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Photoactivity of graphitic carbon nitride (g-C3N4) is seriously restricted by high recombination rate of photoinduced charge carriers. Herein, a g-C3N4/conjugated polyene (CP) complex is synthesized for the first time via a simple low-temperature calcination process. Lower photoluminescence intensity, longer fluorescence lifetimes, and higher photocurrent density of this complex than those of pure...
In this work a novel method is unfolded to modify carbon felts (CF) to substantially improve the performance of the electrodes for vanadium redox flow batteries (VRFBs). The carbon felt, a well-known electrode material for VRFB, is catalytically etched by cobalt oxide to form carbon nanorods on the surface of the fibers comprising the CF. Unlike conventional multistep processes to grow nano-structures...
Graphene has received great attention owing to its superior physical properties, making graphene suitable for multiple applications. Numerous graphene growth techniques have been developed in the past decade to provide scalable high quality graphene. Among these techniques, chemical vapor deposition (CVD) on catalytic metal films holds great promises for a large-scale graphene growth. Even though...
As semi-metallic monolayer graphene is limited in broadening the applications, synthesis of multi-layer graphene has recently attracted intense interests to enable functional optoelectronic devices. However, controlling the growth of multiple graphene layers is still quite challenging since the process critically depends on self-limited growth and interaction between graphene nucleation and Cu substrate...
A hybrid structure comprising organic dye molecules (e.g., rhodamine 6G) and graphene was developed for the realization of high-performance optoelectronic devices. The fabricated photodetector offered a broad spectral photo-response across wavelengths in the infrared, visible, and ultraviolet regions, as well as a high responsivity (∼460A/W at illumination power of 1μW). The photocurrent generated...
The aqueous extract of Hibiscus sabdariffa L., which is inherently non-toxic, environmentally friendly and cost effective, was used as a green reducing agent to chemically reduce graphene oxide (GO). The GO and reduced graphene oxide by the aqueous extract of Hibiscus sabdariffa L. (HRGO), prepared under different conditions, were characterized. The characterization was conducted to better understand...
Carbon fibers (CFs) were prepared by the plasma-assisted stabilization (PAS) of polyacronitrile (PAN) fibers. PAS was found to be an efficient treatment for stabilizing the precursor fibers in terms of the time, cost and mechanical properties compared to conventional thermal stabilization (CTS). The efficient stabilization of PAN by a radio-frequency capacitive plasma discharge was confirmed using...
The physical properties of carbonaceous aerosol particles are often of interest but are difficult to determine from a single measurement. In this study, we used tandem aerosol measurement techniques to measure the effective physical properties, namely the effective density, porosity, and effective complex refractive index of spheroid aggregated and porous carbonaceous aerosol particles. An in-flight...
Anisotropic electrical conduction measurements have been carried out for thin films of vertically-aligned single-walled carbon nanotubes (VA-SWCNTs) grown by an alcohol catalytic CVD process. Combined with controlled synthesis and structure characterization by optical spectroscopy, the influence of the aligned structure on the electrical conduction has been identified. The out-of-plane conductivity...
The preferred anchoring state for polycyclic aromatic hydrocarbons (PAHs) pyrolyzed onto carbon substrates has been studied by semi-quantitative methods, examining their interfacial lattice arrangements. The samples were prepared by decomposing petroleum pitch inside carbon nanotubes resulting in a variety of crystallinities forming one-dimensional C/C composites. Studies indicate that the preferred...
Carbon nanobelts have been synthesized using nanoporous anodic alumina as template and ethanol as precursor. The length and width are tens of micrometers and 470nm, respectively. The thickness was measured to be 5nm, exhibiting a high-aspect-ratio morphology. After annealing, the crystallinity of the nanobelts can be improved. The formation mechanism of such morphology is demonstrated as a radial...
Si–Cu/carbon composites with a carbon core and a Si–Cu composite shell have been synthesized by two-step mechanical fusion process. Large amount of pores around composite particles as well as the bridging disordered carbon layer between Si–Cu composite and carbon was the structural advantage of Si–Cu/carbon composite, which could prevent the electrochemical degradation induced by enormous volume changes...
Using porous anodic aluminum oxide as template and petroleum pitch as precursor, a massive amount of uniform carbon nanofibers was obtained after thermal treatment. The diameter and length were 300nm and 60μm, respectively. The difference between these and the classic herringbone structure is that the angle between the graphenes and the fiber axis increases regularly along the axis instead of being...
Large-scale production of pure carbon spheres, with diameters from 50nm to 1μm, has been achieved via direct pyrolysis of a wide range of hydrocarbons, including styrene, toluene, benzene, hexane, cyclohexane and ethene, in the absence of catalyst. Specific systematic studies using styrene as the feedstock indicate that the sizes of the resulting of carbon nanospheres can be controlled quite well...
Amorphous carbon films, characterized by XRD, AFM, SEM and Raman, were deposited from SiCl 3 CCl 3 on quartz substrates at 773-1273 K by low pressure chemical vapor deposition using a hot-wall reactor. XPS studies showed that the films grown at 773 K contained 90% C and 10% Cl, while the films grown at 1273 K contained 100% C. SiCl 4 , CCl 4 and Cl 2 C CCl...
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