Lecture 9 - NP synthesis

Lecture 9 - NP synthesis - MSE 803: N ANOMATERIALS AND N...

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Unformatted text preview: MSE 803: N ANOMATERIALS AND N ANOTECHNOLOGY Professor Xudong Wang 213 MSE Building Spring 2010 Class 9: Chemical Synthesis Protocols for Nanoparticles 1. Metal Compound Positively charge metal salt, or Metal centers of complexes 2. Solvents (depends on the nature of the salt) Water Polar and Non-polar organic solvents 3. Reducing agent (determined by the nature of the metal compound) Gaseous hydrogen Hydridic compounds Reducing organics, e.g. alcohols ---- Many others 4 . Stabilizers: Stabilizing agents/ligands/capping agents/passivating agents Prevent uncontrollable growth of particles Prevent particle aggregation Control growth rate and particle size Allows particle solubility in various solvents Synthetic Approaches for Metal and Semiconductor Nanoparticles G. Cao, Nanostructures & Nanomaterials, Imperial College Press (2003) Synthesis of Metallic Nanoparticles The reduction of metal complexes in dilute solutions is the most general method for synthesis of metal colloidal dispersions A wide variety of methods Most common method combines a low concentration of solute and polymer monolayer adhered to the growth surface both mechanisms hinder diffusion of growth species to growth surface thus diffusion becomes the rate limiting step for subsequent growth of initial nuclei This results in the formation of uniformly sized nanoparticles List of precursors, reduction agents and polymer stabilizers commonly used in metallic NP synthesis given next Elemental metals, inorganic salts & metal complexes Sodium citrate, hydrogen peroxide, hydroxylamine hydrochloride, citric acid aqueous methanol ..etc Polyvinyl alcohol & sodium polyacrylate Synthesis of Metallic Nanoparticles Precursors, reduction agents & polymer stabilizers for metallic NP synthesis + + + + + + Add electron donor Metal cations in solution Ligand molecules ( ) Metal atoms in solution Cluster formation Isolation in solid form Obane, WMU Schematic Procedure for Cluster Synthesis + + + + + + Add Ligand molecules ( ) Metal cations in solution Add electron donor + + + + + + Stabilized Metal particles in solution...
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Lecture 9 - NP synthesis - MSE 803: N ANOMATERIALS AND N...

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