Plasmon Induced Heat Funneling from Au to Cu in the Bimetallic Au@Cu Core-Shell Nanoparticles
The bimetallic nanostructures that mix a plas-monic metal with a transition metal in the form of the core-shell nanoparticles are promising to promote catalytic performance.But it is still unclear how the heat(hot electrons and phonons)transfers on the interface between two metals.We have designed and synthesized Au@Cu bimetallic nanoparticles with Au as core and Cu as shell.By using transient absorp-tion spectroscopy,we find that there are two plasmon induced heat funneling processes from Au core to Cu shell.One is the electron temper-ature equilibrium(electron heat transfer)with equilibration time of～560 fs.The other is the lattice temperature equilibrium(lattice heat transfer)with equilibration time of～13 ps.This plasmon induced heat funneling may be universal in similar bimetallic nanostructures,so our finding could contribute to further understanding the catalytic mechanism of bimetallic plas-monic photothermal catalysis.
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