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Nanoparticles: A Brief Overview

Nanoparticles: A Brief Overview. What are they? How do we characterize them? Why are we interested?. solid state. molecular. Nanoparticles: What are they?. Nanoparticles are small elemental ensembles (typically on the nanometer scale). They often have unique properties due to the

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Nanoparticles: A Brief Overview

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  1. Nanoparticles: A Brief Overview • What are they? • How do we characterize them? • Why are we interested?

  2. solid state molecular Nanoparticles: What are they? Nanoparticles are small elemental ensembles (typically on the nanometer scale). They often have unique properties due to the fact that they are do not exhibit the characteristics of the bulk or individual particles.

  3. molecular precursor nanoparticle Synthesis Typically, the synthesis of nanoparticles is performed by reducing metal salts in various ways (electrodeposition, thermolysis, photochemistry, and chemically). Other methods include vapor synthesis as well as reduction of organometallic precursors at high temperatures (typically in H2 atmosphere).

  4. nanoparticle Characterization X-Ray Absorption Spectroscopy Microscopy • Provides information on: • particle size • particle composition • (energy dispersive x-ray analysis) • Provides shell structure information: • nearest neighbors • bond distances

  5. Why are we interested? • Nanoparticles are of interest for various reasons. • Fundamental perspective • Allows for study of the the transition from • bulk properties to those of molecular clusters • Practical perspective • Possible application in advanced materials • (quantum dots, etc.) • Catalysis applications (due to their small size and • increased surface areas)

  6. 8 N = 4096 n = 1352 N = 4096 n = 2368 8 N = 4096 n = 3584 N = total atoms; n = surface atoms Surface Area One intrinsic benefit is the increased surface area available in nanoparticles.

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