表面電荷密度對氮化銦鎵表面增強拉曼散射的影響

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姓名

黃政中(Cheng-Chung Huang) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

表面電荷密度對氮化銦鎵表面增強拉曼散射的影響
(The effects of surface charge density on InGaN-based surface-enhanced Raman scattering)

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摘要(中)

在我們生活中，生醫與我們的生活越來越相關，為了保持優良的生活品質，生醫方面知識成為最炙手可熱的研究議題。表面增強拉曼散射(surface-enhanced Raman scattering, SERS)具備高速、高靈敏度、多工的特性，是極具潛力的生醫感測工具。在此論文中，為了增強待測分子的SERS訊號，我們利用有機金屬化學氣相沉積法，在藍寶石基板上成長微米級氮化鎵粗糙表面，再成長氮化銦鎵量子井，以提升磊晶層表面的載子濃度。我們透過磊晶溫度改變磊晶層的表面粗糙度、並利用量子井的數量調整表面電荷密度。我們發現以850 ℃成長磊晶緩衝層，能得到較高的拉曼強度。此外，增加量子井的層數也能有效增加表面電荷密度、及拉曼訊號強度。未來，我們將持續優化磊晶結構、繼續增強拉曼效應。

摘要(英)

Surface-enhanced Raman scattering (SERS) is a promising biosensing tool because of many merits, including high speed, high sensitivity and multiplexing. In this study, in order to enhance the SERS intensity of analytes, we used metal organic chemical vapor deposition (MOCVD) to grow micro-roughened InGaN quantum wells (QWs) on sapphire substrates.In the MOCVD growth, substrate temperature was used to adjust the surface morphology, while quantum well number was employed to control the density of surface charge.We found that the buffer layer grown at the substrate temperature of 850℃ can produce the surface roughness leading to the highest SERS intensity of single-stranded DNA. It is also found that increasing the number of QWs can effectively enhance surface charge density on the SERS substrate. These results demonstrate that the optimized surface roughness and surface charge density can facilitate the SERS process.

關鍵字(中)

★ 表面增強拉曼效應
★ 表面電荷密度
★ 表面型態

關鍵字(英)

★ surface-enhanced Raman scattering
★ surface charge density
★ surface morphology

論文目次

論文摘要--------------I
Abstract-------------II
誌謝------------------III
目錄------------------IV
第一章、緒論
1.1表面增強共振型拉曼散射的源起與發展---------------1
1.2表面電荷密度對於拉曼散射的效應-------------------3
1.3氮化銦鎵量子井應用於表面增強拉曼散射的優勢--------4
1.4研究動機與章節架構------------------------------7
第二章、實驗原理、方法與儀器
2.1 氮化銦鎵量子井的磊晶成長------------------------9
2.2 表面增益拉曼散射原理---------------------------18
2.3拉曼光譜儀-------------------------------------26
2.4 電容電壓量測儀--------------------------------28
第三章、分析與討論
3.1成核層溫度對磊晶層表面型態的影響-----------------29
3.2 量子井結構與表面電荷密度的關係------------------37
3.3拉曼光譜的分析----------------------------------50
第四章、結論與未來發展
4.1 結論------------------------------------------53
4.2 未來展望---------------------------------------54
參考文獻-------------------------------------------55

參考文獻

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指導教授

賴昆佑簡汎清

審核日期

2020-7-24

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