Enhancement of Molecular Fluorescence and Graphene Raman Signal with Ag Nanostructures Using Graphene as Spacer Layer

Enhancement of Molecular Fluorescence and Graphene Raman Signal with Ag Nanostructures Using Graphene as Spacer Layer

林千貴(Chien-Kuei Lin)

指導教授 ： 甘宏志

國立中正大學/理學院/物理學系/碩士(2014年)

摘要

我們在ITO基板上製作銀平台，將單層石墨烯或雙層石墨烯轉印於銀平台之上，並蒸鍍銀粒子在石墨烯上方，使樣品呈Ag-Graphene-Ag Pad三明治結構，本實驗主要以改變石墨烯上的銀膜厚度和樣品是否有經過退火處理，觀察石墨烯的拉曼光譜變化，之後，在樣品上塗佈Cy3螢光分子，做螢光強度量測。

關鍵字

拉曼信號 ； 螢光

並列摘要

We fabricated Ag-graphene-Ag pad sandwich structure for surface enhanced fluorescence and surface enhanced Raman measurement. The bottom layer consists of a Ag Pad on ITO-glass fabricated with electron beam lithography, a single-layer or bilayer graphene is then transferred on to the Ag Pad, and a very thin layer of Ag film (12nm ~ 2nm thick) is deposited on the top of the graphene layer. Half of the samples are annealed in air to allow the top Ag layer to evolve into Ag nanoparticles. We carry out Raman spectroscopy measurement on all samples and found largest enhancement of the graphene Raman signal from the annealed sample with single layer graphene and 12nm thick Ag layer. After coated with Cy3-tage Straptavidine molecules we measure the florescent signal of the Cy3 tags excited by 532nm laser, we found that the annealed sample with 4nm thick Ag layer on top of single graphene layer produces that strongest fluorescent signal.

並列關鍵字

Raman Signal ； Fluorescence

參考文獻

[16] 郭汝汶”奈米銀粒子在石墨烯覆蓋的銀平台之螢光增益,” 中正大學物理 所碩士論文(2013)

[4] 曾賢德”金奈米粒子的表面電漿共振特性:耦合、應用與樣品製作,”物理雙 月刊 32,126-135 (2010)

[1]吳民躍 劉威志 ”表面電漿子理論與模擬,”物理雙月刊 28,486~496(2006)

[2] Shy-Hauh Guo, Dominic G. Britti, Julia J. Heetderks, Hung-Chih Kan,and Raymond J.”Spacer Layer Effect in Fluorescence Enhancement from Silver Nanowires over a Silver Film; Switching of Optimum Polarization Phaneuf,” Nano Lett.9,2666-2670(2009)

[3] K. Lance Kelly, Eduardo Coronado, Lin Lin Zhao, and George C. Schatz*J." The Optical Properties of Metal Nanoparticles: The Influence of Size, Shape, and Dielectric Environment,”Phys.Chem. B, 107,668-677 (2003)