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New polypyrrole (PPy)-graphene sheet nanocomposites have been synthesized after making reduced graphene react with tetrazine derivatives through inverse electron demand Diels–Alder reaction. The modified graphene material contains pyridazine units as demonstrated by X-ray photoelectron spectroscopy. Then this functionalized graphene material was coated on an electrode, and PPy was deposited by electrochemical...
In this paper, we reported the surface modification of multilayer carbon shell-encapsulated gold nanoparticles (Carbon Nanoparticles, or CNPs) via an oxygen plasma treatment approach and their subsequent functionalization with extraneous gold (Au) nanoparticles for Surface-enhanced Raman Scattering (SERS) sensing and DNA immobilization. The oxygen plasma treatment process led to purification of the...
Nitrogen (N)-doped and un-doped MWCNTs grown using a chemical vapor deposition (CVD) process were studied for their surface chemical modification and thermal characteristics. Various surface functional groups developed through acid purification or controlled plasma oxidation of MWCNTs were analyzed using X-ray photoelectron spectroscopy (XPS). High resolution electron microscopy was used to understand...
A method of integrating hybrid thin films of graphene nanosheets (GNSs) and silver nanoparticles (AgNps) by in situ chemical reduction to prepare transparent conductive films (TCFs) is studied. The surface functional groups of graphite oxide (GO) serve as nucleation sites of silver ions for adsorption of AgNps. To fabricate conductive films with high transmittance, polyurethane (PU) nanofibers are...
The pull-out of a carbon nanotube (CNT) from an alumina (α-Al 2 O 3 ) matrix was investigated using molecular mechanics simulations to study the interfacial properties due to van der Waals and electrostatic Coulombic interactions. The pull-out force of the CNT was found to be proportional to its diameter, but independent of its length and alumina grain boundary type. A theory was proposed...
Aggregation and restacking of graphene nanosheets (GNS) can be efficiently inhibited by decorating the silver nanoparticles on the surface of GNS to form GNS/silver (GNS-Ag) composites, which can construct high transparent and electrically conductive thin films. Silver nanoparticles act as a useful nanospacer and conductor, which not only increase the interlayer distance but also improve the electrical...
A remarkable synergetic effect between the multi-graphene platelets (MGPs) and multi-walled carbon nanotubes (MWCNTs) in improving the mechanical properties and thermal conductivity of epoxy composites is demonstrated. Stacking of individual two-dimensional MGPs is effectively inhibited by introducing one-dimensional MWCNTs. Long and tortuous MWCNTs can bridge adjacent MGPs and inhibit their aggregation,...
The clarification of the sliding behavior between nested walls in a multi-walled carbon nanotube (MWCNT) is crucial for its applications in nano-electro-mechanical systems. The pull-out processes of some outer walls against other inner walls in MWCNTs are studied by molecular mechanics simulations to investigate this sliding behavior between nested walls. The pull-out force for both double-walled...
Direct functionalized carbon nanotubes (CNTs) were utilized to form the heat flow network for epoxy composites through covalent integration. A method of preparing a fully heat flow network between benzenetricarboxylic acid grafted multi-walled carbon nanotubes (BTC-MWCNTs) and epoxy matrix is described. A Friedel–Crafts modification was used to functionalize MWCNTs effectively and without damaging...
Extensive numerical simulation and experimental measurements have been conducted to understand the effects of processing parameters and material properties on sensor sensitivity in polymer/carbon nanotube (CNT) composite sensors. The numerical simulation was based on an improved three-dimensional statistical resistor network model incorporating the tunneling effect between the neighbouring nanotubes,...
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