Developing simple synthetic methods to controlthe size and morphology of nanocrystals (NCs) is an active area of research asthese parameters control the material's electronic and optical properties. Fora semiconductor with a symmetrical crystal structure such as lead selenide,anisotropic colloidal growth has been previously accomplished via the use of templates,seeds, or by block assembly of smaller, symmetrical subunits. Here, we presenta simple method to create mono-disperse lead selenide nanorods, branchednanorods, and crosses at low temperatures. The size distribution and the observedmorphologies are consistent with a continuous, anisotropic growth of material.We propose that these observations are due to a previously unobserved mechanismof nanocrystal growth were the electrostatic polarity of a NC directs thereaction kinetics.

Shape controlled colloidal synthesis of rock-salt lead selenide nanocrystals

240th National Meeting (2010)

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