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Cross section

Shell

Shell

Figure 7. Synthesis of core-shell nanowires by chemical vapor deposition. (a) Gaseous reactants (red) catalytically decompose on the surface of Au nanocluster leading to nucleation and direct nanowire growth. (b) One-dimensional growth is maintained as reactant decomposition on the Au catalyst is strongly preferred. (c) Synthetic conditions are altered to induce homogeneous reactant decomposition on the nanowire surface, leading to a thin, uniform shell (blue). (d) Multishells are grown by repeated modulation of reactants. Reprinted with permission from [143], L. J. Lauhon et al., Nature 420, 57 (2002). © 2002, Macmillan Magazines Ltd.

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Distance (nm)

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