Abstract
As-synthesized 3.5-nm sphalerite CdS was hydrothermally coarsened in a series of Na2S solutions at 150 °C, aiming to understand the effect of the Na2S additive on the growth and phase-transition mechanisms. X-ray diffraction (XRD) data indicate that, with increasing Na2S concentration, both the growth rate and the ratio of wurtzite CdS increase. Moreover, high-resolution transmission electron microscopy (HRTEM) data reveal that, in contrast to the regular surface nucleation mode in aqueous solution, the new wurtzite phase of CdS in Na2S solution appears in the interior regions of crystal, and the interfacial nucleation mode greatly promotes the generation of the wurtzite-type structure. The oriented-attachment (OA) mechanism during growth was found to contribute to the unique mode of phase transformation. We propose that the strong interfacial adsorption effect of Na2S promotes the growth of CdS via the OA mechanism and the OA-mediated phase transformation.
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