Nanoparticle catalyst
materials are becoming ever more important
in a sustainable future. Specifically, platinum (Pt) nanoparticles
have relevance in catalysis, in particular, fuel cell technologies.
Sputter deposition into liquid substrates has been shown to produce
nanoparticles without the presence of air and other contaminants and
the need for precursors. Here, we produce Pt nanoparticles in three
imidazolium-based ionic liquids and PEG 600. All Pt nanoparticles
are crystalline and around 2 nm in diameter. We show that while temperature
has an effect on particle size for Pt, it is not as great as for other
materials. Sputtering power, time, and postheat treatment all show
slight influence on the particle size, indicating the importance of
temperature during sputtering. The temperature of the liquid substrate
is measured and reaches over 150 °C during deposition which is
found to increase the particle size by less than 20%, which is small
compared to the effect of temperature on Au nanoparticles presented
in the literature. High temperatures during Pt sputtering are beneficial
for increasing Pt nanoparticle size beyond 2 nm. Better temperature
control would allow for more control over the particle size in the
future.
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