Molecular-scale shear response of the organic semiconductor β-DBDCS (100) surface



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Álvarez-Asensio, Rubén and Moreno Ramírez, Jorge S. and Pimentel, Carlos and Casado, Santiago and Matta, Micaela and Gierschner, Johannes and Muccioli, Luca and Yoon, Seong-Jun and Varghese, Shinto and Park, Soo Young and Gnecco, Enrico and Pina Martínez, Carlos Manuel (2017) Molecular-scale shear response of the organic semiconductor β-DBDCS (100) surface. Physical review. B, Condensed matter and materials physics (Online), 96 (115422). pp. 1-7. ISSN 1550-235X

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In this work we present friction-force microscopy (FFM) lattice-resolved images acquired on the (100) facet of the semiconductor organic oligomer (2Z,2'Z) − 3,3'-(1,4-phenylene)bis(2-(4-butoxyphenyl)acrylonitrile) (β-DBDCS) crystal in water at room temperature. Stick-slip contrast, lateral contact stiffness, and friction forces are found to depend strongly on the sliding direction due to the anisotropic packing of the molecular chains forming the crystal surface along the [010] and [001] directions. The anisotropy also causes the maximum value of the normal force applicable before wearing to increase by a factor of 3 when the scan is performed along the [001] direction on the (100) face. Altogether, our results contribute to achieving a better understanding of the molecular origin of friction anisotropy on soft crystalline surfaces, which has been often hypothesized but rarely investigated in the literature.

Item Type:Article
Uncontrolled Keywords:Organic semiconductor β-DBDCS; Crystal
Subjects:Sciences > Geology > Crystallography
ID Code:51164
Deposited On:15 Feb 2019 08:33
Last Modified:09 Jun 2020 11:11

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