Embed Size (px)
Citation preview
2 August 2007 Jon Brame
A SWNT based Nanocompass for High Spatial Resolution
Magnetometry
Jon Brame, Johnathan Goodsell
Presented by Bryan Hicks
Brigham Young University
NASA GSFC Code 541
ESMD Student-Faculty Program
2 August 2007 Jon Brame
Overview
1. Project Motivation and Goal
2. Fabrication Process
3. Outcomes
2 August 2007 Jon Brame
CNT Properties• Change in Conductivity with Strain
– Tombler, et al
(Nature, 2000)– Single tube
2 August 2007 Jon Brame
CNT Properties• Change in Conductivity with Strain
– Tombler, et al
(Nature, 2000)– Single tube
2 August 2007 Jon Brame
Motivation
• Space Magnetometry– Spacecraft Orientation– Magnetic Field Studies
• Planetary Exploration– Astronaut/Rover
Orientation– Planetary Geology
2 August 2007 Jon Brame
Device Operation
2 August 2007 Jon Brame
Prototype
2 August 2007 Jon Brame
Process: Catalyst
• Indirect Iron Catalyst Deposition
Vacuum Chamber for Thin Film Deposition
2 August 2007 Jon Brame
Process: SWCNT Growth
• Chemical Vapor Deposition (CVD) SWCNT Growth
CVD Growth Furnace
Diagram of CVD Growth Process
SEM Image of SWCNT Mat
2 August 2007 Jon Brame
Process – Electrical Contact
• Gold Contact Pads– Detector Development Lab (DDL)– E-Beam Lithography– Deposition: Chrome(100Å)-
Gold(1000Å)– Lift-off
2 August 2007 Jon Brame
Process – Iron Needle
• Iron Needle– Device Alignment– E-Beam Lithography pattern– Deposition: Chrome-Iron-
Chrome– Lift-off
Diagram of SWCNT network, contact pads and iron needle
2 August 2007 Jon Brame
Process – Trench• Lithography
(manual)
• Etching– Buffered
Oxide Etch– KOHDiagram of completed device
Au
Au
SWCNTs
Remnantneedle
Trench
2 August 2007 Jon Brame
Results
• Completed Magnetometer Prototype
Successfully etched trench with SWCNT spanning gap between gold electrodes
2 August 2007 Jon Brame
Results
• Magnetic Field Measurement Testing
2 August 2007 Jon Brame
Outcome: BYU Collaboration
• Growth at BYU
• Clean Room Class
• Refinement of Growth Process
• Photomasks for Rapid Device Fabrication
Growth results reproduced at BYU. (approx mag=50Kx)
2 August 2007 Jon Brame
Acknowledgements
• Dr. Stephanie Getty and NASA Goddard Space Flight Center code 541
• Dr. David Allred: BYU Physics Dept.• Bryan Hicks, Rachel Bis, Melissa Harrison• Branch 541: Dewey Dove, Bruno Munoz, Carl Taylor,
Len Wang• Division 540; Dick Fahey; Joshua Halpern; ESMD;
Rocky Mountain Space Grant Consortium • BYU: Dr. Richard VanFleet, Dr. Jeffrey Farrer, Dr.
Robert Davis, David Hutchinson• Other: Lynda Goodsell, Bill Heaps
