Selective growth of metal and binary metal tips on CdS nanorods Academic Article uri icon

abstract

  • Figure 1 shows the selective growth of Pt nanoparticles (4.3 nm) on CdS nanorods (120 nm × 4 nm). The anisotropic wurtzite crystalline structure of the CdS allows for selective chemistry on different facets. The reactivity of the nanorods is higher at the tips than along the body of the rod due to the increased surface energy, which also leads to preferential growth along the 〈001〉 axis of the CdS rods, as can be seen in the transmission electron microscopy (TEM) image in Figure 1A. During the early stages of Pt growth, or at a low Pt concentration, Pt deposition appears to occur preferentially on one tip of the rods (Figure 1B). This can be understood by considering the distribution of Cd and S along the 〈001〉 axis. The lattice planes along the axis are alternately composed of either Cd or S atoms, which makes growth at earlier stages more favorable on the S rich facets. Alternatively, due to the considerable length of the CdS …

publication date

  • March 1, 2008