Abstract
This manuscript studies the impact of extruding hairpins on two-dimensional self-assembly of DNA tiles on solid surface. Hairpins are commonly used as tomographic markers in DNA nanostructures for atomic force microscopy imaging. In this study, we have discovered that hairpins play a more active role. They modulate the adsorption of the DNA tiles onto the solid surface, thus changing the tile assembly kinetics on the solid surface. Based on this discovery, we were able to promote or slow down DNA self-assembly on the surface by changing the hairpin locations on the DNA tiles. This knowledge gained will be helpful for the future design of DNA self-assembly on surface.