Atomic-Scale Variations of the Mechanical Response of 2D Materials Detected by Noncontact Atomic Force Microscopy
EntityUAM. Departamento de Física Teórica de la Materia Condensada
PublisherAmerican Physical Society
10.1103/PhysRevLett.116.245502Physical Review Letters 116.24 (2016): 245502
ISSN0031-9007 (print); 1079-7114 (online)
Funded byWe thank the Marie Curie ITN Network “ACRITAS” (Grant No. FP7-PEOPLE-2012-ITN-317348) funded by the European Commission under the FP7 Marie Curie PEOPLE programme and the Spanish MINECO (Projects No. CSD2010-00024, No. MAT2011-23627, No. MAT2013-41636-P, and No. MAT2014-54484-P) for financial support. Computer time was provided by the Spanish Supercomputer Network (RES) at Marenostrum III (BSC, Barcelona) and Magerit (CesViMa, Madrid) computers. P. P. was supported by the Ramón y Cajal program
Projectinfo:eu-repo/grantAgreement/EC/FP7/317348; Gobierno de España. CSD2010-00024; Gobierno de España. MAT2011-23627; Gobierno de España. MAT2013-41636-P; Gobierno de España. MAT2014-54484-P
SubjectsDensity functional theory; Graphene substrates; Global deformations; Multi-scale modeling; Van Der Waals interactions; Física
Rights© 2016 American Physical Society
We show that noncontact atomic force microscopy (AFM) is sensitive to the local stiffness in the atomicscale limit on weakly coupled 2D materials, as graphene on metals. Our large amplitude AFM topography and dissipation images under ultrahigh vacuum and low temperature resolve the atomic and moiré patterns in graphene on Pt (111), despite its extremely low geometric corrugation. The imaging mechanisms are identified with a multiscale model based on density-functional theory calculations, where the energy cost of global and local deformations of graphene competes with short-range chemical and long-range van der Waals interactions. Atomic contrast is related with short-range tip-sample interactions, while the dissipation can be understood in terms of global deformations in the weakly coupled graphene layer. Remarkably, the observed moiré modulation is linked with the subtle variations of the local interplanar graphene-substrate interaction, opening a new route to explore the local mechanical properties of 2D materials at the atomic scale
Google Scholar:De la Torre, B. - Ellner, M. - Pou, Pablo - Nicoara, Nicoleta - Pérez, Rubén - Gómez-Rodríguez, J.M.
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Jiménez-Sánchez, Mariano D.; Sánchez-Abad, Nour; Nicoara, Nicoleta; Gómez-Rodríguez, José M.