Matches in UGent Biblio for { ?s ?p PbSe quantum dots with sizes of 2.8(1), 3.7(1), and 6.2(1) nm, freely suspended in solution, have been studied by high-energy x-ray diffraction coupled to atomic pair-distribution-function analysis and computer simulations. The atomic-scale structure of the quantum dots is best described by 371-, 763-, and 4084-atom configurations, respectively, that are substantially off-stoichiometric and structurally distorted. It is argued that such finite-size, "large-molecule-type" structure models and not quasi-infinite ones based on periodic crystalline lattices are better to be used when the properties of a few nanometer-sized materials, in particular, those of PbSe quantum dots, are to be explained in full detail.. }
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- aggregation abstract "PbSe quantum dots with sizes of 2.8(1), 3.7(1), and 6.2(1) nm, freely suspended in solution, have been studied by high-energy x-ray diffraction coupled to atomic pair-distribution-function analysis and computer simulations. The atomic-scale structure of the quantum dots is best described by 371-, 763-, and 4084-atom configurations, respectively, that are substantially off-stoichiometric and structurally distorted. It is argued that such finite-size, "large-molecule-type" structure models and not quasi-infinite ones based on periodic crystalline lattices are better to be used when the properties of a few nanometer-sized materials, in particular, those of PbSe quantum dots, are to be explained in full detail.".