Biomedical Engineering Reference
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Fig. 8.6
Gold-platinum bimetallic heteronanostructures built by valence-controlled DNA assem-
bly (Reproduced from Ref. [
38
] by permission of The Royal Society of Chemistry)
8.3.4
DNA-Directed Valence-Controllable Assembly
of Heterostructured Nanomaterials
Heteronanostructures are important because of the existence of a physical interface
(junction) between different materials, which are therefore very useful in various
aspects including catalysis, sensors, nanomotor, and electronic and optoelectronic
devices. Developing a strategy for the assembly of heterostructured nanomaterials
with precise structural and compositional controls is important for more realistic
applications of nanomaterials toward enhanced or rationally coupled properties. We
have recently overcome the challenge associated with the gel electrophoresis-based
valence separation of DNA-conjugated platinum nanoparticles (PtNPs) (Fig.
8.6
)
[
38
]. The ability to prepare gold and platinum nanoparticles with well-defined DNA
“bonding” valences allowed us to assemble Au
n
Pt
m
(
n
and
m
denote the exact
numbers of AuNPs and PtNPs) discrete nanostructures including Au
3
Pt
1
,Au
2
Pt
1
,
Au
1
Pt
1
,Au
1
Pt
2
,andAu
1
Pt
3
. Besides the discrete structures, monofunctionalized
DNA-PtNP was useful for a high-yield assembly of cross-link-free core-satellites
with a fully tunable density of PtNPs around a gold core. It is noteworthy
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