Inducing dynamic strain in gold nanoparticle-supported graphene by focused laser irradiation
What is it about?
We have shown a method for the preparation of hemispherical gold nanoparticles by local annealing of gold thin films using focused laser beam. The method resulted in a patterned surface, with closely spaced nanoparticles formed at arbitrarily chosen microscale areas. Graphene grown by chemical vapour deposition was transferred onto the prepared nanoparticles. We have shown that laser irradiation induced strain in the nanoparticle-supported graphene, which turned out to be completely reversible.
Why is it important?
We showed that – while similar laser irradiation induced increased doping and damage in SiO2/Si supported graphene – no change in doping or defect concentration was observed on gold nanoparticle supported graphene, even after several irradiation cycles. Our findings can gain importance in local-heat assisted applications like plasmonic sensors, spasers, or photothermal therapy with nanoparticles or graphene/nanoparticle hybrids.
The following have contributed to this page: Dr. Zoltán Osváth
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