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  Quantifying the atomic-level mechanics of single long physisorbed molecular chains

Kawai, S., Koch, M., Gnecco, E., Sadeghi, A., Pawlak, R., Glatzel, T., et al. (2014). Quantifying the atomic-level mechanics of single long physisorbed molecular chains. Proceedings of the National Academy of Sciences of the USA, 111(11), 3968-3972. doi:10.1073/pnas.1319938111.

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 Creators:
Kawai, Shigeki1, 2, Author
Koch, Matthias3, Author           
Gnecco, Enrico4, Author
Sadeghi, Ali1, Author
Pawlak, Rémy 1, Author
Glatzel, Thilo1, Author
Schwarz, Jutta5, Author
Goedecker, Stefan1, Author
Hecht, Stefan5, Author
Baratoff, Alexis1, Author
Grill, Leonhard3, 6, Author           
Meyer, Ernst1, Author
Affiliations:
1Department of Physics, University of Basel, 4056 Basel, Switzerland, ou_persistent22              
2Precursory Research for Embryonic Science, Japan Science and Technology Agency, 4056 Basel, Switzerland, ou_persistent22              
3Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
4Instituto Madrileño de Estudios Avanzados en Nanociencia, 28049 Madrid, Spain, ou_persistent22              
5Department of Chemistry, Humboldt-Universität zu Berlin, 12489 Berlin, Germany, ou_persistent22              
6Department of Physical Chemistry, University of Graz, 8010 Graz, Austria , ou_persistent22              

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Free keywords: force spectroscopy conjugated polymers adhesion friction nanomanipulation
 Abstract: Individual in situ polymerized fluorene chains 10–100 nm long linked by C–C bonds are pulled vertically from an Au(111) substrate by the tip of a low-temperature atomic force microscope. The conformation of the selected chains is imaged before and after manipulation using scanning tunneling microscopy. The measured force gradient shows strong and periodic variations that correspond to the step-by-step detachment of individual fluorene repeat units. These variations persist at constant intensity until the entire polymer is completely removed from the surface. Calculations based on an extended Frenkel–Kontorova model reproduce the periodicity and magnitude of these features and allow us to relate them to the detachment force and desorption energy of the repeat units. The adsorbed part of the polymer slides easily along the surface during the pulling process, leading to only small oscillations as a result of the high stiffness of the fluorenes and of their length mismatch with respect to the substrate surface structure. A significant lateral force also is caused by the sequential detachment of individual units. The gained insight into the molecule–surface interactions during sliding and pulling should aid the design of mechanoresponsive nanosystems and devices.

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Language(s): eng - English
 Dates: 2013-10-232014-03-18
 Publication Status: Issued
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1073/pnas.1319938111
 Degree: -

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Title: Proceedings of the National Academy of Sciences of the USA
  Other : Proc. Natl. Acad. Sci. U. S. A.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: National Academy of Sciences
Pages: - Volume / Issue: 111 (11) Sequence Number: - Start / End Page: 3968 - 3972 Identifier: ISSN: 0027-8424
CoNE: https://pure.mpg.de/cone/journals/resource/954925427230