There has been significant interest in the development of multicomponent nanocrystals
formed by the assembly of two or more different materials with control over size, shape,
composition, and spatial orientation. In particular, the selective growth of metals on the tips of
semiconductor nanorods and wires can act to couple the electrical and optical properties of
semiconductors with the unique properties of various metals. Here, we outline our progress on the
solution-phase synthesis of metal-semiconductor heterojunctions formed by the growth of Au, Pt, or
other binary catalytic metal systems on Cd- and Pb-calcogenide nanocrystals.