The wetting and capillarity of carbon nanotubes were studied in detail here. Nanotubes are not "super-straws," although they can be wet filled by substances having low surface tension, such as sulfur, selenium, cesium, with an upper limit to this tension less than 200 millinewtons per meter. This implies that typical pure metals will drawn into the inner cavity through capillarity, whereas water organic solvents will. These results have important implications for further use experiments on a...

Multifunctional nanoporous graphene is realized as a heat generator to convert solar illumination into high-energy steam. The novel 3D demonstrates highly energy-effective steam generation with an energy conversation of 80%. As service our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed may be re-organized for online delivery, but not copy-edited or typeset. Technical support issues arising from (other than missing...

Gram‐quantities of pure carbon nanotubes (see Figure) can be produced using a new method reported here. The nanotubes, which thought as cylindrical graphitic microcrystals, are opened and purified by treating them with mixtue sulfuric acid potassium permanganate. opening the on large scale is also interest in terms filling tubes interesting guest molecules. magnified image

Bicontinuous nanoporous N-doped graphene with tunable pore size is synthesized by Ni-based chemical vapor deposition. The novel 3D material shows an outstanding catalytic activity towards the oxygen reduction reaction a low onset potential of −0.08 V and high kinetic current density 8.2 mA cm−2 at −0.4 V.

Abstract We report three‐dimensional (3D) nanoporous graphene with preserved 2D electronic properties, tunable pore sizes, and high electron mobility for applications. The complex 3D network comprised of interconnected retains a coherent system massless Dirac fermions. transport properties the show semiconducting behavior strong pore‐size dependence, together unique angular independence. free‐standing, large‐scale holds great promise practical applications in devices.

An anomalous distortion is often observed in the transfer characteristics of graphene field-effect transistors. We fabricate transistors with ferromagnetic metal electrodes, which reproducibly display distorted characteristics, and show that caused by metal-graphene contacts no charge-density pinning effect. The effect, where gate voltage cannot tune charge density at has been experimentally observed; however, a pinning-free interface achieved easily-oxidizable metals. should be serious...

Graphene fabricated on a SiO2/Si substrate by mechanical exfoliation has two features: one is charge (electron and hole) puddles which inhomogeneously distribute graphene flakes, the other ripples exist in two-dimensional crystals. The effects of these features chemical reactivity flakes toward transfer chemistries with nitrobenzene diazonium tetrafluoroborate are explored Raman spectroscopy. results indicate that electron more corrugated regions possess enhanced reactivity. anomalously...

Abstract We report three‐dimensional (3D) nanoporous graphene with preserved 2D electronic properties, tunable pore sizes, and high electron mobility for applications. The complex 3D network comprised of interconnected retains a coherent system massless Dirac fermions. transport properties the show semiconducting behavior strong pore‐size dependence, together unique angular independence. free‐standing, large‐scale holds great promise practical applications in devices.

Nanoporous graphene- based electric-double-layer transistors (EDLTs) are successfully fabricated. Transport measurements of the EDLTs demonstrate that ambipolar electronic states massless Dirac fermions with a high carrier mobility well preserved in 3D nanoporous graphene along anomalous nonlinear Hall resistance and exceptional transistor on/off ratio. This study may open new avenue for device applications graphene. As service to our authors readers, this journal provides supporting...

Graphene with excellent 2D characters has been required to expand their potentials for meeting applicational demands in recent years. As one avenue, several approaches fablicating 3D porous graphene network structures have developed realize multi-functional materials graphene. Here we overview characteristics of future electronic device applications along physical insights into "2D graphene", where the such as massless Dirac fermions are well preserved. The present review thus summarizes...

Oxygen molecules are found to exhibit non-negligible reactivity with graphene under strong light irradiation in the presence of water. The reaction is triggered by laser Raman spectroscopy measurement itself, and D band (ca. 1340 cm-1) becomes larger as prolonged. electronic transport properties derivative also investigated both electron hole mobility be reduced. These results attributed oxidation graphene. This primitive modification method can exploited manipulate structural

Because of the large reactivity single layer graphene to electron-transfer chemistries, 4-nitrobenzene diazonium tetrafluoroborate is employed modify electrical properties field-effect transistors. After modification, transfer characteristics chemically modified show a reduction in minimum conductivity, electron–hole mobility asymmetry, decrease electron/hole mobility, and positive shift charge neutrality point with broadening conductivity region. These phenomena are attributed...

A method for determining the type of charge carrier, electron or hole, which is transferred from metal contacts to graphene, described. The Dirac point found shift toward more negative (positive) gate voltages (hole) doping by shortening interelectrode spacing. accompanied an enhancement electron-hole conductivity asymmetry. Experimentally determined carrier types may be explained in terms work functions modified interactions with graphene.

The gate-voltage (VG) dependence of the contact resistance (RC) in graphene field-effect transistors is characterized by transmission line model. RC-VG characteristics Ag, Cu, and Au contacts display a dip around charge neutrality point become even negative with Ag contacts. structure well reproduced model calculation that considers metal-contact-induced potential variation near metal edges. apparently RC originates carrier doping from to channel appears when effect more substantial than...

The electronic states of potassium- (K-) intercalated zigzag-type polycyclic aromatic (PLA) hydrocarbon [polyacene PLAs] ${\mathrm{K}}_{x}(\mathrm{PLAs})$ are studied for a series the four smallest molecules: naphthalene (NN), anthracene (AN), tetracene (TN), and pentacene (PN), focusing on their 1:1 stoichiometric phases. Clear experimental differences identified between first group [${\mathrm{K}}_{1}(\mathrm{NN})$ ${\mathrm{K}}_{1}(\mathrm{AN})$] second [${\mathrm{K}}_{1}(\mathrm{TN})$...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Orientationally-Ordered Primitive-Cubic Form of the Fulleride CsC60Alexandros Lappas, Mayumi Kosaka, Katsumi Tanigaki, and Kosmas PrassidesCite this: J. Am. Chem. Soc. 1995, 117, 28, 7560–7561Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 July 1995https://pubs.acs.org/doi/10.1021/ja00133a036https://doi.org/10.1021/ja00133a036research-articleACS PublicationsRequest reuse permissionsArticle...

High quality bulk samples of anthracene (AN) doped with potassium (K) in 1 : and 2 stoichiometries were successfully prepared by a method involving room temperature solid-state mechanical diffusion process prior to intercalation reactions during heat treatment, their physical properties studied using both magnetic optical measurements. The transfer almost one electron from K AN K1(AN) was confirmed SQUID ESR A pronounced hump centered at 150 associated antiferromagnetic interactions...

The thermodynaqmics for intercalation of phenanthrene (PHN) with Ba, which superconductivity has been reported, is studied in comparison its isomer a linear aromatic hydrocarbon anthracene (AN). Contrary to previous reports by other authors, the important observation that Ba intercalated into neither PHN nor AN without affecting their molecular structures unambiguously made differential scanning calorimetry measurements and annealing time dependences observed powder x-ray diffraction (XRD)...

Charge transfer (CT) at metal-graphene contacts induces a potential variation from the contact edges that extend to ∼1 μm. Potential variations with similar length should be observed around charge-transferring surface adsorbates. Thus, it is expected competition exists between these two CT sources when one source within μm other. In this letter, weakly coupled Ni and 7,7,8,8-tetracyanoquinodimethan molecules are employed as investigate their possible competition. The adsorbed only in channel...

A small amount of defects (less than 0.01%) were introduced into graphene by irradiating it with ultraviolet (UV) light in water. The chemisorbed oxygen species caused a limited degradation the charge carrier mobility, while physisorbed water molecules both reduction mobility and hole doping. oxidation was nonuniform, owing to variations potential metal contacts. Raman spectroscopy measurements revealed that UV irradiation promoted mild graphene's basal plane, which enhanced electrical...

Graphene field-effect transistors with source/drain contacts made of metals that can be easily oxidized such as ferromagnetic often display a double dip structure in the transfer characteristics because charge density depinning at contacts. Generally, show no dependence on length carrier injection occurs mainly edges contact. However, shape devices fabricated using Ni is found to dependent This peculiar behavior was attributed from near center oxygen diffusion and resultant formation an...

Abstract High‐quality polycrystalline polyacenes (PLAs) of anthracene (AN), tetracene (TN), and pentacene (PN) doped with potassium in the 1:1 1:2 stoichiometries are prepared their physical properties systematically studied by magnetic measurements. The susceptibilities as a function temperature for K x interpreted framework band‐filling model. Clear evidence occurrence charge transfer from to organic semiconductors is provided. 1 (AN) solid‐state diffusion process exhibits pronounced hump...

An empirical model is developed to characterize metal-contact effects on the transfer characteristics of graphene field-effect transistors. The present based a diffusive transport, and considers charge carrier doping from metallic electrodes adjacent channel. electron–hole conductivity asymmetry, one main features in characteristics, well reproduced by model. Model calculations with varied parameters show that asymmetry becomes more distinct higher charge-carrier mobility, level at metal...

Electron paramagnetic resonance (EPR) is applied to orthorhombic ${\mathrm{Rb}}_{1}{\mathrm{C}}_{60}$ 1D polymer under hydrostatic pressure. The EPR linewidth interpreted in terms of Elliott mechanism. signal intensity provides us the antiferromagnetic transition temperature ${T}_{\mathrm{N}}$ where drops suddenly. Finally, a phase diagram electronic states $o{\ensuremath{-}\mathrm{R}\mathrm{b}}_{1}{\mathrm{C}}_{60}$ constructed from vs pressure diagram, along with resistivity pressure,...