Sending report ...Nanotechnology 501 Lecture Series
Electron Emission from Nanoscale Carbon Materials
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Supporting Documents
- Presentation (with audio) (SWF)
- Presentation Slides (PDF, 1.25 Mb)
- Podcast (video) What's this? (MP4, 48.77 Mb)
- Podcast (audio) What's this? (MP3, 28.21 Mb)
Licensed under Creative Commons according to this deed.
| Contributor(s) | Timothy S Fisher Purdue University, West Lafayette |
|---|---|
| Abstract | Prior studies on electron emission show possibly beneficial effects of nanoscale phenomena on energy-conversion characteristics. For example, recent work has shown that the electric field around a nanoscale field emission device can increase the average energy of emitted electrons. We consider here the hypothesis that nanoscale effects can favorably influence the energy-conversion efficiency and capacity of thermionic and field emission emission devices. Required improvements in experimental and computational tools for characterizing such effects include new methods of measuring electron energy distributions (EEDs) from nanoscale emitters and improved modeling of transport between bulk and quantum-confined materials. Recent work on EED measurements reveals indications of quantum confinement, as shown by the multiple peaks in the energy distribution. This talk includes an exposition of the general theories of thermionic and field emission, and representative electron energy distribution measurements and associated simulation results are presented that identify interesting and potentially useful features of thermally excited electron emission phenomena. |
| Biography | Timothy S. Fisher received Ph.D. and B.S. degrees in Mechanical Engineering from Cornell University in 1998 and 1991, respectively. He joined the Purdue’s School of Mechanical Engineering and Birck Nanotechnology Center in 2002 after several years at Vanderbilt University. Prior to his graduate studies, he was employed from 1991 to 1993 as a design engineer in Motorola's Automotive and Industrial Electronics Group. His research has included efforts in simulation and measurement of nanoscale heat transfer, coupled electro-thermal effects in semiconductor devices, nanoscale direct energy conversion, molecular electronics, microfluidic devices, hydrogen storage, and boundary- and finite-element computational methods. His current efforts include theoretical, computational, and experimental studies focused toward integration of nanoscale materials with bulk materials for enhancement of electrical, thermal, and mass transport properties. Applications of his work cover a broad range of areas, including nanoelectronics, thermal interface materials, thermionic and field emitters, biosensors, and hydrogen storage in metal hydrides. |
| Sponsored by | The Birk Nanotechnology Center The Bindley Bioscience Center Purdue Discovery Park The NASA Institute for Nanoelectronics and Computing The Network for Computational Nanotechnology VEECO NCN Student Leadership Council Department of Chemistry Department of Physics School of Chemical Engineering School of Electrical and Computer Engineering School of Mechanical Engineering |
| Cite this work | If you reference this work in a publication, please cite as follows: |
| Date posted | 15 May, 2007 |
| Time | 10:30 AM, April 26, 2007 |
| Location | Birck Nanotechnology Center, Room 1001 |
| Type | Online Presentations |
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9.5 Ranking Series
Part of: Nanotechnology 501 Lecture Series
Nanotechnology 501 Lecture Series
Nanotechnology 501 is a series of lectures designed to provide an introduction to nanotechnology. This series is similar to our popular Nanotechnology 101 series, but directed at the graduate student/professional level.
- 6.7 Ranking Series Part of: Birck Nanotechnology Seminar Series
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