title: Nanostructuring of self-assembled porphyrin networks at a solid/liquid interface: local manipulation under global control.
abstract: Molecules of (5,10,15,20-tetraundecylporphyrinato)-copper(II) [(TUP)Cu] can self-assemble into four different polymorphs at the interface between highly oriented pyrolytic graphite and 1-octanoic acid. Scanning tunneling microscopy (STM) reveals that it is possible to combine the global control over monolayer structure, provided by the composition and concentration of the supernatant solution, with local control, from nanomanipulation by the STM tip. In the initially formed monolayer, with a polymorph composition governed by the concentration of (TUP)Cu in the supernatant solution, the exchange of molecules physisorbed at the solid/liquid interface with those in the liquid is very limited. By using a nanoshaving procedure at the tip, defects are created in the monolayer, and these serve as local manipulation sites to create domains of higher or lower molecular density, and to incorporate a second molecular species, (TUP)Co into the monolayer of (TUP)Cu.
authors.affiliation: Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen (The Netherlands); Current address: TMC Physics, Flight Forum 107, 5657 DC Eindhoven (The Netherlands).
authors.forename: Michiel J J
authors.initials: MJ
authors.lastname: Coenen
authors.forename: Tony
authors.initials: T
authors.lastname: Khoury
authors.forename: Maxwell J
authors.initials: MJ
authors.lastname: Crossley
authors.forename: Bas L M
authors.initials: BL
authors.lastname: Hendriksen
authors.forename: Johannes A A W
authors.initials: JA
authors.lastname: Elemans
authors.forename: Sylvia
authors.initials: S
authors.lastname: Speller
mesh_terms: D002210:Caprylates / Q000737:chemistry; D006108:Graphite / Q000737:chemistry; D016252:Microscopy, Scanning Tunneling; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D011166:Porphyrins / Q000737:chemistry*
chemical_list: D002210:Caprylates; D011166:Porphyrins; D006108:Graphite; C031492:octanoic acid
keywords: monolayers; nanomanipulation; porphyrins; scanning tunneling microscopy; self-assembly