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Diamond/CeF3 composite film (DCCF) electroluminescence devices was fabricated on highly doping n-type silicon substrates by using plasma chemical vapor deposition techniques and vacuum electron beam evaporation techniques. The films were characterized by field emission scanning electron microscopy (FE-SEM), Energy dispersive spectrum (EDS), X-ray diffraction (XRD) and electroluminescence (EL) spectrum...
Double-gated graphene field effect transistors (GFETs) have been fabricated using the graphene grown by CVD method as channel conductor and the organic ferroelectric P(VDF-TrFE) film spin-coated as top gate insulator. An interesting method for efficiently modulating the charge transport characteristics of graphene films by introducing double-gated graphene field-effect transistor structure and organic...
We report the temperature and gate voltage dependent electrical properties of PZT gated graphene field effect transistors (PZT-GFETs) in the vacuum atmosphere. The PZT-GFETs exhibit p-type characteristics which are attributed to the chemical doping induced the Fermi level shifting below the Dirac point. Meanwhile, it also shows a large memory window. The temperature dependencies of the source-drain...
Hierarchically porous N-doped carbon nanoflakes (HPNCNFs) were facilely synthesized on a large scale via pyrolysis of 1,8-diaminonaphthalene (DAN)/FeCl3·6H2O mixture under Ar followed by acid leaching. Both pyrolysis temperature and the amount of Fe species have strong influence on catalyst activity. It suggests that the presence of large excess Fe species not only is key to nanoflake formation but...
Nanofiber fabric is firstly introduced to replace common microfiber fabrics as the platform for flexible supercapacitors. Nanofiber and microfiber electrodes can be simply fabricated using a dipping process that impregnates reduced graphene oxide (RGO) nanosheets into electrospun polyamide-66 (PA66) nanofiber and microfiber fabrics. RGO nanosheets are tailored to various sizes and only RGO with a...
Graphene oxide (GO) was firstly employed as nanoscale reinforcement fillers in hydroxyapatite (HA) coatings by a cathodic electrophoretic deposition process, and GO/HA coatings were fabricated on pure Ti substrate. The transmission electron microscopy observation and particle size analysis of the suspensions indicated that HA nanoparticles were uniformly decorated on GO sheets, forming a large GO/HA...
Direct-current (DC) arc plasma jet has been utilized to anneal chemical vapor deposited (CVD) polycrystalline diamond produced by the same device. Intense heating pulses around several target temperatures were achieved under constant plasma state and chamber pressure (∼5kPa), which ensured this plasma low-pressure/high-temperature (LPHT) treatment succeed without diamond graphitization. The treatment...
F and N co-doped reduced graphene oxide (F,N-RGO) was synthesized by annealing the mixture of N-doped reduced graphene oxide (N-RGO) and XeF 2 at 180°C. The photoluminescence (PL) properties of F,N-RGO were studied. The results show that F,N-RGO exhibits two strong ultraviolet (UV) PL centered at 365 and 310nm, and the PL at 310nm can be appropriately tuned by tailoring the N content further.
Ultrananocrystalline diamond (UNCD) films were prepared by microwave plasma chemical vapor deposition using argon-rich CH 4 /H 2 /Ar plasmas with different H 2 concentrations from 5% to 20%. The influence of the H 2 concentration on the microstructure, morphology and phase composition of the UNCD films was investigated by SEM, XRD, surface profilometry and Raman spectroscopy...
A simple, low-cost method for fabricating nitrogen-doped graphene (NG) is demonstrated by combining the ultrafast thermal exfoliation and covalent transformation from the melamine (MA)–graphene oxide (GO) mixture. NGs prepared at 300, 600, and 900°C were systematically characterized by X-ray photoelectron spectroscopy (XPS), in which pyridinic-N, pyrrolic-N and graphitic-N are the main nitrogen-doped...
We prepared flexible, lightweight, and high electromagnetic interference (EMI) shielding performance graphene nanosheet (GNS)/water-borne polyurethane (WPU) composites. WPU, with sulfonate functional groups, was used as the polymer matrix. By adsorbing the cationic surfactant (stearyl trimethyl ammonium chloride) on the surface of the GNSs (S-GNSs), restacking and aggregation of the GNSs have been...
Silver nanowires (AgNWs), modified by cysteamine, with a high electrical conductivity can be combined with high surface area graphene nanosheets (GNs) to form AgNW–GN hybrid nanomaterials. These materials with –NH3+ functional groups in an alkaline environment can be deposited on waterborne polyurethane surfaces with the attraction of sulfonate functional groups to prepare transparent conductive films...
Recent studies have demonstrated that carbon nano-onion (CNO) is a promising candidate for high-power supercapacitors due to the nonporous outer shell, which is easily accessible to electrolyte ions. However, the nonporous ion-accessible outer shells also limit the energy density of the CNOs, which requires large specific surface area. Introducing porosity to the outer shells of CNOs can effectively...
A simple approach was developed to synthesize the three-dimensional (3D) hybrid of manganese dioxide (MnO 2 ) and graphene foam. The morphology of the MnO 2 nanostructures can be readily controlled by the solution acidity. Furthermore, we demonstrate that, serving as a free-standing supercapacitor electrode, this novel three-dimensional hybrid gives a remarkable specific capacitance...
N-doped graphene (NG) was synthesized by annealing reduced graphene oxide (RGO) in an ammonia atmosphere. The dependence of the nitrogen content on the annealing temperature and the type of doping of NG were investigated. The photoluminescence (PL) properties of the RGO and NG samples were studied. The results show that RGO exhibits strong ultraviolet (UV) PL at 367nm. The PL of RGO can be quenched...
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