la0c00152_si_001.pdf (2.16 MB)
Highly Correlated Size and Composition of Pt/Au Alloy Nanoparticles via Magnetron Sputtering onto Liquid
journal contribution
posted on 2020-03-19, 16:05 authored by Lianlian Deng, Mai Thanh Nguyen, Jingming Shi, Yuen-ting Rachel Chau, Tomoharu Tokunaga, Masaki Kudo, Syo Matsumura, Naoyuki Hashimoto, Tetsu YonezawaPt/Au
alloy nanoparticles (NPs) in a wide composition range have
been synthesized by room-temperature simultaneous sputter deposition
from two independent magnetron sources onto liquid PEG (MW = 600).
The prepared NPs were alloyed with the face-centered cubic (fcc) structure.
In addition, the particle sizes, composition, and shape are strongly
correlated but can be tailored by an appropriate variation of the
sputtering parameters. No individual particle but large agglomerates
with partial alloy structure formed at Pt content of less than 16
atom %. Highly dispersed NPs with no agglomeration were observed in
PEG when the quantity of Pt is more than 26 atom %. On the other hand,
a small amount of Pt could terminate the agglomeration of Au when
sputtering on the grids for transmission electron microscope observation.
Our experiment and computer simulation carried out by two different
methods indicate that the composition-dependent particle size of Pt/Au
can be explained by the atomic concentration, formation energy of
the cluster, and interaction between different metal atoms and the
PEG molecule.