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10 Sep 2007

Volume 91, Issue 11, Articles (11xxxx)

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Appl. Phys. Lett. 91, 112501 (2007); http://dx.doi.org/10.1063/1.2780107 (3 pages)

Y. Liu, S. Gliga, R. Hertel, and C. M. Schneider
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Observation of microslip dynamics at high-speed microcontacts

Brian Borovsky, Adam Booth, and Erin Manlove

Appl. Phys. Lett. 91, 114101 (2007); http://dx.doi.org/10.1063/1.2784172 (3 pages) | Cited 1 time

Online Publication Date: 12 September 2007

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The high-speed tribological properties of microscale contacts are studied using an indenter probe and quartz crystal microbalance. Elastic and dissipative shear forces are monitored as a function of contact radius for sapphire/gold interfaces with an adsorbed octadecanethiol monolayer. We observe shear force transitions understood as taking the interface from slipping to stuck conditions. They relate this behavior to the presence of interfacial microslip. Dynamic modeling shows that our observations are consistent with an interface that, when sliding, experiences full slip during half of each cycle. We discuss the implications for this technique as a sensitive probe of sliding friction.
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81.40.Pq Friction, lubrication, and wear
62.20.Qp Friction, tribology, and hardness
81.40.Jj Elasticity and anelasticity, stress-strain relations
62.20.D- Elasticity
68.35.Gy Mechanical properties; surface strains
68.35.Ct Interface structure and roughness

Molecular orientation of 3, 4, 9, 10-perylene-tetracarboxylic-dianhydride thin films at organic heterojunction interfaces

Wei Chen, Han Huang, Shi Chen, Lan Chen, Hong Liang Zhang, Xing Yu Gao, and Andrew Thye Shen Wee

Appl. Phys. Lett. 91, 114102 (2007); http://dx.doi.org/10.1063/1.2785948 (3 pages) | Cited 24 times

Online Publication Date: 14 September 2007

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In situ low-temperature scanning tunneling microscopy and near-edge x-ray absorption spectroscopy measurements have been used to investigate the molecular orientation of 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) thin films at the interface of organic heterojunctions of PTCDA on copper(II) phthalocyanine (CuPc). On the CuPc monolayer on highly oriented pyrolitic graphite, PTCDA molecules form a well-ordered in-plane herringbone structure with their molecular plane parallel to the substrate surface. The formation of multiple in-plane hydrogen bonding between neighboring PTCDA molecules is responsible for the flat-lying PTCDA on CuPc monolayer, and gives rise to the lying-down orientation of PTCDA thin films on both standing-up and lying-down CuPc thin films, as well as on Au(111) passivated by a self-assembled monolayer of octane-1-thiol.
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68.35.Ct Interface structure and roughness
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)
78.70.Dm X-ray absorption spectra
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