Thermal dynamics of pulsed-laser excited gold nanorods in suspension

Photothermal reactions of metallic nanostructures, such as gold nanorods show appealing structural relaxations, such as bubble formation or particle modification. We have employed a pump-probe method to record the structural relaxations of a suspension of gold nanorods upon femtosecond laser excitat...

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Bibliographic Details
Published in:Nanoscale 2017-11, Vol.9 (44), p.17284-17292
Main Authors: Plech, Anton, Ibrahimkutty, Shyjumon, Reich, Stefan, Newby, Gemma
Format: Article
Language:English
Subjects:
Excitation
Femtosecond pulsed lasers
Fluence
Gold
Lasers
Nanorods
Probe method (forecasting)
X-ray scattering
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Summary:Photothermal reactions of metallic nanostructures, such as gold nanorods show appealing structural relaxations, such as bubble formation or particle modification. We have employed a pump-probe method to record the structural relaxations of a suspension of gold nanorods upon femtosecond laser excitation by pulsed X-ray scattering both with wide-angle and small-angle sensitivity. Single-pulse reactions include transient bubble formation at 20 J m and irreversible nanorod reshaping at 30 J m . Thus the window for reversible excitation is very narrow. Additionally we could map the time-domain and fluence behaviour in a wide range to characterize the relaxations comprehensively. The polarized laser pulse first selectively excites nanorods aligned with the laser electric field, but at higher fluence non-aligned rods are also transformed. At low fluence this transformation happens in the solid state, while at higher fluence the rods melt.
ISSN:2040-3364
2040-3372
DOI:10.1039/c7nr06125k