2004

NanotechnologyV 1505 Preparation and Characterization of Monodisperse PbSe Semiconductor Nano-

crystals in a Noncoordinating Solvent. — Spherical PbSe semiconductor nanocrys-tals with near-infrared absorption of 1100—2520 nm (corresponding to diameters of 3—13 nm) are synthesized from PbO and Se=P(-(CH2)7-Me)3 in 1-octadecene (180→150 °C). The as-prepared PbSe semiconductor nanocrystals have very narrow size distribution without any postsynthetic size selection. High-resolution transmission electron microscopy, electron diffraction, and X-ray diffraction show that the nanocrys-talline particles are single domains of rock-salt type PbSe. A water-soluble form of these materials is generated by simple surface treatments. — (YU, W. W.; FALKNER, J. C.; SHIH, B. S.; COLVIN*, V. L.; Chem. Mater. 16 (2004) 17, 3318-3322; Dep. Chem., Rice Univ., Houston, TX 77005, USA; Eng.) — Schramke

43- 230