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#431 – An Interview with Adam McCombs
Welcome, Adam McCombs! Check out his talk at Supercon and the associated article on Hackaday.com
- Scanning electron microscope
- 0h 0m 45s
- 2017 got the first microscope
- 0h 1m 10s
- Dan Burrard STM microscopes
- 0h 1m 43s
- @Nanographs
- 0h 2m 28s
- Vacuum is shockingly challenging
- 0h 2m 46s
- Air stops behaving like a liquid
- 0h 3m 57s
- Turbomolecular pumps
- 0h 4m 16s
- 14.4 atm
- 0h 5m 24s
- turbo pump looks like a turbine
- 0h 6m 41s
- Roughing pump can get 10^-3 torr
- 0h 8m 2s
- Thermionic emission gun
- 0h 8m 54s
- Tungsten filament
- 0h 9m 3s
- Magnetic lenses
- 0h 9m 52s
- Electron detector
- 0h 11m 0s
- Uses 400V to attract electrons towards the phospher
- 0h 11m 13s
- Older systems needed higher energy electrons
- 0h 12m 13s
- You can melt things in an electron microscope
- 0h 13m 26s
- Electron-beam welder
- 0h 14m 14s
- Cutting edge is wet samples
- 0h 15m 18s
- Most things in SEMs are dead
- 0h 15m 28s
- Newest semiconductors is 7-14 nm
- 0h 17m 33s
- Optical vs SEM with Depth of Focus (DOF)
- 0h 18m 50s
- Preparing the sample generally has to be conductive
- 0h 19m 41s
- Non-conductive things are usually coated in gold
- 0h 20m 26s
- Gold coated cheerio
- 0h 21m 24s
- Thickness of the sputter depends on needs: thicker is less coating
- 0h 22m 38s
- Angstroms vs nanometers
- 0h 23m 37s
- SEM vs STM vs TEM
- 0h 27m 28s
- SEM images the surface of things
- 0h 27m 39s
- STM transmits electrons through the sample
- 0h 27m 49s
- imaging bonds requires an atomically thin sample
- 0h 28m 51s
- can image magnetic fields with a TEM
- 0h 31m 30s
- can to tomography if you image things in sequence
- 0h 31m 55s
- Learned about the brain project from Allen Institute
- 0h 33m 51s
- Scanning tunneling electron microscope (stm)
- 0h 34m 49s
- Doesn’t operate at vacuum
- 0h 35m 6s
- “Coarse approach done, now to bring it in to quantum tunneling range to start scanning. I always love when we can leverage quantum effects using tools you can just build out of parts from the hardware store, eBay, and digikey.”
- 0h 36m 22s
- SEM is for surface science
- 0h 37m 28s
- TEM is used for things like asbestos
- 0h 38m 5s
- Also used for histology (telling if a sample has a virus)
- 0h 38m 57s
- STMs are more specialized – atomic resolution of the surface of a sample
- 0h 40m 27s
- Fundamental material research
- 0h 40m 47s
- IBM video “The boy and his atom”
- 0h 41m 8s
- Multiframes is possible but resolution goes down
- 0h 41m 46s
- Similar to a camera with different exposure
- 0h 41m 58s
- Ben Krasnow videos
- 0h 44m 6s
- First scope was “some assembly required”
- 0h 45m 13s
- Most o-rings are viton – silicon based
- 0h 46m 8s
- ISI super 3A
- 0h 46m 42s
- Jeol 35C
- 0h 47m 4s
- VacuumHackers.com
- 0h 49m 9s
- Digital capture isn’t normally included
- 0h 51m 47s
- Polaroid film holder to capature images
- 0h 52m 53s
- Now doing this for a business as well
- 0h 54m 11s
- Repairs, consulting, moving
- 0h 55m 4s
- Might be recreating old parts
- 0h 55m 27s
- Might be manufacturing heavy and creating parts that enables new pieces
- 0h 55m 36s
- The materials of these hasn’t changed much over the years
- 0h 57m 20s
- Column is usually made out of iron
- 0h 59m 40s
- Electronics usually aren’t the problem
- 1h 0m 36s
- Philips manuals are really detailed
- 1h 2m 9s
- Manuals for older things are non existent
- 1h 2m 21s
- Example of a common failure: beam jumping around
- 1h 3m 1s
- RAM failure on a jeol 1200
- 1h 4m 48s
- Working with high voltage
- 1h 6m 1s
- High voltage tank
- 1h 7m 53s
- Putting the electronics into oil
- 1h 8m 34s
- xray safety is a big concern in TEMs with 120kV+ electrons
- 1h 9m 39s
- Multiple geiger counters (thin window)
- 1h 10m 11s
- Follow along on @nanographs
- 1h 14m 31s
- VacuumHackers.com
- 1h 14m 57s
- nwnlabs.org
- 1h 16m 20s
- (Not mentioned during the show) Adam will be at M&M conference in Portland this year