The Effect of Gold Nanorods Clustering on Near-Infrared Radiation Absorption
AbstractIn 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
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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.
Gu X, Timchenko V, Heng Yeoh G, Dombrovsky L, Taylor R. The Effect of Gold Nanorods Clustering on Near-Infrared Radiation Absorption. Applied Sciences. 2018; 8(7):1132.Chicago/Turabian Style
Gu, Xi; Timchenko, Victoria; Heng Yeoh, Guan; Dombrovsky, Leonid; Taylor, Robert. 2018. "The Effect of Gold Nanorods Clustering on Near-Infrared Radiation Absorption." Appl. Sci. 8, no. 7: 1132.
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