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We report here on a detailed study on PbS colloidal quantum dots. A characterization via X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) allowed us to reliably determine the diameter and the shape of the nanocrystals. These data, together with second-derivative analysis of the absorption spectra, allowed us to determine the size dependence of seven transitions in the absorption spectrum; some of these transitions were identified on the basis of their normalized confinement energy. The size dependence of the first excitonic transition was best modeled by a four-band envelope approach which considers the anisotropy of the band edges (Andreev, A. D.; Lipovskii, A. A. Phys. Rev. B:  Condens. Matter Mater. Phys. 1999, 59, 15402−15404). The extinction coefficients were calculated using concentrations obtained from inductively coupled plasma atomic emission spectrometry …
American Chemical Society
Publication date: 
9 Aug 2006

Ludovico Cademartiri, Erica Montanari, Gianluca Calestani, Andrea Migliori, Antonietta Guagliardi, Geoffrey A Ozin

Biblio References: 
Volume: 128 Issue: 31 Pages: 10337-10346
Journal of the American Chemical Society