Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
Supercapacitors, a new energy storage element based on electrochemical double layer capacitance, store energy by ion adsorption, have recently attracted increasing interest with the sharp development of nanostructure materials. Supercapacitors store and release energy by nanoscopic charge separation at the interface between an electrode and an electrolyte, and the energy restored in it is inversely...
Graphene, a newly discovered material with unusual electrical and optical properties, has attracted interest for a number of potential applications. One of the most actively pursued applications is using graphene as a transparent conducting electrode for use in solar cells, displays or touch screens. In this work, two studies are pursued in parallel to explore the electrical and optical properties...
In this work, a careful study on the electronic properties of 6-ZGNR with Pt doping at different sites using density functional theory, implemented in the CASTEP code was reported. Five different substitutional sites from the center to the edge of the 6-ZGNR were considered. The computational result indicates the antiferromagnetic (AFM) state is the most favorable for all the structures. So the band...
This paper presents direct growth approach for production of graphene and carbon nanotubes in an on-chip manner towards integrated devices. Vertically aligned arrays of carbon nanotubes and edge-oriented graphene are synthesized by microwave plasma-enhanced chemical vapor deposition using methane and hydrogen as precursors. Cyclic voltammetry (CV) and electrochemical energy impedance measurements...
This paper presents a universal segregation growth technique for batch production of high-quality wafer-scale graphene from non-noble metal films containing trace amounts of carbons. The extended applications of TiO2-based photocatalysis on engineering the single or few layer graphene under ordinary air ambience are also demonstrated.
The authors have introduced solution-processable functionalized graphene material (SPFGraphene) in P3HT/PCBM photovoltaic devices. The best results were obtained with a P3HT/PCBM (1:1) mixture with 10wt% of graphene is open-circuit voltage (Voc) of 0.64V, a short-circuit current density (Jsc) of 5.3mA/cm2 and a FF of 0.41 which led to a power conversion efficiency of 1.4% at illumination at 100mW/cm...
The following topics are dealt with: functionalization and modification of nanotubes and nanowires; electron emission phenomena; vacuum electronics; graphene related materials; field and photoelectron emission; materials, processing and equipment; nanodevices; nanomagnetism and spintronics.
Summary form only given. We studied the process of carbon nanotubes formation from diamond nanowires by using density functional tight-binding molecular dynamics. When diamond nanowires of 6-15 A in diameter with circle/square cross-sections were gradually heated, they transformed into single wall carbon nanotubes at the temperature range between 1500K and 3000 K. The probability of the transformation...
Summary form only given. In this talk, we would like to present the applications of graphene-based materials on large-area photovoltaic and optoelectronic devices. Chemically derived graphene-oxide (GO) from solution processes or epitaxial graphene obtained from chemical vapor deposition (CVD) have been demonstrated to replace the ITO electrode. GO could be also a simple solution processable alternative...
In this work, we will present a novel graphene synthesis technique, based on the ion implantation of carbon ions into polycrystalline transition metal thin films. Ion implantation is now a routine process developed by the semiconductor industry over the past three decades. It is used to dope the source and drain contact regions as well as to adjust the channel characteristics of CMOS transistors....
In this presentation, a solution based method that allows uniform and controllable deposition of reduced graphene oxide thin films with thicknesses ranging from a single monolayer up to several layers over large areas will be described. The oxidation treatment during synthesis of GO creates sp3 C-0 sites where oxygen atoms are bonded in the form of various functional groups. GO is therefore a two...
In this paper, the vibrational characteristics of graphene nanoribbon-based nanoresonators were investigated using molecular dynamics method based on Forcite module in Materials Studio.
Upon the development of the quantitative scanning transmission electron microscopy (QSTEM), individually counting the gold atom has been achieved. The correlation of the signals to the atom quantity (N), i.e. calibration, is its crucial work. One has to seek the ultra-fine mass standards, where the size-selected gold clusters rank the best recently. However, practically this is difficult for light...
In this paper we calculated the mechanical properties of graphene nanoribbons under tensile strains. Then the influence of tensile strain on electron transport properties is studied with first-principles calculations.
Summary form only given. Commercial expandable graphite was heat at 900 °C to get the worm-like graphene nanosheets. Using sulfuric acid and potassium permanganate to oxidize the expanded graphene nanosheet could further minish the thickness of graphene oxide sheet to less than 1nm, and this way to get the graphene was proved to be mass producible (tens of gram). Free-standing graphene oxide paper...
In the formation of SWCNT controlling of its diameter and chirality will be shown to be affected by controlling the size of the metal catalyst. The usual size of carbon nanohorn (CNH) particles is about 80 nm but its smaller size of less than 30nm is needed for a biomedical application purpose because of their permeation through biological cell membranes. The small CNHs have been successfully realized...
The authors report the growth of layered graphene on carbon fiber surfaces by DC-PCVD. The morphology and microstructure of the as-grown samples are characterised using SEM and HRTEM methods. Raman spectra and field emission characteristics are also discussed.
Summary form only given. Graphene has a one-dimensional edge of atomic thickness, excellent electrical conductivity, and good mechanical properties, which qualify it as an attractive novel field emission emitter. Several groups had demonstrated that graphene does show promising electron emission properties, such as low emission threshold field and large emission current density[1-7]. The traditional...
Here, an improved solvothermal reduction for the formation of high-quality graphene is reported. Graphite oxide (GO) are prepared using a modified Hummers method form expandable graphite. Then, GO sheets are dispersed into the mixture of hydrazine and water in a sealed autoclave maintained at 180°C for 18h. X-ray diffraction (XRD) pattern of the prepared GO is compared with that of graphene obtained...
A growing number of one-dimensional nanomaterials including nanotubes, nanorods and nanowires have been synthesized and found to give attractive field electron emission performance. Field emission from a two-dimensional (2D) regime is emerging as new hot topic, due to graphene can offer ones such opportunity, and its open surface and sharp edge may be beneficial for field emission. Two-dimensional...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.