2 research outputs found
Monodisperse Pattern Nanoalloying for Synergistic Intermetallic Catalysis
Nanoscale alloys attract enormous
research attentions in catalysis,
magnetics, plasmonics and so on. Along with multicomponent synergy,
quantum confinement and extreme large surface area of nanoalloys offer
novel material properties, precisely and broadly tunable with chemical
composition and nanoscale dimension. Despite substantial progress
of nanoalloy synthesis, the randomized positional arrangement and
dimensional/compositional inhomogeneity of nanoalloys remain significant
technological challenges for advanced applications. Here we present
a generalized route to synthesize single-crystalline intermetallic
nanoalloy arrays with dimensional and compositional uniformity via
self-assembly. Specific electrostatic association of multiple ionic
metal complexes within self-assembled nanodomains of block copolymers
generated patterned monodisperse bimetallic/trimetallic nanoalloy
arrays consisting of various elements, including Au, Co, Fe, Pd, and
Pt. The precise controllability of size, composition, and intermetallic
crystalline structure of nanoalloys facilitated tailored synergistic
properties, such as accelerated catalytic growth of vertical carbon
nanotubes from Fe–Co nanoalloy arrays
Self-Assembly-Induced Formation of High-Density Silicon Oxide Memristor Nanostructures on Graphene and Metal Electrodes
We report the direct formation of ordered memristor nanostructures
on metal and graphene electrodes by a block copolymer self-assembly
process. Optimized surface functionalization provides stacking structures
of Si-containing block copolymer thin films to generate uniform memristor
device structures. Both the silicon oxide film and nanodot memristors,
which were formed by the plasma oxidation of the self-assembled block
copolymer thin films, presented unipolar switching behaviors with
appropriate set and reset voltages for resistive memory applications.
This approach offers a very convenient pathway to fabricate ultrahigh-density
resistive memory devices without relying on high-cost lithography
and pattern-transfer processes