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A supercapacitor is a device which can store electrical energy on conductive materials with a highly porous structure. Carbon-based electrochemical capacitors exhibit fast charge/discharge rate and high power density but limited by low energy density compared with lithium ion batteries. We used the self-assembly method to construct a three-dimensional graphene-based nanoporous carbon derived from...
The structure of onset phase of coal derived natural graphite (CDNG for short), semi-graphite, and CDNG subjected to different metamorphic grade were investigated using XRD, Raman spectroscopy, and HRTEM to trace their structural evolution during graphitization. The transitional phases with different structural order exist in graphite field. A classification of these transitional phases is of particular...
It has been recently demonstrated that moiré pattern formed between graphene and supporting crystalline substrate can modulate atomic friction [1–3] which provides a novel strategy to control friction at the nanoscale. Despite the high potential of this new approach, its underlying mechanism is still unclear. Using molecular dynamics (MD) simulation, we reveal that moiré pattern induced lateral force...
The barium doped fulleride Ba 3 C 60 was treated under high-pressure and high-temperature conditions of 5–15GPa and temperatures up to 1150°C. Amorphous solids stable in air were obtained. The high micro Vickers hardness and the Raman spectra of the solids suggest that the C 60 molecules are collapsed to form amorphous three-dimensional (3D) polymer encapsulating Ba atoms....
We report a generic strategy to make hybrids incorporating metal nanoparticles and carbon nanosupports with large surface area, which is a one-step, universal approach totally free of additives and by-products. Utilizing this approach, we show that small Au, Ag and Pd nanoparticles of uniform size can be self-assembled on diverse carbon nanostructures such as graphene oxide, reduced graphene oxide,...
Development of biocompatible surface coating is critical to engineer various functional nanomaterials for biomedical applications. Here, we present a new surface chemistry of graphene by covalently conjugating graphene oxide (GO) with dextran (DEX), a biocompatible polymer widely used for surface coating of biomaterials. Compared with GO, the graphene–dextran (GO–DEX) conjugate shows reduced sheet...
An easy method is described for fabricating carbon sheets with nanostructures using sucrose as a carbon precursor and a layered superabsorbent polymer (LSAP) as a structure-directing agent. The method is based on the interaction of the three-dimensional polymer networks of the LSAP with a sucrose solution in the hydrogel cells. The synthesis scheme consists of: (a) preparation of the LSAP, (b) preparation...
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