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Título : Tip induced mechanical deformation of epitaxial graphene grown on reconstructed 6H–SiC(0001) surface during scanning tunneling and atomic force microscopy studies
Autor : Morán Meza, José Antonio
Lubin, Christophe
Thoyer, François
Cousty, Jacques
Palabras clave : Epitaxial graphene;STM;AFM;Mechanical properties;Silicon carbide
Fecha de publicación : jun-2015
Editorial : IOP Publishing Ltd
URI Relacionado: http://stacks.iop.org/0957-4484/26/i=25/a=255704
Resumen : The structural and mechanical properties of an epitaxial graphene (EG) monolayer thermally grown on top of a 6H-SiC(0001) surface were studied by combined dynamic scanning tunneling microscopy (STM) and frequency modulation atomic force microscopy (FM-AFM). Experimental STM, dynamic STM and AFM images of EG on 6H-SiC(0001) show a lattice with a 1.9 nm period corresponding to the (6 × 6) quasi-cell of the SiC surface. The corrugation amplitude of this (6 × 6) quasi-cell, measured from AFM topographies, increases with the setpoint value of the frequency shift Δf (15-20 Hz, repulsive interaction). Excitation variations map obtained simultaneously with the AFM topography shows that larger dissipation values are measured in between the topographical bumps of the (6 × 6) quasi-cell. These results demonstrate that the AFM tip deforms the graphene monolayer. During recording in dynamic STM mode, a frequency shift (Δf) map is obtained in which Δf values range from 41 to 47 Hz (repulsive interaction). As a result, we deduced that the STM tip, also, provokes local mechanical distortions of the graphene monolayer. The origin of these tip-induced distortions is discussed in terms of electronic and mechanical properties of EG on 6H-SiC(0001).
URI : http://cybertesis.uni.edu.pe/handle/uni/3762
Correo electrónico : jmoranm@uni.edu.pe
Derechos: info:eu-repo/semantics/embargoedAccess
Aparece en las colecciones: Instituto General de Investigación

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