GO/Au/Ag复合材料表面形貌调控及其表面增强拉曼效应

Surface Morphology Control and Surface Enhanced Raman Scattering Effect of GO/Au/Ag Composite

表面增强拉曼散射光谱(SERS)因具有高灵敏及无损检测的特点,在化学检测领域受到广泛关注.采用原位化学还原法,制备氧化石墨烯/金/银(GO/Au/Ag)复合材料,利用扫描电子显微镜(SEM)、X射线能谱仪(EDS)、紫光—可见分光光度计(UV)等手段对复合材料结构进行表征,并深入研究不同Au/Ag比例对纳米复合材料形貌和SERS的影响.以罗丹明6G(R6G)为探针分子,研究纳米复合材料的形态对表面增强拉曼散射的影响.研究结果表明GO/Au/Ag复合材料具有良好的SERS增强效果,且SERS信号强度与样品表面形貌以及Au、Ag含量(质量分数,全文同)有关.Au/Ag纳米颗粒表面粗糙度以及Au、Ag含量的提高可以显著增加GO/Au/Ag复合材料的SERS效果.

Surface enhanced Raman scattering(SERS)has attracted much attentions in the field of chemical detection because of its high sensitivity and nondestructive detection.Graphene oxide/Au/Ag(GO/Au/Ag)composites were prepared by in-situ chemical reduction method.Scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDS)and Ultraviolet-visible spctrophotometer(UV)were used to characterize the structure of the composites,and the effect of Au/Ag ratio on the morphology and SERS of composites were strudied.Rhodamine 6G(R6G)was used as the probe molecule to study the influence of composites morpfology on surface enhanced SERS.The result show that GO/Au/Ag composites have good SERS enhanced effect,and the SERS signal intensity is related to the surface morphology and the content(mass fraction)of Au and Ag.The increase of surface roughness of Au/Ag particles and the content of Au and Ag could significantly increased the SERS effect of GO/Au/Ag composites.