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Monodisperse Gold Nanorods for High-Pressure Refractive Index Sensing

Abstract: The effects of hydrostatic pressure on the surface plasmon resonances (SPRs) of aqueous dispersions of monodisperse gold nanorods (AuNRs) were determined up to 9 GPa. The ultranarrow longitudinal SPR band of monodisperse AuNRs allows us to monitor a gradual red shift with pressure, which shows abrupt jumps at the liquid to ice phase VI and ice phase VII transitions. Despite solidifying at low pressure (?1.8 GPa), water displays a regime of quasi-hydrostaticity in said phases VI and VII, up to ca. 5 GPa. Above this pressure, nonhydrostatic effects manifest themselves through broadening of the SPR bands, but barely any effect is observed on the position of the surface plasmon mode. The variation in the SPR peak wavelength with pressure allowed us to determine the pressure dependence of the refractive index of water. Unlike Brillouin scattering or interferometric techniques, this plasmon-spectroscopy-based method leads to a more direct determination of the refractive index, which is well described empirically by Murnaghan-type equations in the three explored phases. We report herein the obtained analytical functions providing the pressure dependence of refractive index in the liquid, ice VI, and ice VII phases of water.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Martín-Sánchez C., González-Rubio G., Mulvaney P., Guerrero-Martínez A., Liz-Marzán L., Rodríguez F.,

 Fuente: Journal of Physical Chemistry Letters, iss.10 (2019), p. 71587-1593

 Fecha de publicación: 01/03/2019

Nº de páginas: 7

Tipo de publicación: Artículo de Revista

 DOI: 10.1021/acs.jpclett.9b00636

ISSN: 1948-7185

Proyecto español: MAT2015-69508-P ; MAT2017-86659-R ; MAT2015-71070-REDC

Url de la publicación: https://doi.org/10.1021/acs.jpclett.9b00636

Autores/as

GONZÁLEZ RUBIO, GUILLERMO

MULVANEY, PAUL

GUERRERO MARTÍNEZ, ANDRÉS

LIZ MARZÁN, LUIS M.