2 research outputs found
Preparation and Perfomance of an Aging-Resistant Nanocomposite Film of Binary Natural Polymer–Graphene Oxide
As
one of the materials having a bionic structure, nacrelike layered
composites, inspired by their natural hybrid structures, have been
studied via a variety of approaches. Graphene oxide (GO), which differed
from inert graphene, was used as a new building block because it could
be readily chemically functionalized. Rather than natural polymers,
synthetic polymers were most commonly used to fabricate nacrelike
GO–polymer materials. However, naturally occurring polymers
complied more easily with the requirements of biocompatibility, biodegradability,
and nontoxicity. Here, a simple solution-casting method was used to
mimic natural nacre and fabricate a self-assembled and aging-resistant
binary natural polymer, (κ-carrageenan (κ-CAR)–Konjac
glucomannan (KGM))–GO nanocomposites, with varying GO concentrations.
The investigation results revealed that κ-CAR–KGM and
GO mostly self-assemble via the formation of intermolecular hydrogen
bonds to form a well-defined layered structure. The mechanical properties
of the natural polymer–GO films were improved significantly
compared to those of pure natural polymer films. With the addition
of 7.5 wt % GO, the tensile strength (TS) and Young’s modulus
were found to increase by 129.5 and 491.5%, respectively. In addition,
the composite films demonstrated high reliability and aging resistance
as well as a definite TS after cold and hot shock and ozone aging
tests, especially showing a superior ozone resistance. The composite
films can potentially be used as biomaterials or packing materials
Plasmonic Coupling Effect in Silver Spongelike Networks Nanoantenna for Large Increases of Surface Enhanced Raman Scattering
The electric field enhancement of
the silver spongelike networks
has been described to be a systematic investigation by using three-dimensional
finite-difference time-domain (3D-FDTD) simulation. Surface enhanced
Raman scattering (SERS) measurements have indicated that the junction
regions, the hollow nanostructured, and the sharp nanotips of the
broken ligaments in the silver spongelike networks act as electromagnetic
“hot-spots”. The 3D-FDTD calculations have indicated
that the silver spongelike networks may exhibit a high quality SERS
characteristic because of the Ag chain length, chain diameters, chains
gap, chains angle, and sharp nanotips. A maximum enhancement factor
of 3.5 Ă— 10<sup>12</sup> can be obtained with the silver spongelike
networks. As potential nanoantennas, silver spongelike networks can
offer an effective method to optimize plasmon coupling for synthesizing
devices