Thin film material of oriented multiwall carbon nanotubes was obtained by noncatalytical chemical vapor deposition in a glow-discharge plasma. The phase composition, surface morphology, and structural features were studied Raman electron microscopy techniques. Low-voltage field emission thin nanotube examined diode configuration. I–V curves Fowler–Nordheim coordinates linear the corresponding threshold average about 1.5 V/μm. current density up to 50 mA/cm2 at 5 site reached 107 cm−2 same...

Thin film cold cathodes composed of a graphite-type carbon coating on Si substrate have been fabricated and tested. Electrons from the were emitted into vacuum when average electric field exceeded 1.5 V/μm. The emission current density was more than 1 mA/cm2 site higher 107 cm2 at 4 current–voltage dependencies studied different temperatures 77 to 600 K found be typical for emission. We propose mechanism electron cathodes, based enhancement due surface morphology modification electronic...

A hydrogen sensor for detection of H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> dissolved in transformer oil has been developed the use a stand-alone gas analyzer (DGA) which will also assess relative humidity saturation oil. The uses palladium nanoparticles as sensitive material that is selective to hydrogen. DGA be capable measuring concentrations from 50 ppm 4000 ppm.

Thin carbon and metal foils have been used in heavy ion accelerators for charge stripping. The power dissipated by a particle beam foil can be as high 3 kW or greater, which results short lifetimes of conventional stripper foils. Graphene overcome critical limitations other materials due to unique combination their exceptional physical properties. authors fabricated graphene with diameters up 13 cm area densities 0.1 3.0 mg/cm2 reduction oxide an aqueous dispersion followed pressure...

An experimental study of the use graphene as an extractor (stripper) foil in 11-MeV Siemens Eclipse Cyclotron is discussed this paper. The main advantage its high thermal conductivity compared to that amorphous carbon films. Graphene also has significant mechanical strength. lifetime foils under proton bombardment exceeded 16,000 μAh. Graphene-based stripper demonstrated a increase transmission factor (defined ratio beam current on target foil), which was approximately 90%. Fabrication...

Electron field emission from diamond polycrystalline films fabricated by chemical vapor deposition has been studied. Emission properties of the are shown to vary in a wide range, depending on conditions. The minimal value initial at which current detected was about 0.5 V/μm. currents reached values 1.5 mA/cm2 10 were characterized Raman spectroscopy, electron diffraction, atomic force microscopy, cathodoluminescence, and optical absorption spectroscopy. We established correlation between...

A Raman spectrometer designed for the purpose of in-situ diagnostics materials deposited in a gas discharge plasma under conditions intense illumination from and heat radiation substrate is described. The characteristic feature use pulsed Cu-vapor laser as excitation source, along with gated detection signal photomultiplier tube. fully PC-controlled system made on base double grating monomchromator. operation demonstrated application to study processes growth modification polycrystalline...

Abstract Thin diamond films grown by chemical vapor deposition (CVD) process on Si substrates under similar conditions in the microwave‐excited (MW) and direct current (DC) plasma discharges were taken for comparative examination. Raman spectra, photoluminescence (PL) spectroscopy, color cathodoluminescence scanning electron microscopy (CCL‐SEM) have been used characterization of structure composition features poly‐crystalline films. No essential difference spectra CVD was detected. A...

A portable sensor for CO2 monitoring based on QEPAS technology and using a DFB diode laser operating at λ=1.57 μm will be described. The is primarily intended studies of penetration through soil.

Silver paste containing no aluminum powder has been developed to form low resistance contact on p+ diffusion zones for silicon solar cells. Unlike conventional Ag/Al pastes cell, silver without metallic reduces the risk of "spiking" issues that may damage PN-junction during high temperature fire-through process. A series and cell efficiency were demonstrated with this n-PERT This was found be capable forming contacts both n+ silicon. unique property lead a single print co-firing process IBC...

Neutron-rich isotopic 14C targets are of interest to the nuclear physics community and would be in high demand at any thickness. Applied Nanotech, Inc. (ANI) has developed freestanding natC 13C carbon foils fabricated using a drawdown printing technique. Isotopic enriched produced ANI, with Argonne National Laboratory (ANL) stock material available Argonne. The target is nominally ~73% will contain 2.2% organic binder. fabrication process highly material-efficient can used produce that...

We present a comparative study of the field emission from carbon films grown by CVD method in hydrogen-methane plasma activated dc discharge. varied deposition process parameters to obtain coatings with different type atomic coordination: typical polycrystalline diamond nanocrystalline graphite.

Many of the isotopes cannot be made as free-standing targets and require thin film backing. Low-Z backing materials, such amorphous carbon polymer films are materials choice for some experiments. However, limitations these poor thermal mechanical stability. All-carbon graphene would an excellent a material due to their high conductivity, temperature tolerance (3550°C melting point), low outgassing, integrity, ease handling. We fabricated variety using or host matrix. Using PVD sputtering...