Artículo
Refractive Index versus Coupling Effects for Naked and Surfactant-Coated Au Nanoparticle Films: Implications for Selective Detection of Vapor-Liquid Analytes
Dalfovo, Maria Celeste
; D'ambrosio, Christian Nahuel
; Muñetón Arboleda, David
; Britto, Fiona Macarena
; Scarbol, Luisina Anabel; Lester, Marcelo Fabian
; Inchaussandague, Marina Elizabeth
; Skigin, Diana Carina
; Ibañez, Francisco Javier
Fecha de publicación:
07/2021
Editorial:
American Chemical Society
Revista:
ACS Applied Nano Materials
ISSN:
2574-0970
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
From a single dispersion of surfactant-coated Au nanoparticles (NPs), we can assemble colorimetric films of different thickness, organic content, and structure. In this work, we demonstrate how these variables play a fundamental role in determining what sensing mechanism predominates when these films are subjected to liquid-phase ethanol (EtOH), acetone (Ace), and toluene (Tol) analytes. Theoretical calculations, performed with the Korringa-Kohn-Rostoker (KKR) model, agree very well with the experiments if we consider that thinner films with lesser organic/inorganic content (or no organic at all) offer more vacancies for the solvents to partition, leading to effective changes in the permittivity. Instead, thicker films with a more compacted structure suffer minimal changes in the effective permittivity (lesser vacancies), causing color changes dominated by changes in the distance between the Au NPs. These films may be incorporated into a sensor array for improving selectivity toward the detection of vapor/liquid-phase analytes.
Palabras clave:
AU NANOPARTICLES
,
COUPLING EFFECTS
,
KKR MODEL
,
PLASMON SHIFT
,
REFRACTIVE INDEX
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Articulos(CIFICEN)
Articulos de CENTRO DE INV. EN FISICA E INGENIERIA DEL CENTRO DE LA PCIA. DE BS. AS.
Articulos de CENTRO DE INV. EN FISICA E INGENIERIA DEL CENTRO DE LA PCIA. DE BS. AS.
Articulos(IFIBA)
Articulos de INST.DE FISICA DE BUENOS AIRES
Articulos de INST.DE FISICA DE BUENOS AIRES
Articulos(INIFTA)
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Dalfovo, Maria Celeste; D'ambrosio, Christian Nahuel; Muñetón Arboleda, David; Britto, Fiona Macarena; Scarbol, Luisina Anabel; et al.; Refractive Index versus Coupling Effects for Naked and Surfactant-Coated Au Nanoparticle Films: Implications for Selective Detection of Vapor-Liquid Analytes; American Chemical Society; ACS Applied Nano Materials; 4; 7; 7-2021; 6786-6795
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