Plasmonic Sensing of Heat Transport at Solid–Liquid Interfaces

Abstract

We report experimental studies of interfacial heat transport for a system of Au nanodisks supported on fused silica substrates, coated by hydrophilic and hydrophobic self-assembled monolayers, and immersed in water−ethanol mixtures and solutions of a nonionic surfactant, hexyl-β-Dglucoside in water. The Au nanodisks are abruptly heated by a subpicosecond optical pulse; time-resolved changes in the temperature of the Au nanodisk and the liquid near the nanodisk/liquid interface are monitored by measurements of transient changes in optical transmission. The interface thermal conductance G of nanodisks coated with a hydrophilic self-assembled monolayer (SAM) of sodium 3-mercapto-1propanesulfonate varies over the range 90 < G < 190 MW m −2 K −1 as the composition of the liquid mixture is changed from pure ethanol to pure water. With increasing hexyl-β-D-glucoside concentration in water, the interface thermal conductance of hydrophilic nanodisks decreases from 190 MW m −2 K −1 to 130 MW m −2 K −1 as the concentration is varied between pure water and 100 mM glucoside. For hydrophobic surfaces, G = 70 ± 10 MW m −2 K −1 . We relate changes in thermal conductance to changes in work of adhesion.

Ultrafast Thermo-Optical Dynamics of a Single Metal Nano-Object

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Thermal conductance between water and nm-thick WS2: extremely localized probing using nanosecond energy transport state-resolved Raman

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Solution‐Processed Large‐Area Gold Nanocheckerboard Metasurfaces on Flexible Plastics for Plasmonic Biomolecular Sensing

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