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Except the tunable photoluminescent property, graphene quantum dots (GQDs) with special structures have also exhibited other novel properties. Herein, GQDs played a novel coreactant role in Ru(bpy)32+/GQDs system to increase the anodic ECL signal of Ru(bpy)32+, which has been testified by ultraviolet, fluorescence, and electrochemiluminescence (ECL) experiments. Based on the coreactant mechanism of...
Uniaxial tensile experiments are conducted on a T700 carbon fiber/epoxy composite along various off-axis angles. Stress–strain curves are measured along with strain fields mapped via synchrotron x-ray digital image correlation, as well as computerized tomography. Elastic modulus and tensile strength decrease with increasing off-axis angles, while fracture strain exhibits a nonmonotonic trend as a...
The Monte Carlo simulation has been applied to discuss the step effect on a zigzag graphene nanoribbon structure in a longitudinal magnetic field. The effects of the singe-ion anisotropies, longitudinal magnetic fields and temperature on the magnetization plateaus have been investigated in detail. Our results show that the number of magnetization plateaus for the system dissatisfy 2S + 1 criterion...
Brazing C/C composites to Nb is often associated with high residual stress in this research, which results in low-strength joints. To overcome this problem, here we report a novel type of three-dimensional graphene-reinforced Cu foam (G-Cu foam) composite fabricated using chemical vapor deposition. This G-Cu foam was used as an interlayer for brazing C/C composite and Nb. Results show that high-quality...
The unprecedentedly-high mechanical strength and the intrinsically lubricating property make graphene an ideal candidate for atomically-thin solid lubricant. Despite its high potential, graphene was often found to get worn in micro- or macroscale friction tests in ambient conditions. To explore the detailed wear process and evaluate its impact on lubricating performance, we performed tribological...
We have synthesized a porous graphite with a high degree of local crystallinity by adding copper powder as a catalyst into the magnesiothermic reduction of CO2. Furthermore, we revealed that the enhanced crystallinity of the carbon cathode catalyst promotes the electrochemical performance of microbial fuel cells under neutral pH conditions, which provides future guidance on the selection of carbon...
Molecular dynamics simulations were employed to investigate water desalination through functionalized nanoporous graphene membranes. Six graphene membranes were considered in which the carbon atoms of the pores were terminated by hydrogen or hydroxyl functional groups. The results demonstrate that water desalination occurs under external pressure and water flux permeating the membranes scales linearly...
Nitrogen-doped carbon quantum dots (N-CQDs)/BiPO4 materials have been prepared through an ionic liquid assisted solvothermal method. After the introduction of N-CQDs, the N-CQDs/BiPO4 materials exhibited the increased photocatalytic activity for the degradation of four kinds of colorless pollutants under UV irradiation, such as antibiotic ciprofloxacin, enrofloxacin, tetracycline and phenol 4-chlorophenol...
We report a facile method to fabricate Bi2MoO6 nanosheet array exposed with {010} facets for the highly improved photoelectrochemical (PEC) property related to water oxidation. The nanosheet array film would provide large surface area, low resistance and exposed oxygen atoms, facilitating the electrons transport and charge separation. More importantly, the optimized Bi2MoO6 nanosheet array yields...
The lithium-sulfur (Li-S) batteries are potential candidates for next-generation power sources with very high-energy-density. The rational integration of three dimensional (3D) carbon skeletons into sulfur cathode is an efficient and effective route to full use of conductive scaffolds with chemical and mechanical stability and ability to accommodate large amount of active materials. Herein, a 3D free-standing...
The elimination of nanoparticles remains the major roadblock to clinical translation. Caramelization reaction is a general type of non-enzymatic browning reactions to food caramels, the products of carbonaceous nanospheres can be considered safe for biological applications. Here, we report a biocompatible caramelized carbonaceous nanospheres supported paramagnetic ultrathin manganese oxide nanosheets...
Over the past decade, reports of graphene-based devices have increased exponentially due to the superior characteristics and unique advantages that graphene introduces. However, the cost-effective growth and patterning of graphene is always a challenge for large-scale graphene-based device applications. Here we report a universal method based on one-step laser scribing technology for quick synthesis...
Fluorescent carbon quantum dots (C-CQDs) with graphitic structure were synthesized by chemical vapor deposition (CVD) for the first time. With this approach, the synthesized C-CQDs exhibit excellent crystaline graphitic nature with an average diameter of 3.5 nm and rich of hydrophobic CH3 terminal groups. Optical band gap of the C-CQDs was determined to be 3.16 eV, whereas low-lying HOMO/LUMO energy...
The efficient fabrication of carbon nanotube (CNT) bundles is the prerequisite for their bulk applications. However, the poor fluidization behavior of metal nanoparticle catalysts hinders the effective growth of high quality CNT bundles. Herein magnetically assisted fluidized bed (MFB) chemical vapor deposition was proposed for bulk growth of long CNT arrays. By introducing a uniform magnetic field...
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