cm0c01090_si_001.pdf (2.12 MB)
pH Regulated Synthesis of Monodisperse Penta-Twinned Gold Nanoparticles with High Yield
journal contribution
posted on 2020-05-22, 19:45 authored by Xing Zhang, Reese Gallagher, Dong He, Gang ChenMaking different
types of nanoparticles (NPs) in the same system
is important not only for simplifying the synthesis but for reaching
a universal growth mechanism and improving reproducibility. Here we
show that different types of penta-twinned NPs (spheroid, bipyramid,
and decahedron) with adjustable sizes can be prepared in one system
with high purity by simply varying the initial pH of the growth solution.
The generality of this method has been demonstrated with a variety
of enols as a reductant, including ascorbic acid. The effect of pH
was mainly attributed to the regulation of the reduction potential
of reductants (RPRs), which determines the atomic deposition preference
on the penta-twinned seed surface due to the lattice strain energy
at the twin boundary and then the way it grows into final products.
This method of controlling the atomic deposition by regulating the
RPRs could be useful for the synthesis of other nanoparticles through
the seed-mediated method.