Journal
NANO LETTERS
Volume 15, Issue 5, Pages 3507-3511Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00872
Keywords
Nanoparticles; localized surface plasmon; biosensing; single-molecule
Categories
Funding
- Netherlands Organisation for Scientific Research (NWO)
- Netherlands 3TU Federation
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We present a plasmonic biosensor based on hundreds of individual gold nanorods with single-molecule sensitivity that are simultaneously monitored in real-time within a dark-field microscopy setup. The approach allows for the statistical analysis of single-molecule interactions without requiring any labeling of the analyte. We study an antibody-antigen interaction and find that the waiting-time distribution is concentration-dependent and obeys Poisson statistics. The ability to probe hundreds of nanoparticles simultaneously will provide a sensor with a dynamic range of 7 decades in concentration and will enable the study of heterogeneity in molecular interactions.
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