Thermoplasmonic dissipation in gold nanoparticle-polyvinylpyrrolidone thin films

• Published in: RSC advances Vol. 7; no. 89; pp. 56463 - 5647
• Main Authors: Howard, Tyler V, Dunklin, Jeremy R, Forcherio, Gregory T, Roper, D. Keith
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 01.01.2017
• Subjects: Adaptive control; Chemical separation; Dipoles; Effective medium theory; Extinction; Finite element method; Gold; Nanoparticles; Optoelectronics; Polyvinylpyrrolidone; Rayleigh scattering; Scattering cross sections; Thin films
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/c7ra03892e

Thermal dissipation of plasmon energy from gold nanoparticles (AuNPs) dispersed in transparent polymers is important to biotherapeutics, optoelectronics, sensing, and chemical separations. This work assessed heat dissipated from power extinguished by 16 nm AuNPs with negligible Rayleigh scattering cross-sections dispersed into subwavelength, 70 nm polyvinylpyrrolidone (PVP) films at interparticle separations much less than the resonant wavelength. In contrast to super-wavelength films with particles at separations near the resonant wavelength, measured optical extinction and temperature increase per NP (°C per NP) decreased as AuNP concentration increased: °C per NP decreased 22% and optical extinction per NP decreased 35% as AuNP concentration increased from 1.01 to 5.06 × 10 15 NP per cm 3 . The trend and magnitude of measured values were consistent with those from a priori description of optical extinction per NP from Maxwell Garnett effective medium theory (EMT) and from coupled dipole approximation (CDA). Optical power extinguished by the films exhibited a trend and magnitude consistent with finite element analysis (FEA) of thermal dissipation from subwavelength films at particle separations of 130 to 76 nm. Comparing measured values with results from EMT, CDA, and FEA distinguished contributions to plasmon-resonant optical extinction and heat dissipation. These results support design and adaptive control of thermal dissipation from plasmonic films. Dissipated heat was consistent with power extinguished by absorbing nanoparticles dispersed into thin polymer films at subwavelength intervals. Measurements mirrored a priori simulation of optical and thermal responses. Components of heating and absorption were identified.