Impact of the Interfacial Thermal Conductance on the Thermoplasmonic Response of Metal/Polymer Hybrid Nanoparticles under Nanosecond Pulsed Illumination

Abstract

Janus nanoparticles containing plasmonic materials have attracted great attention in the thermoplasmonic community due to their potential for applications in thermoelectronics or biomedicine. A significant number of thermoplasmonic applications rely on the heating of nanostructures by using pulsed excitation lasers. The heating generated in these nanostructures is often transferred to other regions via material−fluid interfaces. This heat transfer dynamics is controlled by the interfacial thermal conductance. In this work, we investigate the impact of the interfacial thermal conductance on the thermal relaxation of metal−polymer Janus nanoparticles that generate directional heating under pulsed illumination. We show that neglecting the temperature dependence of the thermophysical properties results in an overestimation of the temperature of the nanoparticle. A gold/polymer semishell nanostructure was used as an example not only to illustrate the aforementioned effects but also to show it as a reliable nanoheater candidate for photothermal therapies, capable of offering a remarkable temperature increment and presenting directional heating. The model we developed here can be applied to any type of nanoarquitecture, showing this work as a powerful tool for topics beyond photothermal therapies that can contribute to the development of novel structures able to control heat on the nanoscale.

Regulating nanoscale directional heat transfer with Janus nanoparticles

“…González-Colsa et al has shown a temperature gap of 10 K with a gold/polymer semi-shell nanostructure under pulsed heating, though the temperature gap under steady-state conditions with the semi-shell remains unclear. 36 Drawing parallels with the first type of JNP investigated in our study, we speculate a significantly enhanced directional heating potential for this type of JNP under ultra-fast pulsed heating compared to continuous heating, attributable to similar factors such as thermal confinement. We anticipate that ultra-fast pulsed heating could be an effective method for harnessing directional heating across various types of JNPs.…”

“…34 These asymmetries have been harnessed to regulate the thermal transport around the JNP and lead to directional heating. [34][35][36][37] Directional heating with the rst type of JNPs has enabled novel applications with JNPs, such as thermophoretic nanomotors, 33,35,38 nano tweezers, 39,40 Janus nano pen injection, 41 and energy management. 42 For the second type of JPNs, recent theoretical studies have shown the possibility of directional heating with signicantly smaller (∼5 nm) than the rst type JNPs (50-200 nm), 34 thus promising to open the new size range for potential applications.…”

“…34 These asymmetries have been harnessed to regulate the thermal transport around the JNP and lead to directional heating. 34–37 Directional heating with the first type of JNPs has enabled novel applications with JNPs, such as thermophoretic nanomotors, 33,35,38 nano tweezers, 39,40 Janus nano pen injection, 41 and energy management. 42…”