Figure 5: Stepwise walking on 3D DNA origami.
(a) Schematic of the plasmonic walker on a 3D triangular prism DNA origami platform. The walking track comprises seven rows of footholds (A–G) extended from the origami surface to define six walking stations (I–VI). The walking process starts at station I, where the walker and the stator form a right-handed configuration. The distances between the neighbouring stations are slightly different owing to the irregular side surfaces of the 3D origami. The successive step sizes are ∼7, 7, 12, 12 and 11 nm. (b) Measured CD spectra and corresponding TEM images of the plasmonic walker structures at different stations. The frame size of each TEM image is 80 nm. The plasmonic structures display certain deformation due to the drying process on the TEM grids.
