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Hexagonal BCN (h-BCN) has been identified as a promising class of electromagnetic wave (EMW) absorption material for critical Mach number aerocraft due to its exceptional thermal and chemical stabilities as well as adjustable dielectric property. Herein, we report a facile precursor synthesis-pyrolysis method to obtain ultra-light h-BCN bulk ceramics and microtubes (MTs) using commercially available...
Liquid metal, such as Ga, has been demonstrated to be a good catalyst to grow uniform graphene at about 1000 °C. However, at reduced temperature, the high surface tension of Ga causes the limited spreading-ability over the supporting substrate, which prevents the formation of large-area graphene. Here we present that the addition of Cu could efficiently decrease the surface tension of Ga, thus achieving...
Three dimensional graphene networks (3DGNs) are promising electrode materials in electrochemical applications because they provide short diffusion pathways for electrolyte ions and fast transport channels for electrons, and act as an ideal scaffold for forming composites with pseudocapacitive materials to obtain a synergistic effect. This review offers an overview of recent advances in the synthesis...
Nitrogen-doped ordered mesoporous carbons (N-OMCs) were prepared via a two-step approach, using resorcinol (R) and formaldehyde (F) as the carbon precursor and dicyandiamide (DCD) as the nitrogen precursor. In this approach, dicyandiamide, formaldehyde and resorcinol were pre-polymerized in the first step using a basic catalyst to produce DCD-RF resol. The DCD-RF resol was mixed with a solution of...
Using a random polymerization process on graphene oxide (GO), graphene oxide grafted with oligomers containing phosphorylcholine moieties (GO-PCn) was synthesized. The synthesis products were characterized by atomic force microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis and X-ray diffraction. The results revealed...
A new two-step method is developed for the synthesis of resorcinol–formaldehyde polymer and carbon with highly ordered mesoporous structures. For this method, resorcinol and formaldehyde is pre-polymerized in the first step under the presence of a basic catalyst to produce resorcinol–formaldehyde resol. Then, the resorcinol–formaldehyde resol is mixed with Pluronic F127 solution followed by the addition...
Transition metal phosphide (Fe 2 P, Co 2 P and Ni 12 P 5 )-doped carbon xerogels were synthesized by a one-pot pyrolysis of the sol–gel polymer of resorcinol and formaldehyde in the presence of metal nitrates and (NH 4 ) 2 HPO 4 . Various techniques, including: X-ray diffraction, N 2 adsorption–desorption, scanning electron microscopy,...
Carbon nanotubes (CNTs) were rendered water-soluble by grafting on phosphoryl choline (PC). The modified CNTs were characterized utilizing Fourier transform infrared spectra, X-ray photoelectron spectra, thermogravimetric analysis, nuclear magnetic resonance, transmission electron microscopy, ultraviolet/visible absorbance spectra and dynamic laser light-scattering. The results show that the target...
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