Exploration of Nanoparticles
description
Transcript of Exploration of Nanoparticles
![Page 1: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/1.jpg)
Exploration of Nanoparticles
Steven Hershmanunder
Dr. Chris MurrayDepartment of Chemistry
![Page 2: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/2.jpg)
Contents
• Introduction to nanoparticles?
• How do you make large nanostructures?
• How can computers aid in research?
• Summary
![Page 3: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/3.jpg)
Contents
• Introduction to nanoparticles?
![Page 4: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/4.jpg)
Nanoparticles
• Particles < 100 nm
• Quantum Confinement– 1st approximation:
http://cats.about.com/od/catpictures/ig/ContainerCats/pippinbox400x533.htm
![Page 5: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/5.jpg)
Band Theory
Bandgap for Quantum Dot
![Page 6: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/6.jpg)
Interesting Nanoparticle properties
• Quantized energy levels
• Tunable bandgap
• Tunable Optics
• Coulomb blockade
• Other cool stuff!
![Page 7: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/7.jpg)
Tunable bandgap
Particle-in-a-Box
Like term for Quantum Confinement
Electrostatic attraction between valance and conductance band
![Page 8: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/8.jpg)
Tunable optics
http://content.answers.com/main/content/wp/en/thumb/6/69/395px-Fluorescence_in_various_sized_CdSe_quantum_dots.png
![Page 9: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/9.jpg)
Coulomb blockade
• Energy to add an electron:
< kT it can’t spontaneously happen!
Single electron transistor
Capacitance of spherical particle
![Page 10: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/10.jpg)
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
![Page 11: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/11.jpg)
Contents
• How do you make large nanostructures?
![Page 12: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/12.jpg)
A DNA analogy
Generating a synthetic genome by whole genome assembly: X174 bacteriophage from synthetic oligonucleotides
![Page 13: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/13.jpg)
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)
![Page 14: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/14.jpg)
Contents
• How can computers aid in research?
![Page 15: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/15.jpg)
Modeling Exotic-Shaped Nanoparticles
![Page 16: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/16.jpg)
Quickly apply theory
WAXD
0
500000
1000000
1500000
2000000
2500000
3000000
10 20 30 40 50 60 70 80 90 100 110 120 130
2theta
I
![Page 17: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/17.jpg)
And try to match it with experiment…
![Page 18: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/18.jpg)
But lab is still being constructed
![Page 19: Exploration of Nanoparticles](https://reader035.fdocuments.us/reader035/viewer/2022070408/56814406550346895db09ae7/html5/thumbnails/19.jpg)
Thanks:
•Dr. Chris Murray
•Dr. Doug Yates
•Christine Eklund
•Roy Vagelos