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 –1 st 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