【摘要】 设计合成了一种尺寸可控,且外壳上无“针孔”的核壳钯包金(Au@Pd)纳米粒子,通过改变核的尺寸和外壳的厚度来调控其光学性质,并用TEM、HRTEM、UV-Vis和SERS等手段对其进行了表征.通过研究Au@Pd纳米粒子的SERS活性随Pd壳层厚度变化的规律,发现薄壳Au@Pd纳米粒子远远优于Pd金属本身的SERS活性,其原因主要是内层金核电磁场增强的长程效应.更多还原

【Abstract】 Pinhole-free Au core Pd shell (Au@Pd) nanoparticles with controllable size were synthesized, and theoptical properties of the nanoparticles can be tuned by varying the size of the core and the thickness of the shell.The Au@Pd nanoparticles were characterized with TEM, HRTEM, UV-Vis absorption spectroscopy and SERS.Through a systematic study of the dependence of SERS activity of Au@Pd nanoparticles on the thickness of thePd shell, it was found that the SERS activity of the Au@Pd nanoparticles is much higher than the massive Pd elec-trode roughened using electrochemical method, which is owing to the long-range effect of the enhanced electro-magnetic field of the Au core.更多还原