DataVXACS Applied Nano MaterialsPaper
journal article·2021-07-23

Refractive Index versus Coupling Effects for Naked and Surfactant-Coated Au Nanoparticle Films: Implications for Selective Detection of Vapor–Liquid Analytes

María C. Dalfovo, Christian N. D’Ambrosio, David Muñetón Arboleda, Fiona M. Britto, Luisina Scarbol, Marcelo Lester, Marina Inchaussandague, Diana Skigin, Francisco J. Ibañez

ACS Applied Nano Materials· Volume 4· Issue 7
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Source abstract

Abstract

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.
Source: openalex_inverted_index · Quality: baseline

Research context

Nanomaterials

OpenAlex topics: Gold and Silver Nanoparticles Synthesis and Applications · Biosensors and Analytical Detection · Advanced Chemical Sensor Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Instituto de Investigaciones Fisicoquímicas, Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata—CONICET, Sucursal 4 Casilla de Correo 16, 1900 La Plata, Argentina

Facultad de Ciencias Exactas y Naturales, Departamento de Física, Grupo de Electromagnetismo Aplicado, Universidad de Buenos Aires, 1245 Buenos Aires, Argentina

Instituto de Física de Buenos Aires (IFIBA), CONICET—Universidad de Buenos Aires, 1245 Buenos Aires, Argentina

Instituto de Nanosistemas, Universidad de San Martín, Buenos Aires, Argentina

IFAS (UNCPBA) and CIFICEN (UNCPBA-CICPBA-CONICET), Grupo Óptica de Sólidos—Elfo, Instituto de Física Arroyo Seco, Pinto 399, 7000 Tandil, Argentina

Funding

University of Louisville · Consejo Nacional de Investigaciones Científicas y Técnicas · Universidad Nacional de La Plata · Universidad Nacional del Centro de la Provincia de Buenos Aires · Universidad de Buenos Aires · PICT

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