Nanostructuring of Self‐Assembled Porphyrin Networks at a Solid/Liquid Interface: Local Manipulation under Global Control |
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| Authors: | Dr. Michiel J. J. Coenen Dr. Tony Khoury Prof. Maxwell J. Crossley Dr. Bas L. M. Hendriksen Dr. Johannes A. A. W. Elemans Prof. Sylvia Speller |
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| Affiliation: | 1. Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen (The Netherlands);2. Current address: TMC Physics, Flight Forum 107, 5657 DC Eindhoven (The Netherlands);3. University of Sydney, The School of Chemistry, NSW 2006 Sydney (Australia);4. Current address: University of Rostock, Universit?tsplatz 3, 18051 Rostock (Germany) |
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| 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. |
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| Keywords: | monolayers nanomanipulation porphyrins scanning tunneling microscopy self‐assembly |
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