Applied Physics Letters, 31 March 2008
Appl. Phys. Lett. 92, 133305 (2008) (3 pages)
©2008 American Institute of Physics. All rights reserved. 
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The effect of molecule-molecule and molecule-substrate interaction in the formation of Pt-octaethyl porphyrin self-assembled monolayers
Nuri Oncel and Steven L. Bernasek(a)
Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
(Received: 6 January 2008; accepted: 10 March 2008; published online: 1 April 2008)The adsorption of Pt-octaethyl porphyrin (Pt-OEP) molecules on highly ordered pyrolytic graphite (HOPG) and on 5-(octadecyloxy) isophthalic acid covered HOPG was studied with scanning tunneling microscopy at the solid-liquid interface. Pt-octaethyl porphyrin molecules lie flat on both surfaces and form a hexagonal lattice with an internal angle of about 60° and a lattice spacing of approximately 1.2 nm. The similar overlayer structure observed on the dramatically different substrates suggests that molecular packing in the Pt-OEP layer controls the structure. ©2008 American Institute of Physics
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