We prepared metallic-nanoparticle-embedded one-dimensional titanium dioxide (1D-TiO 2 ) via a one-step electrospinning process, in which Au or Ag metallic nanoparticles between 5 and 10 nm in diameter were incorporated within the TiO 2 nanofibers. After calcination of the composite nanofibers at high temperature of 450 °C, the nanofibers were converted to 1D-TiO 2 by the thermal decomposition of polyvinylpyrrolidone (PVP). This process simultaneously changed the metal precursors (AgNO 3 or HAuCl 4 • 3H 2 O) to metallic nanoparticles (Ag or Au) to produce 1D-TiO 2 nanofiber composites

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The controlled precipitation of a supersaturated Cd2+ solution is used to selectively deposit Cd(OH)2 nanowire bundles on a substrate. As schematically depicted in the figure, when the Cd2+ ionic product exceeds the solubility product, heterogeneous and homogeneous nucleation occur independently on the substrate and in the solution to give nanowire bundles and hexagonal plates, respectively.

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