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Size, Shape, and Wavelength Effect on Photothermal Heat Elevation of Gold Nanoparticles: Absorption Coefficient Experimental Measurement
Author(s) -
Diallo Amadou Thierno,
Tlemçani Malika,
Khan Memona,
Spadavecchia Jolanda,
Djaker Nadia
Publication year - 2020
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.202000255
Subject(s) - photothermal therapy , nanoparticle , nanorod , materials science , absorption (acoustics) , colloidal gold , mie scattering , attenuation coefficient , wavelength , nanostructure , absorption cross section , infrared , laser , analytical chemistry (journal) , nanotechnology , optics , optoelectronics , chemistry , cross section (physics) , composite material , chromatography , physics , light scattering , quantum mechanics , scattering
Complex‐shaped nanoparticles as gold nanourchins (GNU) and nanorods (GNR) are very suitable agents in the case of photothermal therapy due to their photon‐heat conversion ability in the red and near‐infrared region (NIR). The quantification in heat generation of complex shaped nanostructures is an important key to predict the therapeutic effect of these nanoparticles. For that, the determination of the nanoparticles absorption cross section (σ Abs ) responsible for the heat generation is one of the important steps before any application. Although it is obvious to determine σ Abs for spheres via Mie's theory, in the case of complex structures like GNU or GNR, this parameter is difficult to model. In this work, a new methodology is used to determine experimentally σ Abs for both GNU and GNR. Experimental measurements of the photothermal properties of 100 nm size GNU and two different sizes of GNRs are studied regarding different parameters such as concentration, laser excitation wavelength, and exposure time. By using the heat transfer theory, the temperature elevation in the nanoparticles solutions is converted to temperature elevation at the nanoparticles surface and σ Abs values are then calculated for both GNU and GNR in the NIR spectral region.