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以Au粒子(55nm)为核,抗坏血酸为还原剂,将不同量的Pt沉积在Au核上,制得可控壳层厚度(0.3～6nm)的Pt包Au纳米粒子(Aucore@Ptshell).用紫外-可见吸收光谱、扫描电镜(SEM)、透射电镜(TEM)和电化学循环伏安法等观测Aucore@Ptshell纳米粒子的表面形貌、结构和性能.另以SCN-为探针,考察了Pt壳厚度对Aucore@Ptshell纳米粒子SERS信号的影响.结果表明,SCN-离子的SERS信号强度随Pt壳厚度的增加呈指数衰减,当Pt壳厚度为1.4nm时,Aucore@Ptshel纳米粒子表现出铂良好的电化学性能,又具有较强的SERS活性.
Pt Au nanoparticles with controlled thickness of shell (0.3 ~ 6nm) were prepared by depositing Au nanoparticles (55nm) as nucleus and ascorbic acid as reducing agent, and depositing different amounts of Pt on the Au core. UV-visible absorption spectra, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electrochemical cyclic voltammetry were used to observe the surface morphology, structure and properties of Aucore @ Ptshell nanoparticles. Pt shell thickness on the SERS signal of Aucore @ Ptshell nanoparticles.The results showed that the SERS signal intensity of SCN- ions exponentially decayed with the increase of Pt shell thickness, and Aucore @ Ptshel nanoparticles showed an increase of Pt shell thickness of 1.4 nm Platinum good electrochemical properties, but also has a strong SERS activity.