Laser-Induced Fabrication of Au@CdS Core−Shell Nanowires

Au@CdS core−shell nanowires have been fabricated readily by exciting the surface-plasmon resonances of gold nanospheres, which were priorly connected to each other by 1,5-pentanedithiol (PDT) and coated with CdS, using picosecond laser pulses at room temperature. Gold nanospheres were cross-linked by PDT molecules to form gold nanostrands, which were then fixated and protected by CdS shells to yield Au@CdS core−shell nanocomposites. The irradiation of the nanocomposites loaded on a grid of transmission electron microscopy with 532 nm pulses of 30 ps has produced Au@CdS core−shell nanowires. The thermalized photon energy of surface-plasmon excitation has induced gold nanospheres to fuse together within CdS shells.