An atomic force microcopy study of the mechanical and electricalproperties of monolayer films of molecules with aromatic end groups

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The effect of intermolecular {pi}-{pi} stacking on the electrical and mechanical properties of monolayer films molecules containing aromatic groups was studied using atomic force microscopy. Two types of aromatic molecules, (4-mercaptophenyl) anthrylacetylene (MPAA) and (4-mercaptophenyl)-phenylacetylene (MPPA) were used as model systems with different {pi}-{pi} stacking strength. Monolayer films of these molecules on Au(111) surfaces exhibited conductivities differing by more than one order of magnitude, MPAA being the most conductive and MPPA the least conductive. The response to compressive loads by the AFM tip was also found to be very different for both molecules. In MPAA films distinct molecular conductivity changes ... continued below

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Fang, Liang; Park, J.Y.; Ma, H.; Jen, A.K.-Y. & Salmeron, M. September 6, 2007.

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The effect of intermolecular {pi}-{pi} stacking on the electrical and mechanical properties of monolayer films molecules containing aromatic groups was studied using atomic force microscopy. Two types of aromatic molecules, (4-mercaptophenyl) anthrylacetylene (MPAA) and (4-mercaptophenyl)-phenylacetylene (MPPA) were used as model systems with different {pi}-{pi} stacking strength. Monolayer films of these molecules on Au(111) surfaces exhibited conductivities differing by more than one order of magnitude, MPAA being the most conductive and MPPA the least conductive. The response to compressive loads by the AFM tip was also found to be very different for both molecules. In MPAA films distinct molecular conductivity changes are observed upon mechanical perturbation. This effect however was not observed on the MPPA film, where intermolecular {pi}-{pi} interactions are likely weaker.

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  • Journal Name: Langmuir; Journal Volume: 23; Journal Issue: 23; Related Information: Journal Publication Date: 2007

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  • Report No.: LBNL--63408
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1021/la701489p | External Link
  • Office of Scientific & Technical Information Report Number: 929051
  • Archival Resource Key: ark:/67531/metadc895404

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  • September 6, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 31, 2016, 3:49 p.m.

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Fang, Liang; Park, J.Y.; Ma, H.; Jen, A.K.-Y. & Salmeron, M. An atomic force microcopy study of the mechanical and electricalproperties of monolayer films of molecules with aromatic end groups, article, September 6, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc895404/: accessed May 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.