One-dimensional structures have recently attracted huge attention due to their fine properties in photonics,electronics and optics.Cadmium sulfide is a n-type direct band gap semiconductor (2.4eV) which can be used as important building blocks to assemble a wide range of structures,including light-emitting diodes (LEDs),waveguides,lasers and quantum dot-sensitized solar cells.These key properties can,in principle,be varied during growth,and thus the development of synthetic methods that enable their precise control is expected to have a significant impact.Cadmium sulfide one-dimensional structures have been obtained either by the laser-assisted catalytic or vapor-phase growth method.Here we report the synthesis of cadmium sulfide structures by a simple,fast and inexpensive chemical vapor deposition (CVD) method.Structural characterization by both SEM and TEM reveals that the CdS nanostructures synthesized are highly uniform single crystals.By tuning gas flow,chamber pressure and deposition temperature,various cadmium sulfide nanostructures can be successfully obtained,with exceptional optical properties.By two-beam bright-field dark-field TEM and twist contour analysis we found that the growth of CdS nanowires and nanoribbons might be driven by screw-dislocation.