The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We study single-walled carbon nanotube (SWCNT) growth from Pt catalysts by a cold-wall chemical vapor deposition (CVD) method in a high vacuum using a nozzle injector for the ethanol gas supply. By optimizing the ethanol pressure, we could grow SWCNTs between 330 and 700 °C, and the optimal ethanol pressure to obtain the highest SWCNT yield was reduced as the growth temperature decreased. Using transmission...
The occurrence of water sorption hysteresis associated with the filling of micro and narrow mesopores (particularly for pores of widths smaller than ca. 3 nm, where nitrogen and argon isotherms at their boiling temperatures, i.e. 77 K and 87 K, respectively, are known to be reversible) provides additional opportunities for textural characterization. In this work systematic water scanning desorption...
A hybrid featuring the CuInS2 quantum dots (CuInS2-QDs) on reduced graphene oxide (rGO) sheets is synthesized by a facile one-pot solvothermal approach with thiourea as S source, in which graphene oxide (GO) sheets are reduced into rGO sheets in course of the CuInS2-QDs aggregate growth. The growth mechanism of the hybrid is elucidated. It is found that adsorption of Cu2+ cations mainly takes place...
Industrially high-density polyethylene (HDPE) was successively covered by two types of amorphous hydrogenated carbon (a-C:H) films, one more flexible (f-type) and the other more robust (r-type). The films have been grown by radio frequency plasma-enhanced chemical vapor deposition (RF-PECVD) technique with acetylene plasma. The surface morphology of both types has been studied by atomic force microscopy...
Single-walled carbon nanotubes (SWCNT) synthesized using the HiPco® process and purified thereafter were submitted to two covalent functionalization processes: i) a mild oxidation in a concentrated HNO3 solution using microwave irradiation and ii) a radical functionalization to graft methoxyphenyl groups. The samples were analyzed by Raman spectroscopy and spectroscopic ellipsometry in the energy...
The morphology and nanostructure of soot particles as a function of fuel type in a laminar diffusion flame were studied. The fuels considered were heptane, toluene, the volumetric mixture 50% heptane – 50% toluene and a commercial gasoline. The structural features of soot sampled in the flame were inferred using HRTEM. An image analysis algorithm was developed to calculate the fringe length, tortuosity...
In this study, the tribological behavior of in-situ exfoliated graphene for water-based lubricants is investigated. The aqueous graphene dispersions show high stability due to the assistance of a non-ionic surfactant, Triton X-100. The steel–steel ball-plate tribotest results reveal that the in-situ exfoliated graphene possesses brilliant frictional and anti-wear properties. Compared with pure deionized...
A facile bottom-up approach for producing nitrogen doped graphene quantum dots (N-GQDs) was carried out by the carbonization of ammonium citrate under atmospheric pressure. And further, N-GQDs/BiOBr nanohybrids with N-GQDs uniformly distributed on BiOBr nanoplates were fabricated by a one-pot solvothermal method using the proposed N-GQDs as the precursor. As an excellent enhancer, the doped N-GQDs...
Organic phototransistor (OPT) is a promising organic device with substantial attention due to its photodetection combined with lightweight, flexibility, large-scale yields, and low cost of organic materials. In addition, spectral tunability and long photocarrier lifetime for organic materials make them highly attractive for advanced optoelectronic device applications. Here, we report high-performance...
In this study, we report a potentially scalable strategy for the cost/time-efficient production of water-soluble functionalized few layered graphene (FcG) through the mild defluorination of graphite fluoride (GF) at room temperature (RT). The strategy includes mechanical milling which is of high simplicity and operability, and subsequently water purification. By using heteroatom-containing alkaline...
Heel formation on three activated carbon fiber cloths (ACFC10, ACFC15, and ACFC20, with increasing pore widths and volumes) was assessed after cyclic adsorption/resistive heating regeneration using 1,2,4-trimethylbenzene (TMB). Following regeneration at 288 °C, cumulative heel for ACFC10, ACFC15, and ACFC20 was 3.5 wt%, 4.1 wt%, and 4.2 wt%, respectively. Adsorption capacity of ACFC10; however, dropped...
Recently, hexagonal boron nitride (h-BN) has been shown to act as an ideal substrate to graphene by greatly improving the material transport properties thanks to its atomically flat surface, low interlayer electronic coupling and almost perfect reticular matching [1]. Chemical vapour deposition (CVD) is presently considered the most scalable approach to grow graphene directly on h-BN. However, for...
We investigate the effect of fluorine-functionalisation of nanoporous silicon carbide-derived carbon (SiCDC), on its structural as well as adsorption properties, with the aim of assessing its suitability for CO2 capture. The morphology and structure of samples fluorinated to three different F/C ratios are characterized by several analysis techniques, as well as gas adsorption. Fluorination is seen...
Tuning the thermal transport properties of graphene is under intense investigation to achieve novel material functionalities. Here we propose a strategy of networked nanoconstrictions to maintain the ultrahigh thermal conductivity like in design of graphene-based integrated circuits, or to reduce to the minimum for thermoelectrics of energy conversion. By using molecular dynamics simulations, we study...
The mechanisms for oxygen etching of graphene on Ir(111) are uncovered through a systematic variation of the graphene morphology – ranging from an impermeable graphene layer to graphene nanoflakes – and the application of complementary experimental methods, including scanning tunneling microscopy, X-ray photoelectron spectroscopy, and temperature programmed desorption. Associated with a strong variation...
Influences of the arrayed carbon fibers (CFs) and gradiently dispersed Fe nanoparticles (NPs) inside epoxy resin (ER) matrix on the microwave absorption and mechanical properties were investigated. As a microwave absorbent, the Fe NPs were synthesized by an arc discharge plasma method and subsequently surface-modified by using of silane coupling agent (KH-550) to improve their dispersion in organic...
A type of lightweight and flexible multi-walled carbon nanotube (MWCNT)/waterborne polyurethane (WPU) composites is fabricated, which show superior shielding effectiveness (SE) of electromagnetic interference in the X-band even under the thin thickness of samples. The thickness values 0.05, 0.32 and 0.8 mm correspond to SE of 24, 49 and 80 dB, respectively. This attributes to the extremely high MWCNT...
Synthesis of carbon nanostructures with controlled defect distribution holds tremendous promise in engineering novel materials for specific device applications and catalysis. Carbon spheres (CS) can be synthesized by controlled thermal pyrolysis of polyethylene (PE) via a series of self-generated pressure reactions. Here, we show that point defect distribution in these CS can be tailored by controlling...
One-step direct laser writing (DLW) method has been applied to fabricate flexible and conductive graphitic porous patterns or arrays from polyimide. With assistance of electron microscopy, Raman and energy dispersive spectroscopy, X-ray scattering, and the coupled electrical and mechanical test, a systematic processing-structure-property relationship study was performed to investigate the effect of...
Rapid expansion in microelectronic devices has prompted increasing research efforts in development of high-frequency electromagnetic wave absorption materials. Multiple-phase FeSn2/Sn/Graphite core–shell nanoparticles synthesized by an arc-discharge method, with controllable components and structures, present a typical cloaking feature aroused from the superior electromagnetic wave absorption. Based...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.