Linglu Yang, Bo Yan, W. Ranjith Premasiri, Lawrence D. Ziegler, Luca Dal Negro and Björn M. Reinhard Engineering Nanoparticle Cluster Arrays for Bacterial Biosensing: The Role of the Building Block in Multiscale SERS Substrates Advanced Functional Materials 20
Nanoparticle cluster arrays (NCAs) are two dimensional photonic plasmonic crystals (see a and b) that sustain electromagnetic interactions on multiple length scales. In this study, NCAs are assembled from different building blocks (40, 60, 80 nm gold spheres and 40/5, 40/10 core-satellite nanostructures, and their SERS performance is evaluated. The 80 nm NCAs lead to the overall highest SERS enhancement and reproducibility both for small molecules and for monolayers of bacteria (c). Effective single cell SERS sensitivity is demonstrated for optimized NCAs.
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