College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China.
J Colloid Interface Sci. 2011 Dec 1;364(1):100-6. doi: 10.1016/j.jcis.2011.08.018. Epub 2011 Aug 16.
Dendritic and porous Ag-Pd alloy nanostructures were successfully fabricated on the surface of silicon substrate using the co-reduction method and galvanic replacement reaction, respectively. The molar compositions of Ag and Pd in the alloy could be modulated by controlling the molar ratios of metal precursors and reaction time. The Ag-Pd alloy nanostructures were characterized by transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray (EDX), and X-ray diffraction (XRD). The morphology and phase of Au-Pd alloy nanostructures were discussed as a function of molar ratios of metal precursors and reaction time. In addition, the morphology and composition-dependent surface-enhanced Raman scattering (SERS) of the as-synthesized Ag-Pd alloy nanostructures were investigated. The SERS enhancement factor was estimated and SERS mapping was performed to prove the homogeneity of these substrates. The results indicate that as-synthesized dendritic and porous Ag-Pd alloy nanostructures are good candidates for SERS spectroscopy.
采用共还原法和电置换反应，成功地在硅衬底表面制备了树枝状和多孔 Ag-Pd 合金纳米结构。通过控制金属前驱体的摩尔比和反应时间，可以调节合金中 Ag 和 Pd 的摩尔组成。Ag-Pd 合金纳米结构的特征通过透射电子显微镜（TEM）、高分辨率透射电子显微镜（HRTEM）、场发射扫描电子显微镜（FESEM）、能谱（EDX）和 X 射线衍射（XRD）进行了表征。讨论了 Au-Pd 合金纳米结构的形态和相作为金属前驱体摩尔比和反应时间的函数。此外，还研究了所合成的 Ag-Pd 合金纳米结构的形态和组成依赖性的表面增强拉曼散射（SERS）。估计了 SERS 增强因子，并进行了 SERS 映射以证明这些衬底的均匀性。结果表明，所合成的树枝状和多孔 Ag-Pd 合金纳米结构是表面增强拉曼光谱的良好候选材料。
