金银铜复合纳米线阵列的制备及其SERS效应研究

Preparation of AuAgCu Composite Nanowire Arrays and the Stody of Their SERS Effects

传统的拉曼增强基底均匀性差,排列无序等缺点限制了表面增强拉曼散射的广泛应用,文中选取Rb_4Cu_(16)Cl_(13)I_7快离子导体薄膜,在4μA外加直流电场作用下,利用固态离子学方法和真空热蒸镀法,制备了厘米级金银铜复合纳米线阵列.利用扫描电子显微镜(SEM)观测金银铜复合纳米线阵列的表面形貌,利用能量色散光谱仪(EDS)测量金银铜复合纳米线的化学成分,并选取罗丹明6G水溶液作为检测拉曼增强性能的探针分子,利用拉曼光谱仪测量金银铜复合纳米线基底的拉曼增强能力.结果表明:制备的金银铜复合纳米结构呈竹节状生长,微观形貌具有长程有序和短程有序结构,纳米线直径分布范围为45～95nm;纳米线表面均匀分布着直径为?20nm左右的纳米颗粒,从而使得其表面具有很高的粗糙度;纳米线中金银铜的近似摩尔比为2∶3∶15;制备的金银铜复合纳米线阵列作为表面增强拉曼散射基底测量罗丹明6G溶液的极限浓度是10^(-14) mol·L^(-1).

Traditional Raman enhanced substrates have the disadvantages of low uniformity and disordered arrangement,which have limited the wide application of the surface enhanced Raman scattering.Centimetre sized AuAgCu composite nanowire arrays were prepared by the solid state ionics method and vacuum thermal evaporation method in a 4 μA direct current electric field using fast ionic conductor Rb 4Cu 16 Cl 13 I 7 film.The surface morphology and chemical composition of the AuAgCu composite nanowire arrays were characterized by a scanning electron microscopy （SEM） and an energy dispersive spectrometer （EDS）,respectively.Rhodamine 6G （R6G） aqueous solutions were used as probe molecules to test Raman enhancement performance of the AuAgCu composite nanowires substrates with a Raman spectrometer.The results show that the micromorphology of the prepared AuAgCu composite nanowires with long range and short range orderly arrangement are bamboo shaped and the diameters of nanowires ranged from 45 to 95 nm,the prepared nanowires are of high surface roughness because on the surface uniformly distribute nanoparticles with a diameter of about 20 nm.The approximate molar ratio of Au∶Ag∶Cu in the composite nanowires is 2∶3∶15.With the prepared AuAgCu composite nanowire arrays as the SERS substrates,the limiting concentration of R6G is 10 -14 mol·L^ -1 .