In-situ partial sintering of gold-nanoparticle sheets for SERS applications |
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Authors: | He Jinbo Lin Xiao-Min Divan Ralu Jaeger Heinrich M |
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Affiliation: | James Franck Institute, The University of Chicago, Chicago, IL 60637, USA. |
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Abstract: | A new, versatile substrate design for surface-enhanced Raman spectroscopy (SERS) is introduced that provides better illumination and collection efficiency than other solid substrates. It uses sheets of 5 nm diameter gold nanoparticles that are draped by drying-mediated self-assembly onto 100 nm thick silicon nitride membranes. During laser illumination, partial in-situ sintering of the nanoparticles into larger structures with tiny gaps (≈2 nm) greatly increases the SERS enhancement factor. The detection of 1 pM of p-mercaptoaniline and 1 fg of 2,4-dinitrotoluene is demonstrated. The use of self-assembled nanoparticle sheets furthermore makes it possible to perform SERS detection in situ on top of a probe solution droplet. |
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Keywords: | gold nanoparticles Raman spectroscopy self‐assembly SERS |
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