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Appl. Sci. 2018, 8(7), 1132;

The Effect of Gold Nanorods Clustering on Near-Infrared Radiation Absorption

School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia
Australian Nuclear Science and Technology Organization (ANSTO), Kirrawee DC, NSW 2234, Australia
Joint Institute for High Temperatures, Krasnokazarmennaya St., 111116 Moscow, Russia
Microdynamic Technologies Laboratory, University of Tyumen, Volodarsky St., 625003 Tyumen, Russia
Author to whom correspondence should be addressed.
Received: 21 May 2018 / Revised: 3 July 2018 / Accepted: 3 July 2018 / Published: 12 July 2018
(This article belongs to the Special Issue Nanofluids and Their Applications)
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In this paper, the plasmonic resonant absorption of gold nanorods (GNRs) and GNR solutions was studied both numerically and experimentally. The heat generation in clustered GNR solutions with various concentrations was measured by exposing them to Near Infrared (NIR) light in experiment. Correspondingly, calculations based on the discrete-dipole approximation (DDA) revealed the same relationship between the maximum absorption efficiency and the nanorod orientation for the incident radiation. Additionally, both the plasmonic wavelength and the maximum absorption efficiency of a single nanorod were found to increase linearly with increasing aspect ratio (for a fixed nanorod volume). The wavelength of the surface plasmonic resonance (SPR) was found to change when the gold nanorods were closely spaced. Specifically, both a shift and a broadening of the resonance peak were attained when the distance between the nanorods was set to about 50 nm or less. The absorbance spectra of suspended nanorods at various volume fractions also showed that the plasmonic wavelength of the nanorods solution was at 780 ± 10 nm, which was in good agreement with the computational predictions for coupled side-by-side nanorods. When heated by NIR light, the rate of increase for both the temperature of solution and the absorbed light diminished when the volume fraction of suspended nanorods reached a value of 1.24×106. This matches with expectations for a partially clustered suspension of nanorods in water. Overall, this study reveals that particle clustering should be considered to accurately gauge the heat generation of the GNR hyperthermia treatments. View Full-Text
Keywords: hyperthermia; gold nanoparticles; near infrared radiation; surface plasmonic resonance; discrete dipole approximation hyperthermia; gold nanoparticles; near infrared radiation; surface plasmonic resonance; discrete dipole approximation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Gu, X.; Timchenko, V.; Heng Yeoh, G.; Dombrovsky, L.; Taylor, R. The Effect of Gold Nanorods Clustering on Near-Infrared Radiation Absorption. Appl. Sci. 2018, 8, 1132.

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