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In this study, hyperbranched polyglycerol (HPG) is chemically bound onto carbon fiber (CF) surface by anionic ring-opening polymerization for linking fiber and matrix to release interior and exterior applied forces. To explore the optimal conditions for the successful hyperbranched polymerization of glycidol on the carbon fiber, various characterization techniques were employed. The atomic force microscope...
This work demonstrates the surface chemistry of graphene can be directly reflected by the visible zinc oxide (ZnO) nanostructures. When C/O atom ratio is smaller than 9, ZnO tends to self-assemble into hydrangea-like microstructure in the form of nanosheets on the graphene films and the size of ZnO microspheres decrease gradually with the increase of C/O ratio. In the case of C/O ratio of larger than...
Two kinds of surface-enhanced Raman scattering (SERS) substrates structured with hybrid of Ag nanoparticles (AgNPs) and graphene (GE) were synthesized, namely GE underneath AgNPs (AgNPs-GE) and GE covered AgNPs (GE-AgNPs). They provide a platform to make a comparative study on the optical properties and SERS effects of the hybrid structures as well as on the interactions between AgNPs and GE. The...
In this study, alternate nonmagnetic Al2O3 and magnetic Fe3O4 multilayer nanofilms with precisely controlled thickness were deposited on carbon nanocoils by atomic layer deposition. The as-synthesized composites exhibit superior microwave absorption performance, which can be flexibly tuned by varying the thickness of each individual layer or the number of layers. The excellent absorption performance...
Well-intergrown nanocrystals of zeolitic imidazolate frameworks (ZIF-8) supported on three-dimensional (3D) graphene were prepared by a counter diffusion technique. The incorporation of ZIF-8 crystals greatly improves the surface areas of the graphene composites. The carbonized graphene–ZIF composites with hierarchical pore structures showed high electrochemical capacitance and good stability. This...
Hierarchically porous carbon materials have many important technological applications; however, most of them were fabricated using either expensive materials or complicated procedures. Based on a general chelate-assisted multi-component co-assembly strategy, nitrogen-doped hierarchically porous carbon materials were fabricated by using Al-based composite and commercial triblock copolymer Pluronic...
The effects of humic acid (HA) on copper (Cu(II)) adsorption onto few-layer reduced graphene oxide (FRGO) and few-layer graphene oxide (FGO) were investigated using a batch equilibration method, micro-Fourier transform infrared spectroscopy, and extended X-ray absorption fine structure spectroscopy (EXAFS). The results showed that HA was adsorbed on FRGO through π–π interaction. The adsorbed HA introduced...
Recently, we have developed a catalyst-free and direct growth approach for nanographene on various substrates by a remote-plasma assisted chemical vapor deposition. A two-step growth strategy for separately controlling the nucleation and subsequent edge growth was further developed for growing graphene sheets with adjusted nuclei density and large domain size of 500nm. The key for tuning the growth...
Surfactants are vital for the dispersion and separation of single-walled carbon nanotubes (SWCNTs) when using chromatographic methods. However, excessive surfactant impurities left on the sorted tube surface and in solution may dramatically affect the fabrication and performance of various SWCNT-based thin-film devices. We demonstrated that compared to the widely used anionic surfactants, including...
We report unusual negative thermal expansion and viscoelastic properties in graphene oxide paper. The paper was prepared from aqueous GO dispersions using a simple vacuum evaporation technique. From room temperature to 150°C, this paper-like graphene oxide sheet exhibits a constant negative thermal expansion coefficient of −67×10 −6 /°C along the in-plane direction. Peculiar hysteresis loops...
Binary gradient elution is used for the rapid separation of semiconducting (s-) single-walled carbon nanotubes (SWCNTs) with single or few chiralities using single-column sephacryl gel chromatography. It is found that single-component elution with sodium dodecyl sulphate (SDS) or sodium deoxycholate (DOC) solution at optimum concentrations favors the separation of SWCNTs by electronic type and diameter...
This paper reported the adsorption of cationic–anionic surfactant mixtures, such as octyltriethylammonium bromide/sodium dodecylbenzenesulfonate (OTEAB/SDBS) and dodecylpyridinium chloride/sodium octanesulfonate (DPC/SOS), on activated carbon (AC) in deionized water and in mineralized water systems. The AC surface chemistry was characterized by X-ray photoelectron spectroscopy and ζ-potential determinations...
Fe 7 C 3 nanocrystals encapsulated in carbon nanoparticles, with sizes ranging from 10 to 40 nm, were synthesized via the explosion of a hybrid xerogel containing oxidized pitch and iron nitrate. Explosion of the hybrid xerogel was induced by heat treatment. Transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and extended X-ray...
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