B

A

Figure 9. Synthesis of nanowire superlattices. (a) Nanocluster catalyst (gold) nucleates and directs one-dimensional semiconductor nanowire (blue) growth with the catalyst remaining at the terminus of the nanowires. (b) Upon completion of the first growth step, a different material (red) can be grown from the end of the nanowire. (c) Repetition of steps a and b leads to a compositional superlattice within a single nanowire. Reprinted with permission from [14], M. S. Gudiksen et al., Nature 415, 617 (2002). © 2002, Macmillan Magazines Ltd.

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