Mass-Based Photothermal Comparison Among Gold Nanocrystals,
PbS Nanocrystals, Organic Dyes, and Carbon Black
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Abstract
Gold nanocrystals have attractive plasmon-enabled photothermal
conversion properties, which have been widely employed for photothermal
therapy and solar energy harvesting. For practical applications, the
mass-normalized photothermal conversion performance is often desired
to be known for Au nanocrystals with different shapes and sizes and
for different nanomaterials. We study the photothermal conversion
performances of differently shaped and sized Au nanocrystals and compare
them with those of PbS nanocrystals, carbon black, and organic dyes
at the same mass concentrations. Both the mass-normalized extinction
cross section and the photothermal conversion efficiency of Au nanocrystals
decrease as their size is increased. The photothermal conversion performance
of carbon black is comparable to that of relatively small Au nanocrystals,
while the photothermal conversion performance of organic dyes and
PbS nanocrystals is inferior to that of Au nanocrystals. Our results
are useful for the design of Au nanocrystals and the choice of nanomaterials
for photothermal applications