Surface Morphology Control and Surface Enhanced Raman Scattering Effect of GO/Au/Ag Composite
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摘要: 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.
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关键词:
- 氧化石墨烯/金/银（GO/Au/Ag） /
- 表面增强拉曼散射 /
- 表面形貌
Abstract: 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. -
图 1 不同HAuCl4/AgNO3比例时GO/Au/Ag复合材料SEM谱图
Figure 1. SEM images of GO/Au/Ag composites with different ratios of HAuCl4/AgNO3
图 2 不同HAuCl4/AgNO3比例时GO/Au/Ag复合材料EDS谱图
Figure 2. EDS spectra of GO/Au/Ag composites with different ratios of HAuCl4/AgNO3:
图 4 以GO/Au/Ag复合材料为基底时R6G的SERS图谱
Figure 4. SERS spectra of R6G with on the substrates GO/Au/Ag composite as the substrates
表 1 GO/Au/Ag复合材料EDS图谱元素含量
Table 1. Element content of GO/Au/Ag composites based on EDS spectra
% 样品 C O Au Ag GO/Au/Ag30:1 52.25 28.59 13.58 5.59 GO/Au/Ag18:1 53.73 30.79 10.64 4.84 GO/Au/Ag15:1 55.26 21.13 11.65 11.97 GO/Au/Ag12:1 33.43 23.46 20.31 22.80 GO/Au/Ag4:1 36.94 26.19 16.69 20.19 GO/Au/Ag6:5 45.13 32.26 5.75 16.87 
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表 2 以GO/Au/Ag复合材料为基底时R6G拉曼位移及EF值
Table 2. Raman shift and EF values of R6G with substrates GO/Au/Ag composites as substrates
样品 拉曼位移 614 cm−1 EF 773 cm−1 EF 1186 cm−1 EF GO/Au/Ag30∶1 −4 0.70×104 −1 0.21×104 −4 0.21×104 GO/Au/Ag18∶1 −4 2.57×104 −1 0.85×104 −4 1.02×104 GO/Au/Ag15∶1 −4 2.60×104 −1 0.96×104 −4 1.47×104 GO/Au/Ag12∶1 −2 6.72×104 −1 2.60×104 −4 3.86×104 GO/Au/Ag4∶1 −4 3.06×104 −1 2.62×104 −4 4.20×104 GO/Au/Ag6∶5 −4 1.12×104 −1 0.44×104 −4 0.37×104
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