Abstract Few‐layered films of WS 2 , synthesized by chemical vapor deposition on quartz, are successfully used as light sensors. The film samples structurally characterized Raman spectroscopy, atomic force microscopy, scanning electron and high‐resolution transmission microscopy. produced consist few layered sheets possessing up to 10 layers. UV–visible absorbance spectra reveals absorption peaks at energies 1.95 2.33 eV, consistent with the A B excitons characteristic . Current–voltage ( I...

Jet stream: Multi-walled carbon nanotubes grown by catalytic chemical vapor deposition were carboxylated in a two-step oxidation process. An aqueous dispersion of the functionalized was dispensed using an inkjet printer to obtain electrically conductive patterns on paper and plastic surfaces (see picture). Sheet resistivities for deposited about 40 kΩ/□ could be achieved multiple prints.

We present a scalable and facile technique for noncovalent functionalization of graphene with 1-pyrenecarboxylic acid that exfoliates single-, few-, multilayered flakes into stable aqueous dispersions. The exfoliation mechanism is established using stringent control experiments detailed characterization steps. Using the exfoliated graphene, we demonstrate highly sensitive selective conductometric sensors (whose resistance rapidly changes >10,000% in saturated ethanol vapor), ultracapacitors...

We present the fabrication and electrical characterization of a flexible hybrid composite structure using aligned multiwall carbon nanotube arrays in poly(dimethylsiloxane) (PDMS) matrix. Using lithographically patterned arrays, one can make these structures at any length scale from submicrometer levels to bulk quantities. The PDMS matrix undergoes excellent conformal filling within dense network, giving rise extremely conducting with unique electromechanical properties. demonstrate its...

Nitrogen (15N) and carbon (12C) ion implantations with implant energy of 100 keV for different doses were performed on nanosized diamond (ND) particles. Magnetic measurements the doped ND show ferromagnetic hysteresis behavior at room temperature. The saturation magnetization (M(s)) in case 15N implanted samples was found to be higher compared 12C dose sizes greater than 10(14) cm(-2). role structural modification or defects along carbon-nitrogen (C-N) bonding states observed enhanced...

We have studied the role of defects on magnetic properties carbon materials using first-principles density functional methods. show that, while total magnetization decreases both for diamond and graphite with increase in vacancy density, more rapidly graphitic structures. The presence nitrogen nearby a is shown to produce larger macroscopic signals as compared standalone vacancy. results indicate possibility tuning by controlled defect generation doping.

The ability to synthesize high-quality samples over large areas and at low cost is one of the biggest challenges during developmental stage any novel material. While chemical vapor deposition (CVD) methods provide a promising low-cost route for CMOS compatible, large-scale growth materials, it often falls short demands in nanoelectronics optoelectronics. We present CVD synthesis single- few- layered MoS2 using direct vapor-phase sulfurization MoO2, which enables us obtain extremely...

Solid lubricants (SLs) characterized by low coefficients of friction (μ) and wear rates (w) drastically improve the life span instruments that undergo extreme frictional wear. However, performance SLs such as sputtered or nanoparticulate molybdenum disulfide (MoS2), tungsten (WS2), graphite deteriorates heavily under operational conditions elevated temperatures high humidity. Here, we present our preliminary results, which demonstrate composites carbon nanotubes (CNTs) MoS2 produced...

We report on the electrochemical charge storage behavior of few-layered flakes molybdenum disulfide (MoS2) obtained by liquid phase exfoliation bulk MoS2 powder in 1-dodecyl-2-pyrrolidinone. The specific capacitances exfoliated using a 6 M KOH aqueous solution as an electrolyte were found to be order magnitude higher than those (∼0.5 and ∼2 mF cm(-2) for electrodes, respectively). also showed significant different electrolytes, such organic solvents [1 tetraethylammonium tetrafluoroborate...

Abstract Here, we present a temperature ( T ) dependent comparison between field-effect and Hall mobilities in transistors based on few-layered WSe 2 exfoliated onto SiO . Without dielectric engineering beyond -dependent threshold gate-voltage, observe maximum hole approaching 350 cm /Vs at = 300 K. The mobility reaches value of 650 as is lowered below ~150 K, indicating that insofar -based (FETs) display the largest among transition metal dichalcogenides. gate capacitance, extracted from...

By fabricating and characterizing multi-layered MoS$_2$-based field-effect transistors (FETs) in a four terminal configuration, we demonstrate that the two terminal-configurations tend to underestimate carrier mobility $\mu$ due Schottky barriers at contacts. For back-gated two-terminal configuration observe mobilities as high 125 cm$^2$V$^{-1}$s$^{-1}$ which is considerably smaller than 306.5 extracted from same device when using four-terminal configuration. This indicates intrinsic of...

We report on the simple route for synthesis of chemically reduced graphene oxide (rGO) using ascorbic acid (a green chemical) as a reducing agent. Temperature-dependent electrical transport properties rGO thin films have been studied in wide range (50 K T 400 K) temperature. Electrical conduction was displayed two different temperature regimes. At higher temperatures, Arrhenius-like dependence resistance observed indicating band gap dominating behavior. lower sample showed mechanism...

We have experimentally determined the binding energies of Xe, CH4, and Ne on samples closed-ended single-wall nanotube (SWNT) bundles. find values for these quantities which are larger by approximately 75% SWNT than found same adsorbates planar graphite. also monolayer capacity a sample using Xe adsorption. A comparison all our results leads us to conclude that none gases studied adsorb interstitial channels in

We report on the fabrication of electrochemical double layer capacitor (EDLC) electrodes with aligned carbon nanotubes (CNTs) grown directly conductive substrates using an air assisted chemical vapor deposition technique. The fabricated EDLCs showed very small equivalent series resistances (∼few hundreds mΩ), a direct consequence integrating CNTs metal current collectors. specific capacitance used for EDLC increased decreasing CNT lengths and ranged from 10.75 F g−1 to 21.57 maximum energy...

We report on the performance of supercapacitor devices fabricated using 1-pyrenecarboxylic acid (PCA)-functionalized graphene electrodes. The specific capacitances obtained (using 6 M KOH aqueous solution as an electrolyte) was found to be order magnitude higher than nonfunctionalized electrodes (∼30 and ∼200 F/g for pure PCA-functionalized electrodes, respectively). analysis electrochemical impedance spectroscopy equivalent circuit modeling well electrolyte wettability measurements shows a...

Semiconducting 2D materials, like transition metal dichalcogenides (TMDs), have gained much attention for their potential in opto-electronic devices, valleytronic schemes, and semi-conducting to metallic phase engineering. However, graphene other atomically thin they lose key properties when placed on a substrate silicon, including quenching of photoluminescence, distorted crystalline structure, rough surface morphology. The ability protect these monolayer TMDs, such as molybdenum disulfide...

Adsorption of gas molecules on the surface atomically layered two-dimensional (2D) materials, including graphene and transition metal dichalcogenides, can significantly affect their electrical optical properties. Therefore, a microscopic quantitative understanding mechanism dynamics molecular adsorption desorption has to be achieved in order advance device applications based these materials. However, recent theoretical calculations have yielded contradictory results, particularly magnitude...

All solid-state flexible electrochemical double-layer capacitors (EDLCs) are crucial for providing energy options in a variety of applications, ranging from wearable electronics to bendable micro/nanotechnology. Here, we report on the development robust EDLCs using aligned multiwalled carbon nanotubes (MWCNTs) grown directly thin metal foils embedded poly(vinyl alcohol)/phosphoric acid (PVA/H3PO4) polymer gel. The substrate holding MWCNT assembly provides mechanical robustness and PVA/H3PO4...

The results of an adsorption isotherm investigation methane on closed-ended single-wall nanotube bundles are presented. isosteric heat was determined as a function the amount adsorbed SWNT substrate for coverages in first layer. is found to decrease with increasing coverage. This behavior provides explanation differences previously reported values this quantity. Substantial agreement between study and previous reports temperature dependence pressures at which two first-layer substeps occur...

We report an air-assisted chemical vapor deposition (CVD) method for the synthesis of super-long carbon nanotube (CNT) bundles. By mixing a small amount air in phase catalyst CVD process, lifetime can be dramatically increased, and extremely long dense aligned CNT bundles up to 1.5 cm achieved. Electron microscopy characterization shows that injection does not damage structures. Further, we have estimated individual ultra-long CNTs carry moderate current densities ∼10(5) A cm(-2), indicating...

Leather industry produces huge quantities of bio-waste that can be used as raw material for the bulk synthesis carbonaceous materials. Here we report multifunctional carbon nanostructures from pristine collagen wastes by a simple high temperature treatment. Our studies reveal nanocarbons derived have partially graphitized structure with onion-like morphology and are naturally doped nitrogen oxygen, resulting in properties. This synthetic route provides cost-effective alternative to existing...

We report on the low-temperature electrical transport properties of large area boron and nitrogen codoped graphene layers (BNC). The temperature dependence resistivity (5 K < T 400 K) BNC show semiconducting nature display a band gap which increases with B N content, in sharp contrast to layers, shows metallic behavior. Our investigations that amount dominates layers. This experimental observations agree density functional theory (DFT) calculations performed structures similar composition...

Abstract 2-Dimensional structures with swift optical response have several technological advantages, for example they could be used as components of ultrafast light modulators, photo-detectors and switches. Here we report on the fast photo switching behavior thin films liquid phase exfoliated MoS 2 , when excited a continuous laser λ = 658 nm (E 1.88 eV), over broad range power. Transient photo-conductivity measurements, using an pump THz probe (OPTP), reveal that carrier decay follows...