金核铂壳纳米棒光学特性的研究

摘要

Au@Pt nanodots core nanostructures,prepared by the Au nanorods-mediated growth,shows high surface -en-hanced Raman scattering( SERS)activity. Boosted by the long-range effect of the enhanced electromagnetic( EM)field gen-erated by the Au core,the electromagnetic enhancement can be adjusted by changing the morphy of the nanoparticls. Simula-tions of the electromagnetic enhancement using the finite difference time domain( FDTD)method and taking into account the real shape of Au@Pt nanorods are reported. The results show that the coupling structure can be used for simple,low cost and widely useful SERS substrates.%本研究工作利用金纳米棒作为核壳纳米结构的内核，金纳米棒因其独特的光学性质在受到光激发时会在其表面产生表面等离激元共振，产生强电磁场，同时利用在金核外侧构建疏松的纳米级铂岛状结构，在金棒外侧建立起粗糙表面，增加金棒表面的电磁场耦合，从而增强过渡金属的SERS效应，并应用FDTD数值模拟的方法讨论铂壳层形状变化对其局域表面等离激元特性的影响。