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The adsorption of two kinds of porphyrin (Cu-TBPP) and perylene (PTCDA)derived organic molecules deposited on KBr and Al2O3 surfaces has been studiedby non-contact force microscopy in ultra-high vacuum, our goal being theassembly of ordered molecular arrangements on insulating surfaces at roomtemperature. On a Cu(100) surface, well ordered islands of Cu-TBPP moleculeswere successfully imaged. On KBr and Al2O3 surfaces, it was found that the samemolecules aggregate in small clusters at step edges, rather than formingordered monolayers. First measurements with PTCDA on KBr show thatnanometre-scale rectangular pits in the surface can act as traps to confinesmall molecular assemblies

Cu-TBPP and PTCDA molecules on insulating surfaces studied by ultra-high-vacuum non-contact AFM