Abstract
In recent years, much progress has been made in aperiodic ordered surface structures such as fractal and quasicrystal that can be synthesized by molecular self-assembly. Here we review the research progress of Sierpinski triangle fractal structures and quasicrystal structures on metal surfaces investigated by scanning tunneling microscopy. Constructions of Sierpinski triangle fractals with halogen, hydrogen, coordination and covalent bonds were realized on different basal surfaces via changing the precursor types, and complete fifth-order fractals were successfully prepared by a combination of the templating and co-assembly methods overcoming the surface kinetic limitations. Surface molecular quasicrystals were fabricated by utilizing the hydrogen bond between carboxylic acid groups through molecular self-assembly for the first time, and metal-organic coordination quasicrystals were successfully prepared by the coordination between organic molecule and rare-earth atoms.
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