A graphene STM tip was fabricated using a MPECVD method. The single vertical graphene sheet was directly grown on the apex of tungsten tip. No oxide layer exists and catalyst is not needed. The high atomic resolution STM image was obtained using the graphene STM tip, which has atomic edge, excellent electric conductivity and stable crystal structure.
graphene will provide valuable information for the produc-tion of high-quality graphene. In this work, we show scanning tunneling microscopy (STM) topographs of as-grown graphene produced by the thermal decomposition of methane on high-purity polycrys-talline copper disks (see Supporting Information). The STM sheets is the origin of the observed features in our STM measurements. Dynamics of individual hydrogen atom intercalated between two graphene sheets. Unlike single carbon vacancies, which are difficult to generate in graphene (the formation energy is as high as about 7.4 eV) 12,18, 9, the hydrogen atoms are very easy
The graphene sheet is contacted at all edges with gold, so that the tunneling current diffuses in-plane through the gold film. Using optical microscope, the STM tip can be easily positioned on the conductive gold film (~500 µm × 500 µm). (B)-(C): STM topographs (800 nm × 800 nm) demonstrating how the graphene sheet is located for STM imaging. STM/STS measurements on graphene supported on standard SiO 2 and on metallic substrates. B3 is devoted to graphene supported above a graphite substrate and the observation of the intrinsic electronic properties including the linear density of states, Landau levels, the Fermi velocity, and the quasiparticle lifetime. The UHV STM studies of oxidized graphene revealed atomic scale periodicity showing a (0.273 ± 0.008) nm × (0.406 ± 0.013) nm unit cell over distances spanning few nanometers. This periodicity is identified with oxygen atoms bound to the oxidized graphene sheet. chemically exfoliated graphene thin sheet (∼1.5 nm) drop-cast on a SiO 2 substrate. In Figure 2b, the statis-tical thickness analysis for the graphene sheet ensem-ble shows that all of the graphene sheets had a thickness lower than 3 nm and more than 65% of the sheetswerethinnerthan2nm.Thelateralsizeofthese
Observation of Carrier-Density-Dependent Many-Body Effects in Graphene via Tunneling Spectroscopy Victor W. Brar (韦小宝),1,2 Sebastian Wickenburg (魏烈钢),1 Melissa Panlasigui,1 Cheol-Hwan Park,1,2 Fig. 1 Graphene and borophene-graphene heterostructures on Ag(111). (A) STM topography image of as-grown single-layer graphene on Ag(111) (V s = 0.3 V, I t = 500 pA) and (B) the corresponding differential tunneling conductance map.