界面自组装的金/氧化石墨烯复合材料的表面增强拉曼散射行为研究

采用Frens法制备金纳米粒子溶胶,通过界面自组装技术在掺磷的非晶碳衬底表面构筑三维的金/氧化石墨烯/金复合结构.以罗丹明B为探针分子,考察金/氧化石墨烯/金复合材料的表面增强拉曼散射活性.结果表明,由于氧化石墨烯的化学增强和金纳米粒子的电磁场增强的协同作用,在该三维复合材料上获得了很强的罗丹明B拉曼信号.所设计的三维金/氧化石墨烯/金复合材料在生物分析、环境监测、疾病防控、食品安全等领域具有潜在的应用价值.

Surface-enhanced Raman scattering of gold/graphene oxide composite materials fabricated by interface self-assembling

The colloidal gold nanoparticles (AuNP) are synthesized by the classic Frens' method, and the sandwich-structured AuNP/graphene oxide/AuNP (AuNP/GO/AuNP) composite materials are constructed on the phosphorus doped diamond-like carbon film by the interface self-assembling. The surface enhanced Raman scattering behaviors of the AuNP/GO/AuNP composites are investigated by using the rhodamine B (RhB) as the probe molecules. Our results indicate that the Raman intensity of RhB obtained from the AuNP/GO/AuNP composites shows a 16.5-fold increase over that from the AuNP monolayer due to the coupled effect of chemical enhancement of GO and localized electromagnetic field enhancement of plasmonic gold. The designed composite materials with metal/GO/metal sandwich configuration exhibit great potential applications in biochemical analysis, environmental monitoring, disease controlling, and food safety.
Keywords： gold/graphene oxide composite materials interface self-assembling surface-enhanced Raman scattering electromagnetic enhancement mechanism