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Tailoring two-dimensional PTCDA-melamine self-assembled architectures at room temperature by tuning molecular ratio.

Xiaonan X Sun, Harry T HT Jonkman, and Fabien F Silly

Nanotechnology 21(16):165602 (2010) PMID 20348601

Engineering and tuning multi-component supramolecular self-assemblies on surfaces is one of the challenges of nanotechnology. We use scanning tunneling microscopy to investigate the influence of molecular ratio on the self-assembly of PTCDA-melamine structures on Au(111)-(22 x complex square root of 3). Our observations reveal that three different chiral supramolecular networks having a PTCDA:melamine ratio of 3:2, 1:2, 1:4 can be selectively created by tuning the ratio of molecules deposited on the surface. The 1:2 ratio network having melamine in excess has been observed previously but the 1:4 network has not yet been reported. In comparison, the multi-component 3:2 network having PTCDA in excess is a completely new structure.

DOI: 10.1088/0957-4484/21/16/165602
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