首页>
外国专利>
ENGINEERED SERS SUBSTRATES EMPLOYING NANOPARTICLE CLUSTER ARRAYS WITH MULTISCALE SIGNAL ENHANCEMENT
ENGINEERED SERS SUBSTRATES EMPLOYING NANOPARTICLE CLUSTER ARRAYS WITH MULTISCALE SIGNAL ENHANCEMENT
展开▼
机译:工程SERS禁止使用具有多尺度信号增强功能的纳米粒子簇阵列
展开▼
页面导航
摘要
著录项
相似文献
摘要
Defined nanoparticle cluster arrays (NCAs) with total lateral dimensions of up to 25.4 μm by 25.4 μm have been fabricated on top of a 10 nm thin gold film using template guided self-assembly. This approach provides precise control of the structural parameters in the arrays allowing a systematic variation of the average number of nanoparticles in the clusters (n) and the edge to edge separation (Λ) between 1n20 and 50 nm≦Λ≦1000 nm, respectively. Investigations of the Rayleigh scattering spectra and surface enhanced Raman scattering (SERS) signal intensities as a function of n and Λ reveal direct near-field coupling between the particles within individual clusters, whose strength increases with the cluster size (n) until it saturates at around n=4. Our analysis shows that strong near-field interactions between individual clusters significantly affects the SERS signal enhancement for edge-to-edge separations Λ200 nm. The observed dependencies of the Raman signals on n and Λ indicate that NCAs support a multiscale signal enhancement which originates from simultaneous inter- and intra-cluster coupling and |E|-field enhancement. The NCAs provide strong SERS signals of bacterial cells thus enabling a rapid and reliable spectral identification of bacteria.
展开▼