Journal article

Monodisperse Gold Nanorods for High-Pressure Refractive Index Sensing

Camino Martin-Sanchez, Guillermo Gonzalez-Rubio, Paul Mulvaney, Andres Guerrero-Martinez, Luis M Liz-Marzan, Fernando Rodriguez

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | AMER CHEMICAL SOC | Published : 2019

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 variati..

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University of Melbourne Researchers

Grants

Awarded by MINECO/FEDER


Awarded by MALTA TEAM/MINECO


Awarded by Australian Research Council


Funding Acknowledgements

Financial support from Projects MAT2015-69508-P, MAT2017-86659-R (MINECO/FEDER), and MAT2015-71070-REDC (MALTA TEAM/MINECO) is acknowledged. P.M. acknowledges support from the Australian Research Council through grant CE170100026. We thank J. A. Barreda-Argueso for technical support in the absorption experiments.