系統,對PDMS進行表面改質。而根據光譜儀與電子顯微鏡圖片可發現,經過大氣電漿改質的PDMS表面,其金奈米顆粒在表面積佔有率上明顯的增加且效果均勻,而其吸收光譜也有明顯的增加。本實驗並以甘油調配不同折射係數溶液,證實本光波導式區域表面電漿共振系統之感測能力,其線性靈敏度分別為7.253 AU/RIU與325.97 nm/RIU。最後將本實驗架構應用在與免標定的核甘酸生物檢測上,利用本光波導系統,在光波導上先修飾上飽和的單股的核甘酸形成一生物探針,並以雜交行為抓取特定序列的目標核甘酸,其過程未經過螢光標定,僅在探針端修飾上硫醇基,其偵測極限約可達10 pM左右。
本研究提出一迅速穩定,成本低廉,尺寸控制容易且精準的光波導製程,利用正負電吸引的方式塗佈一層金奈米顆粒,並成功應用在區域式表面電漿共振針對介電常數改變與生物感測器上。
This research proposes a novel polymer-based optical waveguide made with Polydimethylsiloxane (PDMS) for optical detection applications. Alternative to other fiber-based sensor, the proposed optical sensor uses PDMS waveguide as the main sensing component. PDMS has excellent optical properties which is essential for bio-photonic detection, including highly optical transparency, good flexibility and high bio-compatibility.
Uncured PDMS polymer is cast in a Teflon tubing to form the PDMS rod. Since the reflective index of PDMS is as high as 1.43, that the bare PDMS can be an optical waveguide while the reflective index of the surrounding media is smaller than 1.43. The cast PDMS waveguide is then connect with plastic optical fibers to form the proposed optical waveguide system. In order to improve the optical performance of the PDMS waveguide, a surface coating process is used to reduce the surface roughness of the PDMS waveguide. The measured insertion loss with and without performing the surface coating procedure is 1.14 and 1.71dB/cm, respectively. Once the PDMS waveguide is formed, Au nanoparticles (Au-Nps) were coated on the PDMS surface with the assistance of a positive charge polymer of PDDA to form an optical waveguide capable of localized SPR detection. In addition, an atmospheric plasma treating process is used to enhance the coating ratio and speed of Au-Nps. UV-VIS spectrum and the SEM observation of the Au-particle coated PDMS waveguide confirm that the plasma treatment process significantly improves the coating results of Au-Nps.
Liquid samples with different refractive index were used to demonstrate the LSPR sensing ability of the fabricated optical waveguide. The label free DNA detection was demonstrated by the system. The thiolated single strand DNA was modify on the PDMS optical waveguide as a DNA probe and bound with target DNA by DNA hybridization. The detection limit is as low as 10 pM. This research provides a simple and fast fabrication method to fabricate waveguide-based LSPR sensors.
目錄 I
圖目錄 IV
簡寫表 VIII
符號表 X
摘要 XII
Abstract XIV
第一章 緒論 1
1.1 前言 1
1.2 光纖生物感測器 3
1.3 研究動機與目的 6
1.4 研究方法 7
1.5 論文架構 8
第二章 表面電漿理論與文獻回顧 10
2.1光纖生物感測器基本原理 10
2.1.1瞬逝波 10
2.2表面電漿共振原理 12
2.2.1表面電漿共振 12
2.3 表面電漿共振產生機制 17
2.3.1 稜鏡式表面電漿共振 17
2.3.2 光纖式表面電漿共振 19
2.3.3奈米粒子表面電漿共振 22
2.4 奈米顆粒吸附動力學理論 27
2.5 實驗設計概念 36
第三章 實驗方法 37
3.1 PDMS光波導製程 37
3.1.1 PDMS性質簡介 37
3.1.2 PDMS光波導製程 39
圖3.2 PDMS光波導元件製程圖(a)灌模(b)固化(c)取出成形PDMS(d)表面活化(e)金奈米顆粒吸附(f)與光纖接合 40
3.2製程改善與表面處理 43
3.2.1表面粗糙度改善 43
3.3 金奈米顆粒合成 47
3.4 實驗架構 48
第四章 結果與討論 50
4.1 光波導效率量測 50
4.2 光波導表面大氣電漿處理結果 51
4.3 金奈米顆粒於PDMS表面之吸附動力學 60
4.4 光波導區域式表面電漿共振檢測效能分析 64
4.5 光波導區域式表面電漿共振生物感測之應用 67
第五章 結論 72
5.1 結論 72
5.2 未來展望 74
參考文獻 75
自述 79
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