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Nanoparticle Surface Characterization by X-Ray Photoelectron Spectroscopy

Nanoparticle Surface Characterization by X-Ray Photoelectron Spectroscopy. http://www.phi.com/Interface/PHI%20Interface%20Spring%2005.pdf. What is Nanotechnology?. Nano = 10 -9. Nanoscale science: investigates the properties of matter in the critcal range of 1nm – 100 nm.

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Nanoparticle Surface Characterization by X-Ray Photoelectron Spectroscopy

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  1. Nanoparticle Surface Characterization by X-Ray Photoelectron Spectroscopy http://www.phi.com/Interface/PHI%20Interface%20Spring%2005.pdf

  2. What is Nanotechnology? Nano = 10-9 Nanoscale science: investigates the properties of matter in the critcal range of 1nm – 100 nm. Nanotechnology: Is building and using devices from 1 nm – 100 nm.

  3. What Leads to Unsual Properties? • Any solid or liquid has 2 components: • surface • bulk

  4. The Macroscopic Case One drop of water: 100,000 bulk molecules per 1 surface molecule

  5. Another Example... • 2 surface layers vs. ~10,000,000 internal layers • 2 surface layers vs. ~5,000,000 internal layers • Percentage of surface: • 0.000002% vs 0.000004%

  6. Shrinking Down to the Nanoscale C60 5% 100% 10% Properties of surface atoms/molecules now affect the overall properties. 50%

  7. Properties Change According to Size! Different sizes of gold particles = different optical properties.

  8. Nanoparticle Surfaces: What’s the Problem? • Nano is all about surface! • Surfaces are thin. • Most surface coatings are organic. Boyen, H.-G.; Kastle, G.; Weigl, F. et al. Science2002, 297, 1533-1536.

  9. XPS: How Does it Work? ejected electron KEelectron = hX-ray – BEelectron X-Ray http://www.almaden.ibm.com/st/scientific_services/materials_analysis/xps/

  10. XPS Spectrometer: Basic Components Settle, F., ed. Handbook of Instrumental Techniques for Analytical Chemistry. Prentice Hall. 1997.

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