Abstract
Long and flexible crystalline CdS nanowire ropes were synthesized in bulk quantities via a simple aqueous chemical growth route, which has previously been successful for the growth of short CdS nanorods. The as-grown CdS nanoropes exhibit a unique helically twisted structural feature, as confirmed by both microscopic observation and circular dichroism spectroscopic characterization. The nucleation and growth kinetics of these related CdS one-dimensional(1D) nanocrystals was investigated by monitoring the temporal evolution of the UV-visible spectrum. It was found that cadmium and sulfide monomers were first nucleated out as “magic number” CdS nanoclusters in the initial nucleation stage, and then grew to regular sized CdS 1D nanocrystals during the subsequent Ostwald ripening process.
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