石墨烯於迦凡尼置換法製作表面增強拉曼散射活性複合基材之效應

Effect of Graphene in the Fabrication of SERS Active Hybrid Composites by Galvanic Displacement

劉照恩(Chao-An Liu)

指導教授 ： 黃俊嬴

高雄醫學大學/生命科學院/醫藥暨應用化學系碩士班/碩士(2016年)

摘要

石墨烯是一個單層原子厚的二維碳材料，由於其優異特性，良好的電熱傳導性、高電子傳遞效率、強機械性能等，而被廣泛應用在各個領域。另一方面，表面增強拉曼散射(SERS)具有高靈敏度、低度水分子干擾和豐富的分子訊息，在過去幾十年引起了高度的注意。
在這項研究中，使用迦凡尼置換反應(Galvanic displacement process)將銀奈米粒子(AgNPs)還原在不同材質的金屬基材上，製造出表面增強拉曼活性複合材料，因為銀和不同基底金屬之間有不同的電位差，當銀奈米粒子還原在金屬基材上，所製造出來的銀奈米粒子表面形態也會有所不同，並進一步影響拉曼訊號增強效果。同時，本論文也進行有無石墨烯加入表面增強拉曼複合材料的研究，觀察其兩者的表面形態不同，探討石墨烯在製造複合材料時的影響及石墨烯的效果。其他影響複合材料表面形的參數也包括銀離子的濃度、迦凡尼置換過程的溫度和外加螯合劑，對於上述條件也進行了研究系統，以獲得表面增強拉曼活性複合材料能具有較好的增強效果。

關鍵字

石墨烯 ； 迦凡尼置換 ； 表面增強拉曼散射

並列摘要

Graphene, a two-dimensional carbon material that is only an atom in thickness, has been applied in various fields due to its outstanding characteristics, including excellent electrical and thermal conductivity, high electron transfer efficiency, and strong mechanical properties.
Surface-enhanced Raman scattering (SERS) has attracted increasingly attention in the past few decades due to the high sensitivity, minimum water interference, and abundant molecular information that can be obtained by SERS.
In this study, silver nanoparticles (AgNPs) were reduced on the surfaces of various metals foils via Galvanic displacement in order to fabricate SERS active hybrid composites. Since the cell potentials of silver and various substrate metals are different, various morphologies of AgNPs were formed, and resulted in the difference in the Raman signal enhancement. Meanwhile, the effect of graphene was also studied by comparing the SERS signal and the morphologies of formed AgNPs between the composites in the presence and the absence of graphene to investigate the influence of graphene in the preparation of SERS active hybrid composites.
Other parameters that affect the morphologies of the fabricated composites, including the concentration of Ag+, the temperature of the Galvanic displacement process, and the addition of the chelating agents, were also studied systematically to obtain the SERS active hybrid composites with improved SERS enhancement.

並列關鍵字

Graphene ； Galvanic displacement ； SERS

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