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Graphene growth on Pt(111) using a MBE solid carbon source

AutorHernández-Rodríguez, Irene; García Martínez, Jorge Manuel ; López, María Francisca ; Martín-Gago, José A. ; Andrés, Pedro L. de ; Méndez, Javier
Fecha de publicaciónfeb-2014
CitaciónGrapEsp – A European Conference/Workshop on the Synthesis, Characterization and Applications of Graphene (2014)
ResumenNowadays graphene is considered a prototype material with interesting technological applications and properties [1]. Preparation methods greatly varies from scotch-tape mechanical transfer [2] (widely used in research laboratories), to Chemical Vapor Deposition (CVD) [3] (more appropriate for industrial applications). When this later method is used, the catalytic properties of the metallic substrate play a fundamental role during decomposition (cracking of C-H bonds) of hydrocarbons. In this work, we present a Molecular Beam Epitaxy (MBE) method to obtain graphene [4] on Pt(111). This procedure uses evaporation of carbon atoms from a carbon solid-source in ultra-high vacuum conditions. We have tested the formation of graphene on several surfaces: from a well establish substrate as platinum, to substrates where graphene can be formed using innovative methods as gold [5]. For the characterization of the graphene layers we have used several in situ surface science techniques as low energy electron diffraction (LEED), auger electron spectroscopy (AES) and scanning tunneling microscopy (STM). The successful evaporation of carbon has been probed on different substrates as platinum, HOPG, and gold. By annealing a Pt(111) surface up to 600ºC during carbon evaporation, we have observed a characteristic LEED diagram attributed to graphene [6]. STM images (see figure) display long range ordering of carbon monolayers showing several moirés patterns characteristic of graphene on Pt(111) [7], further proving the formation of graphene. This method opens the door for the formation of graphene on many different substrates with potential technological applications. Figure: STM image of graphene on Pt(111) showing long range moirés patterns and atomic resolution (Bias Voltage = -35.7mV, Current set-point = 0.04nA).
DescripciónPóster presentado en la GRAPHEsp2014 (A European Conference/Workshop on the Synthesis, Characterization and Applications of Graphene), celebrada en Lanzarote del 18 al 21 de febrero de 2014.
URIhttp://hdl.handle.net/10261/135223
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