cascode
@kara @mona interesting, i'm more worried about getting the speed/time/concentration/volume in the right range to get a usable film, esp. given my lack of any way to measure thickness afterwards unless i can figure it out from resistance per square (...which i think i should really look into)
Mar 29, 2018 at 6:54amWeb
Show threadcascodeMar 29, 2018
@kara @mona i'm hoping particulates just hurt my yield without ruining literally everything, i guess
Show threadBrian PoeMar 29, 2018

@cascode @[email protected] @[email protected] How thick do you want the film? Is it compressible?

I used to build glass, thin plastic, and #PDMS #microfluidic devices. I used a micrometer hand tool, an interferometer, a fluorescence method, and a low tech optical microscopy method. Never quite mastered any method, but perhaps I could help.

Also... what are you trying to make? :)

Show threadcascodeMar 29, 2018
@brianpoe @kara @mona trying to make organic thin-film transistors without using any proper fab equipment
Show threadcascodeMar 29, 2018
@brianpoe @kara @mona so basically, as thin as possible. thinner film -> better on/off ratio, from what i can tell
Show threadcascodeMar 29, 2018
@brianpoe @kara @mona (ideally less than 1um)
Show threadBrian PoeMar 29, 2018

@cascode @[email protected] @[email protected] I see. That's thinner than I've ever worked with, but my old lab manager found a way to make nanochannels in an improvised cleanroom in an office building. "Low cost" "rapid prototyping" "nanochannel" and "thin film" might bear fruit in Google Scholar. (SciHub is a thing ;) )

Your electrical resistance method sounds like a good approach. Optical may be tricky due to how thin the film would be.

Certainly not hopeless!

Show threadBrian PoeMar 29, 2018

@cascode @[email protected] @[email protected] Very cool! #AppropriateTechnology meets high technology. Improvised tech is more powerful than it seems.

Honestly, I think our current microelectronics fabrication methods and supply chain are deeply unsustainable.

http://energyskeptic.com/preservation-of-knowledge/

It would be useful if we could build similar functioning devices on the cheap with lower tech methods.