以靜電紡絲技術製備鈦酸鈷/銀複合奈米纖維於表面增強拉曼散射之研究

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研究生：	鄒宜勳 Yi-Syun Chou
論文名稱：	以靜電紡絲技術製備鈦酸鈷/銀複合奈米纖維於表面增強拉曼散射之研究 Study on Surface Enhanced Raman Scattering of CoTiO3/Ag Composite Nanofibers Fabricated by Electrospinning Method
指導教授：	李勝偉 Sheng-Wei Lee
口試委員:
學位類別：	碩士 Master
系所名稱：	工學院 - 材料科學與工程研究所 Graduate Institute of Materials Science & Engineering
論文出版年：	2016
畢業學年度：	104
語文別：	中文
論文頁數：	66
中文關鍵詞：	靜電紡絲、鈦酸鈷、表面增強拉曼散射
外文關鍵詞：	electrospinning, CoTiO3,, surface-enhanced Raman scattering
相關次數：	點閱：15 下載：0
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表面增強拉曼散射 (SERS) 於近幾年已發展成為一個超靈敏的檢測分析工具，並用於各種不同的領域，但是要邁向商品化最大的挑戰為穩定的製程以及如何製作具有高再現性、高穩定度、高靈敏度且可重複使用的SERS基板，因此本研究致力於使用具有高介電常數的CoTiO3作為基板進一步提升SERS的增強效果。
本研究利用靜電紡絲法 (Electrospinning method) 經由不同退火溫度製作CoTiO3/Ag複合奈米纖維，探討其SERS效應，結果顯示經過退火700℃後的奈米纖維表面有明顯的奈米銀顆粒，當入射光照射時會在金屬表面產生表面電漿共振並形成高度增強的近場，拉曼散射光也因此增強數十至數百倍，所以有最強的SERS強度，其SERS強度與濃度呈線性關係，可用來做未知濃度的測定，且本研究製作的SERS基板具有可靠度，並可經由去離子洗滌後重複使用。最後我們進一步將CoTiO3/Ag複合奈米纖維製備成具有較高機械強度的螺旋結構，降低奈米銀顆粒之間的距離以增強SERS效果並提高實用性。

In recent years, surface-enhanced Raman scattering (SERS) has become an ultrasensitive analytical tools, which could be widely applied in various fields. However, the major challenge of towards commercialization is to establish a reliable and reusable SERS-active substrates with high reproducibility, and sensitivity. Taking the above considerations into account, this study focus on the fabrication of CoTiO3/Ag composite nanofibers and study on their SERS performances.
In this study, we fabricate CoTiO3/Ag composite nanofibers by using the electrospinning method. We also compare the SERS activities of CoTiO3/Ag-nanofiber substrates which were annealed at different temperatures. The results show that Ag nanoparticles were obviously formed on the nanofibers after annealing at 700℃, showing the highest SERS performance. This is because when the irradiation of incident light causes the surface plasma resonance on the metal surface and forms a highly enhanced near-field, leading to the enchantment of Raman scattering intensity by times of tens to hundreds. Since its SERS intensity and concentration exhibits a linear relationship, it can be used to determine the measuring concentration. We also find that the resulting SERS-active substrates are uniform and can be reused after being washed only by deionized water. Finally, we further twist nanofibers to form the helical structure with high mechanical strength. It not only reduces the distance between Ag nanoparticles to enhance the SERS performance, but also increases their mechanical strength to be widely applied for more applications.

摘要 ........................................................................................................ i
Abstract ................................................................................................ ii
誌謝 ...................................................................................................... iii
目錄 ...................................................................................................... iv
圖目錄 ................................................................................................. vii
第一章 文獻回顧 ................................................................................. 1
1 鈦酸鈷材料介紹 ..................................................................................... 1
1.1 材料特性 ........................................................................................ 1
1.2 製備方法 ........................................................................................ 2
2 拉曼散射 .................................................................................................. 3
2.1 拉曼散射發展歷史 ........................................................................ 3
2.2 拉曼散射原理 ................................................................................ 4
3 表面增強拉曼散射 .................................................................................. 6
3.1 表面增強拉曼散射歷史 ................................................................ 7
3.2 表面增強拉曼散射原理 ................................................................ 7
4 表面電漿共振 .......................................................................................... 9
4.1 傳播式表面電漿共振 .................................................................. 10
4.2 侷域化表面電漿共振 .................................................................. 11
4.3 奈米奈米粒子的組合 .................................................................. 11
4.4 奈米銀之優勢 .............................................................................. 12
4.5 介電常數之影響 .......................................................................... 14
5 研究動機 ................................................................................................ 16
第二章 實驗方法 ............................................................................... 17
1 實驗流程 ................................................................................................ 17
2 實驗藥品 ................................................................................................ 18
3 實驗儀器 ................................................................................................ 19
3.1 靜電紡絲實驗機 (Nanofiber Electrospinning Unit)................... 19
3.2 三區管型爐 (Tube Furnaces) ...................................................... 21
3.3 掃描式電子顯微鏡 (Scanning Electron Microscopy) ................ 21
3.4 X光粉末繞射儀 (X-ray Diffraction) .......................................... 22
3.5 穿透式電子顯微鏡 (Transmission Electron Microscopy) ......... 23
3.6 顯微拉曼光譜儀 (Micro-Raman Spectrometer) ........................ 24
4 實驗步驟 ................................................................................................ 25
4.1 製備金屬鹽類前驅溶液 .............................................................. 25
4.2 靜電紡絲製備奈米纖維 .............................................................. 25
4.3 退火熱處理 .................................................................................. 26
4.4 表面增強拉曼基板量測 .............................................................. 26
第三章 實驗結果與討論 ................................................................... 27
1 SEM表面形貌分析 ............................................................................... 28
2 XRD粉末相鑑定分析 ........................................................................... 30
3 TEM微結構分析 ................................................................................... 32
4 SERS強度分析 ...................................................................................... 36
5 螺旋結構 ................................................................................................ 43
第四章 結論 ....................................................................................... 46
第五章 未來展望 ............................................................................... 47 參考文獻 ............................................................................................. 48
                                

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