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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
Added this to my FAVORITES!!!! Great show!
Even with my SEMs experience I learned a lot. I know many folks who will also find great benefit in listening to this podcast episode. I will being sending them all a link to this show.
Last spring a friend and I made radical changes to a JEOL 6490 to enable EBSD measurement of highly radioactive materials. This project was my first deep dive into SEMs and fortunately the company we contracted with to develop this design provided a full two day deep training with Oxford Instruments, which filled in all the knowledge gaps we had to be able to operate, modify and full test the 6490.
I have been looking for a great FPGA project and I think you just gave me an awesome idea!
Thank you Adam and Chris for an awesome show!
Made a mistake above – I meant EDS detector, not EBSD. EDS = Energy Dispersive Spectrometer – we used the EDS to characterize materials by the emitted characteristic xrays.
We used to the EBSD (Electron Back Scatter Diffraction detector) to examine the material microstructure in collaboration with the EDS maps.
Adam,
Is it possible to see nano-carbon tubes with an electron microscope?
Any thoughts on the documentary ‘Patient 17’ where they use an electron microscope to remove an alien implant?
Thanks!
Here is a Philips EM (looks like a TEM, I think) for a bid of $50 (as of 10-Mar-2019) in Richmond VA. Unfortunately the model plate photo is blurry.
https://www.govdeals.com/index.cfm?fa=Main.Item&itemid=2827&acctid=3954
I’m giving a talk at this university tomorrow but will restrain myself from arranging a viewing, it’s a bit too large for me to acquire. Instead I am considering building a STM thanks to this podcast.
In the 1980s I evaluated SEMs for my company and purchased an ElectroScan ESEM. Looks like there is quite a history on that type of SEM:
http://www.danilatos.com/response_to_robinson.htm