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Exploration of Nanoparticles

Exploration of Nanoparticles. Steven Hershman under Dr. Chris Murray Department of Chemistry. Contents. Introduction to nanoparticles? How do you make large nanostructures? How can computers aid in research? Summary. Contents. Introduction to nanoparticles?. Nanoparticles.

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Exploration of Nanoparticles

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  1. Exploration of Nanoparticles Steven Hershman under Dr. Chris Murray Department of Chemistry

  2. Contents • Introduction to nanoparticles? • How do you make large nanostructures? • How can computers aid in research? • Summary

  3. Contents • Introduction to nanoparticles?

  4. Nanoparticles • Particles < 100 nm • Quantum Confinement • 1st approximation: http://cats.about.com/od/catpictures/ig/ContainerCats/pippinbox400x533.htm

  5. Band Theory Bandgap for Quantum Dot

  6. Interesting Nanoparticle properties • Quantized energy levels • Tunable bandgap • Tunable Optics • Coulomb blockade • Other cool stuff!

  7. Tunable bandgap Particle-in-a-Box Like term for Quantum Confinement Electrostatic attraction between valance and conductance band

  8. Tunable optics http://content.answers.com/main/content/wp/en/thumb/6/69/395px-Fluorescence_in_various_sized_CdSe_quantum_dots.png

  9. Coulomb blockade • Energy to add an electron: < kT it can’t spontaneously happen!  Single electron transistor Capacitance of spherical particle

  10. Other Cool Stuff! • Multiple carrier excitation • Next generation solar cells • Nonlinear optics • Goodbye Beer’s law • Applications • Change light intensity • Change wavelength • Faster optical switches

  11. Contents • How do you make large nanostructures?

  12. A DNA analogy Generating a synthetic genome by whole genome assembly:   X174 bacteriophage from synthetic oligonucleotides

  13. Oriented attachment • Ligation for nanoparticles R. Lee Penn and Jillian F. Banfield "Imperfect Oriented Attachment: Dislocation Generation in Defect-Free Nanocrystals" Science 281 (5379) : 969-971. (1998) (in Reports)

  14. Contents • How can computers aid in research?

  15. Modeling Exotic-Shaped Nanoparticles

  16. Quickly apply theory

  17. And try to match it with experiment…

  18. But lab is still being constructed

  19. Thanks: • Dr. Chris Murray • Dr. Doug Yates • Christine Eklund • Roy Vagelos

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