Absorption cross section of gold nanoparticles based on NIR laser heating and thermodynamic calculations.

ABSTRACT: We present a method for measuring the optical absorption cross section ([Formula: see text]) of gold nanoparticles (GNPs) based on optically heating the solution of GNPs with an 808 nm near-infrared (NIR) laser and measuring the temperature increase of the solution. We rely on the theoretical calculations based on the heat diffusion equations and experimental measurements based on the energy balance equations to measure the [Formula: see text] and the temperature distribution of single GNPs. Several morphologies, including gold nanospheres (GNSs), spherical gold nanoparticle conjugate (AuNPC), which are 20 nm GNSs surface-functionalized with an IR 808 dye, gold nanorods (GNRs), and gold nanourchins (GNUs), were studied. The study found that a single 20 nm GNS has the lowest [Formula: see t

SUBMITTER: Alrahili M 

PROVIDER: S-EPMC7606525 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature