罗丹明6G在多孔硅-银粒子复合基底上的表面增强拉曼散射

Surface-enhanced Raman Scattering of Rhodamine 6G on Porous Silicon-Silver Particle Composites

多孔硅与货币金属(Au、Ag、Cu)的复合材料在表面增强拉曼光谱领域有很大的应用前景。本文采用恒电流电解法分别制备了具有均匀纳米孔洞的低阻多孔硅和具有多层次微纳米结构的高阻多孔硅,并开发了一种将铈掺杂进入银胶体中形成铈掺杂的银纳米粒子的方法。作为固态SERS基底的一种制备方式,将银颗粒在多孔硅表面固定化,获得了具有很强选择性的复合基底。以罗丹明6G(Rhodamine 6G,R6G)作为探针分子的拉曼测试表明:多孔硅-银粒子复合基底对较大拉曼位移的拉曼峰(1590 cm-1)更加敏感,铈掺杂则进一步增强1360 cm^(-1)处的拉曼峰;且复合基底能够检测到10^(-9)mol/L浓度的R6G。

The composite materials of porous silicon(PS)and coin metals(Au,Ag&Cu)show great application prospects in the field of surface enhancement Raman spectroscopy(SERS).Low resistance PS samples with uniform nano-holes and high resistance PS ones with hierarchical micro-and nano-architectures were prepared by constant current electrolysis,and a novel method of doping cerium into silver colloids to form Ce-doped Ag nanoparticles was developed as well.As a common method of solid SERS substrate preparation,silver particles were immobilized on the surface of PS to obtain the composite with strong SERS selectivity.Raman tests using Rhodamine 6G(R6G)as the probe molecule reveal that the PS-silver colloids substrates were more sensitive to Raman peaks with large Raman shifts(1590cm^(-1)),and doping of cerium further enhanced the peak positioned at 1360cm-1 Raman shift.R6G with a concentration of 1.0×10^(-9) M could be detected by as-prepared substrates.