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The atomic edge, excellent conductivity, stable chemical and mechanical properties make graphene a good candidate for the scanning tunneling microscopy (STM) tip. Here, a one-step growth method is used to fabricate graphene STM tips. The graphene was directly grown on a sharp tungsten tip vertically by using microwave plasma enhanced chemical vapor deposition method without any catalyst. The high...
The structure of multilayer graphene domains on Cu foil is revealed with atomic force microscopy and theoretical analysis. The phase images of force microscopy enable the separation of the graphene domains from the naked areas of Cu foil. Furthermore, the phase images enable the discrimination of the different graphene layers and structures. For example, some of small graphene layers show a darker...
In-depth study on upconversion photoluminescence (UCPL) of graphene oxide quantum dots (GOQDs) was presented. Uniform GOQDs with a single-layer and a circular shape within 4nm diameter were fabricated by acidic exfoliation from the graphite nanoparticles. The green UCPL of the GOQDs at ∼563nm was observed by a femto-second (fs) Ti:sapphire pulsed laser (λex: 800nm), and the mechanism of the observed...
Herringbone carbon nanofibers (CNFs) were efficiently produced by chemical vapor deposition on Ni nanoparticles derived from layered double hydroxide (LDH) precursors. The as-obtained CNFs with a diameter ranging from 40 to 60nm demonstrated herringbone morphologies when they grew on Ni/Al LDH derived catalysts both in the fixed-bed and fluidized-bed reactor. The Ni/Mg/Al, Ni/Cu/Al, as well as Ni/Mo/Mg/Al...
Carbon nanotube/polyurethane (CNT/PU) composites were prepared by using an in-situ polymerization method, and their electrical sensitivity to tensile strain was investigated. The addition of CNTs can remarkably enhance both the mechanical strength and electrical conductivity of the composite. The CNT/PU composite exhibits a high sensitivity of electrical resistance to changes in tensile strain. The...
Vertically oriented carbon nanosheet (VCNS)–carbon nanotube (CNT) hybrid films with a large area (∼4cm 2 ) were fabricated on Mo layers by using microwave plasma-assisted chemical vapor deposition technique. The Mo layers, which were deposited on Al 2 O 3 ceramic substrates through electron beam evaporation deposition, were pretreated by a laser-grooving technology (4lines/mm)...
High efficient sulfur cathode materials were constructed by the incorporation of aligned sulfur-coated carbon nanotubes (CNTs) and a polyethylene glycol (PEG) barrier at one end. During the charge and discharge of lithium sulfur batteries, high Li ion storage performance can be achieved on the composite electrode, which was benefited from both the aligned CNT structure and the polymer barrier. Aligned...
We report a simple fabrication method for large-scale free-standing graphene–gold nanoparticle and graphene-single wall carbon nanotube composite films by using a centrifugal vacuum evaporation followed by a thermal reduction process. The homogeneous mixture of a graphene oxide (GO) suspension with gold nanoparticle (Au NP) or single wall carbon nanotube (SWCNT) is self-assembled at the air/liquid...
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