English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/94341
Compartir / Impacto:
Add this article to your Mendeley library MendeleyBASE
Citado 3 veces en Web of Knowledge®  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)

Heterogeneous nanotribological response of polymorphic self-assembled monolayers arising from domain and phase dependent friction

Autor Paradinas, Markos; Munuera, C. ; Ocal, Carmen
Fecha de publicación 2013
EditorRoyal Society of Chemistry (Great Britain)
Citación Physical Chemistry Chemical Physics 15(4): 1302-1309 (2013)
ResumenMicro-/nanoelectromechanical systems demand robust ultrathin films for lubrication. As they can drastically modify the frictional properties of surfaces, few nanometers thick self-assembled monolayers (SAMs) constitute accepted candidates as boundary lubricants. Their high stability and easy preparation make them attractive also for low cost applications. Given their high order, organosulfur SAMs have been archetypal systems for structural investigations, but few efforts have been devoted to analyze the influence of lateral inhomogeneities on their surface properties. The impact on the frictional response of the surface due to the existence of crystalline domains with lateral dimension in the sub-micrometer range is considered here. To this end, two polymorphic structures of self-assembled monolayers of ω-(4′-methylbiphenyl-4-yl) butane-1-thiol coexisting on Au(111) are investigated by scanning tunneling and force microscopy. Described by rectangular 5(raiz de 5) x3 (α-phase) and oblique 6 (raiz de 3) x 2 (raiz de 3) (β-phase) unit cells, they exhibit pronouncedly different frictional responses. The lateral nano-tribological heterogeneity of the surface is further influenced by the azimuthal orientation dependence of friction for each phase. In particular, this phenomenon is exploited in the less densely packed β-phase for which the separate analysis of forward and backward lateral force scans is used to differentiate domains rotated 180°. The results demonstrate the level of structural control required in the design of SAMs for nano-tribology applications.
URI http://hdl.handle.net/10261/94341
Identificadoresdoi: 10.1039/c2cp43769d
issn: 1463-9076
e-issn: 1463-9084
Aparece en las colecciones: (ICMM) Artículos
(ICMAB) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
accesoRestringido.pdf15,38 kBAdobe PDFVista previa
Mostrar el registro completo

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.