Authors
Feifei Zhang, Julien Proust, Davy Gérard, Jérôme Plain, Jérôme Martin,
Title
Reduction of Plasmon Damping in Aluminum Nanoparticles with Rapid Thermal Annealing
In
The Journal of Physical Chemistry C
Volume
121
Issue
13
Pages
7429–7434
Publisher
American Chemical Society
Year
2017
Publisher's URL
http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.7b00909
Indexed by
Abstract
Aluminum is now widely regarded as a promising plasmonic material, especially in the ultraviolet spectrum. We propose rapid thermal annealing (RTA) as a simple method to significantly decrease the amount of intrinsic losses in aluminum nanoparticles. We study the structural and optical properties of aluminum nanoparticles before and after RTA at different temperatures. Our results unveil how RTA affects the plasmonic properties of Al nanoparticles through the competition between the reduction of the number of grain boundaries and oxidation. If RTA is performed below a threshold temperature of 400 °C, then oxidation is extremely weak and the plasmonic resonances sustained by Al nanoparticles are blue-shifted with a decrease in their full width at half-maximum. This improvement is due to a diminution of the number of grain boundaries inside the metal core. Hence, RTA appears as a simple, cost-effective, and up-scalable technique to improve the plasmonic properties of aluminum. In contrast, above the threshold temperature, oxidation becomes predominant, resulting in a detrimental effect on the plasmon resonance. This effect should be taken into account in any industrial process involving heated Al nanoparticles.
Affiliations
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