Dynamics or Stochastic Conductance Switching of Phenylene-Ethynylene Oligomers?

Hallbäck, Ann-Sofie and Poelsema, Bene and Zandvliet, Harold J.W. (2007) Dynamics or Stochastic Conductance Switching of Phenylene-Ethynylene Oligomers? ChemPhysChem, 8 (5). pp. 661-665. ISSN 1439-4235

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Abstract:	Scanning tunneling microscopy (STM) studies of phenylene-ethynylene oligomers inserted in alkanethiolate self assembled monolayers (SAMs) are presented. Spontaneous changes in appearance of bundles of inserted molecules during imaging are observed. The results indicate that the appearance changes are caused by fluctuations of the number of molecules in the bundles, by diffusion and exchange of molecules, in contrast to previous reports which attribute the changes to stochastic conductance switching. The packing density of the SAM around the bundles of inserted molecules influence the fluctuations, as the fluctuations observed at 77 K all take place in bundles inserted at locally less-densely packed SAM areas. At room temperature fluctuations of bundles inserted in well-ordered areas are also observed.
Item Type:	Article
Copyright:	© 2007 Wiley InterScience
Faculty:	Science and Technology (TNW)
Research Group:	Physics of Interfaces and Nanomaterials (PIN)
Link to this item:	http://purl.utwente.nl/publications/72256
Official URL:	http://dx.doi.org/10.1002/cphc.200600744
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