利用金屬包覆氧化鋅奈米結構製作表面增強拉曼散射軟性基板

Surface Enhanced Raman Scattering Flexible Substrate Using Metal-Coated ZnO Nanostructures

阮氏瓊如(Nguyen Thi Quynh Nhu)

指導教授 ： 蕭桂森

共同指導教授 ： Le Vu Tuan Hung(Le Vu Tuan Hung)

國立暨南國際大學/科技學院/應用材料及光電工程學系/碩士(2019年)

https://doi.org/10.6837/ncnu201900299

摘要

近年來，奈米材料在許多不同的科學和生活領域中已顯示出其優越性和無限的適用性。其中，氧化鋅材料的奈米結構長期的引起了極大的關注。氧化鋅是一種具有線性能帶結構，Eg〜3.2 eV的大帶隙，結合能的自由激發高達60meV，但成本低廉，並且製造並不復雜。由於這些原因，氧化鋅已被研究應用在許多不同領域，例如光電、傳感器、轉換器，生物醫學等。特別是一維的氧化鋅奈米結構，例如奈米棒、奈米線、奈米管應用於SERS（表面增強拉曼光譜）基板時具有高放大倍率的材料。
在本研究中，我們採用了一種方法在ITO塗層基板上合成氧化鋅一維奈米棒陣列，包含ITO-玻璃和ITO-PET。目的是降低成本但仍為有效的方法來完全控制奈米形態的結構。此外，由於奈米尺寸金屬結構的局域表面電漿共振（LSPR）效應，貴金屬奈米顆粒和薄層在奈米棒上的沉積確實改善了SERS中基材的性能。
本實驗主要研究基板對氧化鋅奈米棒陣列形態的影響，以及找到穩定結構和SERS應用的更好條件。之後，用不同濃度的R6G證明了銀薄膜和金奈米顆粒對拉曼信號有增強的作用。SERS基板的最低可檢測濃度為10-9 M，增強因子約為105。 此研究的結果證實，塗覆在氧化鋅奈米棒陣列結構上的金屬是一種有效的SERS材料，並且有望用於未來進一步改善。

關鍵字

氧化鋅奈米棒 ； 銀 ； 金 ； 表面增強拉曼散射 ； 水熱

並列摘要

In recent years, nanomaterials have shown their superiority and infinite applicability to many different fields of science and life. Among them, the nanostructures of zinc oxide materials have long attracted significant attention. Zinc oxide is a semiconductor with a linear energy band structure, a large bandgap of Eg ~ 3.2 eV, a free exciton with a binding energy of up to 60meV, but the cost is inexpensive and the fabrication is not so complicated. For these reasons, ZnO has been studied as well as applied in many different fields such as optoelectronics, sensors, transducers, biomedical sciences, etc. In particular, one-dimensional nanostructures of ZnO such as nanorods, nanowires, nanotubes are known to be promising material with high amplification capacity when applied to SERS substrates (Surface-Enhanced Raman Spectroscopy).
In this research, we ployed a method to synthesize ZnO one-dimensional nanorods array on ITO-coated substrates, including ITO Glass and ITO PET. The aim is to propose a non-expensive yet still an effective approach to the full-controlled morphology nanostructures. Furthermore, the deposition of noble metal nanoparticles and thin layers onto the nanorods does improve the performance of the substrates in SERS thank to the local surface plasmon resonance (LSPR) effect.
The seed layer effect on the morphology of the ZnO nanorods array was investigated to find out better conditions for stable structure as well as the SERS application. Afterward, the role of silver thin film and gold nanoparticles to the Raman’s signal enhancement was proved with the R6G in different concentrations. The lowest detectable concentration with SERS substrate was 10-9 M and the enhanced factor was around 105 approximately. The result of this research confirms the metal coated on the ZnO nanorods array structure is an effective SERS material and is promising for further improvement in the future.

並列關鍵字

ZnO nanorod ； silver ； gold ； SERS ； hydrothermal

參考文獻

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