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Melting and Sintering of a Body-Centered Cubic Superlattice of PbSe Nanocrystals Followed by Small Angle X-ray Scattering

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journal contribution
posted on 14.04.2011, 00:00 by Brian W. Goodfellow, Reken N. Patel, Matthew G. Panthani, Detlef-M. Smilgies, Brian A. Korgel
The structural evolution of a body-centered cubic (bcc) superlattice of 6.6 nm diameter organic ligand-coated PbSe nanocrystals was studied in situ by small-angle X-ray scattering (SAXS) as it was heated in air from room temperature to 350 °C. As it was heated above room temperature, the superlattice contracted slightly but maintained bcc structure up to 110 °C. Once the temperature rose above 110 °C, the superlattice began to disorder, by first losing long-range translational order and then local positional order. At temperatures exceeding 168 °C, the nanocrystals sintered and oxidized, transforming into PbSeO3 nanorods.