Abstract
Photothermal (PT) efficacy and damage thresholds of gold nanoparticles (NP)—spheres,rods and silica–gold shells—were experimentally studied during their excitation withnanosecond laser pulses at the fluence levels at and above the NP damage threshold. Themaxima of PT efficacy of gold NPs with near-infrared (NIR) plasmon resonances (goldrods and shells) and the minima of their damage thresholds were found to beshifted from their plasmon resonance NIR wavelengths into non-resonant visiblewavelengths. This suppression of PT efficacy of NIR plasmon resonances (bleaching)was found to be up to 18 times for the rods and up to 22 times for the shells.During laser-induced deterioration the NPs maintained their PT properties atleast within 40–150 ns after exposure to laser pulses. PT properties of the goldNPs can be enhanced with the pulse train mode within the above time. The PTbubbles generated around superheated NPs were used as their optical markersand allowed us to quantify PT efficacy of plasmon resonance through the bubbleparameters under the conditions when other methods of NP detection are notapplicable.
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