INIFTA   05425
INSTITUTO DE INVESTIGACIONES FISICO-QUIMICAS TEORICAS Y APLICADAS
Unidad Ejecutora - UE
artículos
Título:
Improved Vapor Selectivity and Stability of Localized Surface Plasmon Resonance with a Surfactant-Coated Au Nanoparticles Film
Autor/es:
MARÍA C. DALFOVO; ROBERTO C. SALVAREZZA; FRANCISCO J. IBAÑEZ
Revista:
ANALYTICAL CHEMISTRY
Editorial:
AMER CHEMICAL SOC
Referencias:
Lugar: Washington; Año: 2012 vol. 8 p. 4389 - 4397
ISSN:
0003-2700
Resumen:
Here, we report the use of tetraoctylammonium bromide(TOABr)-coated Au nanoparticles (NPs) for the optical sensing ofvolatile organic compounds (VOCs). We find that the film respondedselectively to the presence of polar and nonpolar vapors by changes in themaximum wavelength (λmax) toward higher and lower wavelengths,respectively, as determined by UV−visible spectroscopy. We alsoobserved that the organic coating reorganizes when vapors partitioninto the film indicated by FT-IR and the film contracts in the presence ofwater indicated by scanning electron microscopy (SEM). In the presentsensor, the metallic Au core serves as the plasmonic signal while theorganic coating acts as the receptor material providing vapor selectivityand sensor stability. Correlating changes in (λmax) with changes in therefractive index (RI) and nanoparticle-to-nanoparticle separation in the film is important both fundamentally and for improvingselectivity in localized surface plasmon resonance (LSPR) sensors.