Toward the design of highly stable small colloidal SERS substrates with supramolecular host-guest interactions for ultrasensitive detection
- Fraire, Juan Carlos
- Sueldo Occello, Valeria Noemi
- Allende, Leandro German
- Veglia, Alicia Viviana
- Coronado, Eduardo A.
DOIAbstract
In this work, we report a simple strategy to obtain ultrasensitive SERS nanostructures by self-assembly of Au nanospheres (NSs). This novel protocol allow us to obtain in a reproducible manner Au NS dimers using cucurbit[6]uril (CB[6]) molecules as linkers. The resulting dimers are stable in colloidal dispersion over several days, generating in this way nanostructures with highly reproducible hot spots. This feature is due to the precise subnanometric control of the molecules that generates interparticle distance and, at the same time, of the capability of placing analyte molecules just within these junctions of ultrahigh field enhancement due to the host-guest properties of the CB[6] molecule. The dimer formation is based on the modificati...
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