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Publication Citation: Variable Temperature Scanning Tunneling Microscopy of Pentacene Monolayer and Bilayer Phases on Ag(111)

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Author(s): Dan B. Dougherty; Jim Wei; William Cullen; Janice Reutt-Robey; Steven W. Robey;
Title: Variable Temperature Scanning Tunneling Microscopy of Pentacene Monolayer and Bilayer Phases on Ag(111)
Published: December 25, 2008
Abstract: Pentacene deposited onto a Ag(111) surface at 300 K is studied using scanning tunneling microscopy at temperatures of 300 K and 50 K.  At 300 K, ordered pentacene structures nucleate at Ag step edges (<i>Phys. Rev. B</i>  <b>2005</b>, 72, 115430) and  are surrounded by a pentacene phase without evident order.  The ordered structures visible at 300 K are revealed as bilayer structures from their coverage-dependent size evolution and molecularly resolved images of domain boundaries, recorded at 50 K.  At this reduced temperature, two different monolayer phases with long range order and commensurate with the Ag(111) surface lattice further emerge .  These two monolayer phases exhibit comparable (0.7 vs 0.8 molecule/nm<sup>2</sup>) packing densities, but distinct intermolecular registration and pentacene alignment with respect to the silver sublattice.<br><br>
Citation: Journal of Physical Chemistry C
Volume: 112
Issue: 51
Pages: pp. 20334 - 20339
Keywords: "adsorption"; "pentacene"; "scanning tunneling microscopy"
Research Areas: Thin-Films, Surface Physics, Chemistry, Surfaces, Chemical Physics