info:eu-repo/semantics/article
Label-free biosensing based on single gold nanostars as plasmonic transducers
Fecha
2010-11Registro en:
Dondapati, Srujan K.; Sau, Tapan K.; Hrelescu, Calin; Klar, Thomas A.; Stefani, Fernando Daniel; et al.; Label-free biosensing based on single gold nanostars as plasmonic transducers; American Chemical Society; ACS Nano; 4; 11; 11-2010; 6318-6322
1936-0851
CONICET Digital
CONICET
Autor
Dondapati, Srujan K.
Sau, Tapan K.
Hrelescu, Calin
Klar, Thomas A.
Stefani, Fernando Daniel
Feldmann, Jochen
Resumen
Gold nanostars provide high sensitivity for single nanoparticle label-free biosensing. The nanostars present multiple plasmon resonances of which the lower energy ones, corresponding to the nanostar tips and core-tip interactions, are the most sensitive to environmental changes. Streptavidin molecules are detected upon binding to individual, biotin-modified gold nanostars by spectral shifts in the plasmon resonances. Concentrations as low as 0.1 nM produce a shift of the tip related plasmon resonances of about 2.3 nm (5.3 meV).