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(Color online) (a) SEM image of CdS nanowires. (b) TEM image of a CdS nanowire. The inset shows the SAED pattern. (c) The polarized Raman spectra of a single nanowire and bulk ribbon at room temperature. Inset is the optical image of measured CdS nanowire. Scale bar is . (d) The schematics of experimental setup.
(Color online) (a) The absorption spectrum of CdS nanowires and bandedge emission spectrum of single nanowires. Arrows denote the energies of excitation laser for Raman measurements. (b) The Raman spectra of a single nanowire with different excitation energies.
(Color online) The typical orientation-dependent resonance Raman spectroscopy of (a) a single nanowire and (b) a bulk ribbon excited by laser. The peak at (a) correspond to the Si substrate. denotes the angle between the long axis of nanowire (also axis) and the laser polarization.
(Color online) Angular dependences of 2LO/LO of three nanowires (up and down triangles, squares) and bulk ribbon (circles).
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