Figure 1

Schematic illustration of the formation of (a) 111, (b) 212 and (c) 222 Au NAs, respectively. Wherein, 1 and 2 mean ssDNA strand number conjugated to Au NP. The concentration ratios of three Au–DNA conjugates are (a,c) 1:1:1 and (b) 1:2:1 for assembling Au NAs, respectively.