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We have demonstrated facile laser fabrication of high quality graphene-based microsupercapacitors (MSCs) by carbon dioxide (CO2) laser-assisted reduction and successive ultraviolet (UV) pulsed laser direct carving of a graphene oxide (GO) film. Irradiation of GO films by a high power CO2 laser generated high quality laser reduced graphene oxide (LrGO) films with fewer defects (ID/IG = 0.24) and excellent...
Unique-structured (Mn1/3Co2/3)O-carbon nanotubes (MnCoO-CNT) composite microspheres synthesized by one-pot spray pyrolysis were studied as air electrode for lithium–oxygen (Li-O2) batteries. The (Mn1/3Co2/3)O nanocrystals were first introduced as efficient electrocatalysts for oxygen reduction reactions (ORRs) and oxygen evolution reactions (OERs). In addition, the optimum structure of CNT microspheres...
An effective approach is required to improve the spatial resolution and electrical conductivity of printed graphene patterns for advanced graphene-based printed electronics. Here, we describe a simple and effective strategy to fabricate few-micrometer-wide graphene patterns by meniscus-guided printing, using a highly concentrated graphene oxide (GO, 2 wt%) ink. Our approach exploits the rapid solidification...
The electromechanical characteristics of chemical vapor deposited graphene transferred onto a polymeric substrate were investigated by conducting tensile tests in combination with electrical resistance measurement inside a scanning electron microscope. Our results showed that the unique interfacial adhesion character of the graphene/polymer substrate, where the graphene adheres to the substrate by...
Iron sulfide based lithium primary batteries have shown commercial success in the battery market, since then it has been considered as the most promising candidate to substitute commercial carbon-based anodes for rechargeable lithium-ion batteries. Nevertheless, practical implementation of iron sulfide anode in lithium secondary battery is greatly suffered by huge volume expansion during repeated...
SnO2 hollow nanofibers (SnO2 hNFs) are prepared through electrospinning and annealing processes. The polypyrrole layers coated onto the surface of the SnO2 hNFs are annealed in a nitrogen atmosphere. The nitrogen-doped carbon-coated SnO2 hNFs (SnO2/NC hNFs) are composed of SnO2 hNFs with a wall thickness of 60–80 nm and a nitrogen-doped carbon layer ∼10 nm thick. The nitrogen content in the carbon...
In this work, for the first time we fabricated highly self-aligned large-area reduced graphene oxide/poly (vinylidene fluoride-co-hexafluoropropylene) (rLGO/PVDF-HFP) composite films through simple solution casting followed by low temperature chemical reduction process. The resulting free-standing rLGO/PVDF-HFP composite thin film revealed excellent electrical conductivity of ∼3000 S/m and ultrahigh...
Simultaneous reduction and doping of the graphene oxide (GO) is an important issue for low temperature processed flexible electronic devices. A low temperature method for reduction and ambipolar doping has been developed which yield the doped reduced GO with wide range of work function with a mass production using tetra-methyl ammonium hydroxide (TMAH). The doping type of obtained reduced GO is tuned...
Global warming has become a crucial issue and various efforts have been made to mitigate the emission of CO2, the most dominant greenhouse gas. Adsorption is considered a promising technology for CO2 capture, and carbon materials are good candidates for CO2 adsorption. In this study, highly porous carbons were prepared from polyvinylidene fluoride by single-step physical activation under CO2 flow...
A simple supercritical alcohol route was developed to fabricate hydrogen-enriched porous carbon nanosheets (H-PCNs). The as-prepared H-PCNs were tested as an anode active material for sodium ion batteries. Due to the unique hydrogen donation and alkoxylation ability associated with supercritical isopropanol, the hydrogen-to-carbon ratio of H-PCNs was as high as 2.3. The H-PCNs electrode exhibit an...
This study reports a novel approach for chlorine doping of graphene using low-energy plasma in a low damage inductively coupled plasma (ICP) system, which results in significant reduction (∼60%) of the sheet resistance while maintaining high optical transparency. The chemical vapor deposited graphene on Cu (graphene/Cu foil) was directly doped with low-damage chlorine plasma before transferring to...
A simple method based on relative luminance is proposed for the rapid counting of layers in multilayer graphene. The number of graphene layers can be immediately identified by processing the acquired standard RGB images, once the one-time calibration of the entire optical system has been performed. The estimated number of layers was corroborated using the common counting methods of Raman spectroscopy...
In this work, we fabricated reduced large-area graphene oxide (rLGO) with maximum surface area of 1592μm2 through a cost-effective chemical reduction process at low temperature. The product revealed large electrical conductivity of 243±12Scm−1 and thermal conductivity of 1390±65Wm−1K−1, values much superior to those of a conventional reduced small-area graphene oxide (with electrical conductivity...
Fe2O3 nanorod/carbon nanofiber (CNF) composites were prepared by the electrochemical deposition of Fe2O3 on a web of CNFs, which was then used as a free-standing anode. The conductive, three-dimensional structure of the CNF web allowed for the electrodeposition of the Fe2O3 nanorods, while its high conductivity made it possible to use the composite as a free-standing electrode in lithium-ion batteries...
Enhancing the electrical conductivity and reliability of graphene electrodes is critical for the practical realization of graphene-based electronics, since these factors influence the electrical performance of devices. To achieve such improvements in graphene electrodes requires additional processes such as doping and surface treatments, which inevitably complicate device fabrication. Here, we introduce...
The authors studied the CO2 adsorption performances of borane modified graphene-based materials (B-rG-O). B-rG-O powder was fabricated by reacting graphene oxide with a borane–THF adduct and showed good CO2 adsorption capacity (1.82mmol/g at 1atm) and recyclability as determined using a CO2 isotherm and breakthrough experiments respectively. The roles of boron moieties for CO2 adsorption were studied...
We demonstrate a simple and easy technique to reliably count the number of layers in graphenes with stacking faults. Using lasers with wavelengths of 514 and 633nm, the optical transmittances of multilayer graphene with Bernal, rhombohedral and artificial stacking orders were systematically measured depending on the number of layers. It was found that the optical transmittance of the multilayer graphene...
Several studies have focused on synthesizing large-size graphene with an uniform crystal structure. However, graphene synthesized thus far is generally grainy. Grain properties such as size, shape, and crystal orientation are the basis for improving quality. In this study, a nematic liquid crystal is used to observe the several structural properties of graphene synthesized by chemical vapor deposition...
A superhydrophobic surface with stability against moderate drop impact was quickly created with only a candle. There was no further need for any additional solvent, further surface treatment, drying process or post-treatment process. The fabrication is very simple. A surface is coated with a candle paraffin wax and then sooted with a candle flame. The paraffin wax was used to fix the fragile candle...
Transparent film heaters have attracted increasing attention due to their usefulness in a wide range of applications, such as outdoor panel displays, avionic displays, and periscope and vehicle window defrosters. So far, transparent films made of only one kind of conductive nanomaterial have been tried in the fabrication of transparent film heaters. However, since each nanomaterial has its own advantages...
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