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

作者：Goodfellow Brian W; Patel Reken N; Panthani Matthew G; Smilgies Detlef M; Korgel Brian A^*

来源：Journal of Physical Chemistry C, 2011, 115(14): 6397-6404.

DOI：10.1021/jp2004908

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 degrees C. As it was heated above room temperature, the superlattice contracted slightly but maintained bcc structure up to 110 degrees C. Once the temperature rose above 110 degrees C, the superlattice began to disorder, by first losing long-range translational order and then local positional order. At temperatures exceeding 168 degrees C, the nanocrystals sintered and oxidized, transforming into PbSeO(3) nanorods.

• 出版日期2011-4-14