Thermal Dynamics of Plasmonic Nanoparticle Composites

Abstract

Thermal response rates of plasmonic nanocomposite materials limit their capacity for adaptive control and scalable implementation. This work examines thermal dynamics in insulating and conductive dielectrics containing two-and three-dimensional disordered distributions of plasmonic gold nanoparticles (AuNP). It is shown that a balance of micro-and macroscale internal and external dissipation rates can model overall thermal dynamics and dissipation rates measured for widely varying composite materials to within a few percent using independent geometric and thermodynamic parameters. The independent estimates are within 2.6% of values measured for isolated colloid AuNP suspensions, between 0.15 to 13.4% for randomly sized AuNP embedded in polymer films, and within 5.4 to 30.0% for AuNP deposited on conductive ceramics. Estimated thermal dynamics for AuNP embedded in thin polymer film are higher than AuNP in fluid or on ceramic substrates. This modeling approach could guide design and deployment of thermally responsive plasmonic energy materials, sensors, and therapeutics for heat-sensitive applications.

Chemically-Controlled Ultrafast Photothermal Response in Plasmonic Nanostructured Assemblies

“…The latter rapidly decay nonradiatively into a nonequilibrium distribution of hot carriers that equilibrate with the colder metal lattice, 26 entailing the heating of the surrounding microenvironment. 27 − 30 Importantly, such a mechanism occurs at an ultrafast rate and generates a strongly localized and finely controllable increase in temperature, which makes plasmonic nanostructures particularly suitable as nanosources for local heating.…”

Initial dynamic thermal dissipation modes enhance heat dissipation in gold nanoparticle–polydimethylsiloxane thin films

“…NPs dispersed in colloidal suspensions of various fluids (i.e., nanofluids) resulted in an increase in the thermal conductivity of the suspension [19], but the thermal response per NP decreased to near zero [20]. Numerical models for estimating and modeling the heat dissipation have also been used to analyze nanofluids used in microchannels [21], while other models utilize the thermodynamic properties to predict the structure of materials [22,23]. Heat exchangers and other thermodynamic components have recently been constructed using NP-containing materials in order to analyze the heat transfer properties of the materials and components [24].…”

Thermoplasmonic dissipation in gold nanoparticle–polyvinylpyrrolidone thin films

“…Gold (Au) NPs dispersed in super-wavelength thick polydimethylsiloxane (PDMS) lms at separations near or greater than localized surface plasmon resonance (LSPR) wavelength absorbed more power as optical extinction increased with AuNP content, and dissipated more heat. 17 Sufficient accrual of heat is reported to reshape NP 18 or melt (evaporate) surrounding solids (liquids). 15,16,19 In contrast, AuNP in water-soluble, subwavelength polyvinylpyrrolidone (PVP) lms at separations less than LSPR wavelength extinguished less power as AuNP content increased.…”