Abstract

Optical properties of cadmium sulfide nanowires of 50100nm diameter prepared by the pulsed-laser vaporization method have been studied using photoacoustic, UV-Vis, Raman, and photoluminescence spectroscopy. The photoacoustic (PA) technique yielded clean spectra with a steeper absorption edge for as-prepared opaque semiconducting CdS nanowires when compared to the corresponding con ventional optical absorption spectra. The PA signal intensity was also significantly higher for nanowires. The Raman spectrum revealed increased exciton–longitudinal-optical-phonon coupling. The appearance of a narrow photoluminescence peak at 491nm (FWHM 9nm) and the absence of emission above 500nm demonstrate the high quality of nanowires. High-resolution transmission electron microscopy showed excellent ordering of the atoms in the [001] planes perpendicular to the growth direction.

© 2009 Optical Society of America

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