3 Nanocrystal Synthesis

3 Nanocrystal Synthesis - Nanocrystal Synthesis Lecture-3...

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Unformatted text preview: Nanocrystal Synthesis Lecture-3 Jan 13, 2009 Upload: Review- Nanocrystals by Alivisatos Review- Monodisperse colloids Review- Ag nanocrystal synthesis Announcement: - Turn in Group Project Preference Form on Jan 20. - Group project can not be on your own research. Dots Rods Tetrapods 50 nm Definition of Nanocrystals? - Shape: sphere, cube, hexagon, disc, rod, branch - Size: sub-100nm - Materials: metal, semiconductor, insulator, oxides. Nucleation Growth Nanocrystals: Nucleation and Growth Solutes (Monomers) Nuclei Nanocrystals Free energy decrease Nucleation Growth Nanocrystals: Nucleation and Growth Solutes (Monomers) Nuclei Nanocrystals Free energy decrease Precursors Surface Volume Total Nucleation Process Nucleation Barrier Free energy change for forming solid particle with radius r nuc : Supersaturated solution r nuc Solid sphere Volume Surface Free energy change per volume Gibbs-Thomson effect I: Prenucleation process II: Nucleation process (as short as possible)....
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This note was uploaded on 06/05/2010 for the course MATSCI 316 taught by Professor Cui,y during the Winter '08 term at Stanford.

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3 Nanocrystal Synthesis - Nanocrystal Synthesis Lecture-3...

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