Electroactive polymers are a new generation of "green" cathode materials for rechargeable lithium batteries. We have developed nanocomposites combining graphene with two promising polymer materials, poly(anthraquinonyl sulfide) and polyimide, to improve their high-rate performance. The polymer-graphene were synthesized through simple in situ polymerization the presence sheets. highly dispersed sheets nanocomposite drastically enhanced electronic conductivity allowed electrochemical activity...

Electrochemically active LiMnPO(4) nanoplates have been synthesized via a novel, single-step, solid-state reaction in molten hydrocarbon. The olivine-structured with thickness of approximately 50 nm appear porous and were formed as nanocrystals assembled grew into nanorods along the [010] direction (100) plane. After carbon coating, prepared cathode demonstrated flat potential at 4.1 V versus Li specific capacity reaching high 168 mAh/g under galvanostatic charging/discharging mode, an...

Uniform Au−Ag alloy nanoparticles have been synthesized on cellulose nanocrystal (CNXL) by the co-reduction method of corresponding metal ions. CNXL that plays a dual role matrix and stabilizer has used to obtain stable dispersions nanoparticles. The composition indicates quantitative deposit ions surface followed reduction. sizes were controlled in range 3−7 nm capping agent, sodium citrate, their average diameter was increased with an increase Ag content. Aqueous suspensions dried films...

Colloidal carbon spheres have been prepared from aqueous α-, β-, and γ-cyclodextrin (CD) solutions in closed systems under hydrothermal conditions at 160 °C. Both liquid solid-state 13C NMR spectra taken for samples different reaction times used to monitor the dehydration carbonization pathways. CD slowly hydrolyzes glucose forms 5-hydroxymethyl furfural (HMF) followed by into colloidal spheres. The isolated are 70−150 nm diameter, exhibit a core−shell structure, comprised of condensed core...

We have examined amorphous structures of silicon carbide (SiC) using both transmission electron microscopy and a molecular-dynamics approach. Radial distribution functions revealed that SiC contains not only heteronuclear (Si-C) bonds but also homonuclear (Si-Si C-C) bonds. The ratio to was found change upon annealing, suggesting structural relaxation the occurred. Good agreement obtained between simulated experimentally measured radial functions.

Slow heavy ions inevitably produce a significant concentration of defects and lattice disorder in solids during their slowing-down process via ion-solid interactions. For irradiation effects research many industrial applications, atomic defect production, ion range, doping are commonly estimated by the stopping range matter (SRIM) code. In this study, ion-induced damage projectile ranges low energy Au SiC determined using complementary beam microscopy techniques. Considerable errors both...

Abstract A facile, reliable, and robust synthetic method to prepare high‐quality Pt 3 Fe nanocubes is reported. Results of investigation on these in shape‐/size‐distribution, crystallinity, structural characteristics, compositions, electrochemical activity towards small organic molecule oxidation as well capability assembling into simple cubic supercrystals are presented, a possible formation mechanism the nanocrystals at high temperature oleylamine/oleic acid solution also proposed. This...

This report shows that the size, shape, and composition of presynthesized copper nanoparticles can be nanoengineered through exploiting concurrent interparticle aggregative growth interfacial carbon−sulfur cleavage in a thermally activated evolution route. is demonstrated by processing ultrafine nanoclusters encapsulated with thiolate monolayer (Cun(SR)m) toward semiconducting sulfide (Cu2S) nanodiscs controllable sizes shapes. Under controlled temperatures (120−150 °C), Cun(SR)m...

Nanostructured materials are generally believed to be more radiation resistant. This study reports on Au-ion-induced amorphization in nanocrystalline $3C\text{-SiC}$, characterized using x-ray diffraction, transmission electron microscopy and Raman spectroscopy. Full at room temperature occurs a comparable dose that for bulk SiC single crystals. The behavior is primarily attributed high ion flux sluggish migration of point defects produced during irradiation. results may have significant...

We investigated the radial mechanical properties of multi-walled boron nitride nanotubes (MW-BNNTs) using atomic force microscopy. The employed MW-BNNTs were synthesized pressurized vapor/condenser (PVC) methods and dispersed in aqueous solution ultrasonication with aid ionic surfactants. Our nanomechanical measurements reveal elastic deformational behaviors individual BNNTs two to four tube walls their transverse directions. Their effective moduli obtained through interpreting measured...

Abstract The radial mechanical properties of single‐walled boron nitride nanotubes (SW‐BNNTs) are investigated by atomic force microscopy. Nanomechanical measurements reveal the deformation individual SW‐BNNTs in both elastic and plastic regimes. measured effective moduli found to follow a decreasing trend with an increase tube diameter, ranging from 40.78 1.85 GPa for diameters 0.58 2.38 nm. results show that have relatively lower than carbon (SWCNTs). axially strong, but radially supple...

This report describes a characterization study of the surfaces CsPbBr3 and CsPbBr3–xIx perovskite nanoparticles (NPs) obtained via simultaneous purification halide exchange (HE) postsynthetic processing technique. We studied composition-dependent NP-ligand interactions diffusion ordered NMR (DOSY) quantified resulting photoluminescence quantum yield (QY) as function well ligand exchange. Importantly, binding strength QY were found to decrease when successive and/or halide/ligand steps taken...

Electron-beam induced recrystallization of irradiation-induced amorphous Sr2Nd8(SiO4)6O2 is investigated in situ using transmission electron microscopy with 200keV electrons at room temperature. Epitaxial observed from both the amorphous/crystalline interface and surface, more pronounced increasing electron-beam flux. Since temperature increase by irradiation estimated to be less than 7K maximum energies transferred target atoms are below displacement energies, ionization-induced processes...

We report a novel core−shell-structured ternary nanocube of MnZn ferrite synthesized by controlling the reaction temperature and composition in absence conventionally used reducing agents. The highly monodispersed core−shell structure consists an Fe3O4 core Ferrite shell. observation Moiré pattern indicates that shell are two crystalline materials with slightly different lattice constants rotated relative to each other small angle. nanocubes display magnetic properties regulated combination...

This report demonstrates a novel strategy of chromium-assisted synthesis platinum nanocubes as electrocatalysts for oxygen reduction reaction with enhanced specific activity.

Using an in situ synchrotron X-ray diffraction technique, a pressure-induced phase transformation of PbTe nanocrystals with sizes 13 and 5 nm up to ∼20 GPa was studied. Upon increase pressure, we observed that the start from rocksalt structure intermediate orthorhombic finally CsCl-type at 8 GPa, which is 2 higher than bulk PbTe. In contrast, do not display same type transition further increased pressure as expected. Instead or structure, turn amorphous under similar (8 GPa). release...

We performed electron irradiation into silicon carbide (SiC) using a transmission microscope equipped with field-emission gun. It was found that crystalline-to-amorphous phase transformation takes place 200-keV electrons at room temperature. The incident energies are much larger than the threshold displacement energy of carbon atoms, while it is almost same as or smaller atoms. An amorphized area undergoes from amorphous SiC to because exclusive displacements atoms rather by low...

Relationships between chemical short-range order and volume swelling of amorphous silicon carbide (SiC) under radiation environments have been examined using energy-filtering transmission electron microscopy in combination with imaging plate techniques. Single crystals $4\mathrm{H}\mathrm{Si}\mathrm{C}$ (0001) orientation were irradiated $300\phantom{\rule{0.3em}{0ex}}\mathrm{keV}$ xenon ions to a fluence ${10}^{15}\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}2}$ at cryogenic...

Thermally induced structural relaxation in amorphous silicon carbide (SiC) has been examined by means of situ transmission electron microscopy (TEM). The SiC was prepared high-energy ion beam irradiation into a single crystalline 4H-SiC substrate. Cross-sectional TEM observations and energy-loss spectroscopy measurements revealed that thermal annealing induces remarkable volume reduction, so-called densification, SiC. From radial distribution function analyses using diffraction, notable...

We have investigated the effect of radiation damage and impurity concentration on solid phase epitaxial growth amorphous silicon carbide (SiC) as well microstructures recrystallized layer using transmission electron microscopy. Single crystals 6H-SiC with (0001) orientation were irradiated 150keV Xe ions to fluences 1015 1016∕cm2, followed by annealing at 890°C. Full recrystallization took place in a specimen implanted ions, while retardation was observed 1016∕cm2 ions. Atomic...