LIG (Laser Induced Graphene)- Settings

graphene

#1

Not quite ready for prime time yet, but… I made graphene… With the Glowforge :glowforge: !!!

I’ve gotten resistances as low as 10 ohms with some of the settings so far. My only problem is the material is very fragile, and probing it breaks it or flakes it off most of the time. I think using thicker polyimide might produce better results.

Material: Polyimide (Kapton) Tape, 2mil thick
Promising Settings: 1%power / 45Speed / 675LPI / 0.030" Defocused (add 0.030" to the thickness)
Resistance (0.5mm Square): 15 Ohms

I have some more experiments planned with what I currently have. I’m also considering buying thicker material and seeing if that will work better.

EDIT: NEW SETTINGS
New setting that seem to work well. Still using standard Kapton Tape
Power: 11%-25%
Speed: 640
Focus: Normal


#2

um wow!


#3

Okay, help out someone who is interested but somewhat ignorant on this. How do you know you made graphene? Just the impedance, or is there some other test?


#4

Right now, just the impedance. If I can get some funding at work, I might have some other tests I can run. I’m following the process from this paper:

They used a universal CO2 laser, 4.8W. But they didn’t say what there other setting were. Most of the paper was about doping the graphene to make a supercapacitor and its electrical properties afterward.


#5

Oh wow, micro supercapacitors! Get this figured out and we’ll all be making them for our electronics.


#6

Thinking @volivaa should be tagged here. I believe he has even possibly mentioned it on the forums.

Out of my realm of knowledge but appears to be very cool!!!


#7

Yes, I am very excited by this technology. I posted this earlier. I hope to do some experiments as well when I get caught up with contractual obligations.


#8

I need to read the paper you referenced Joe, but I have a spray on transparent, fluorinated tin oxide electrode technology that might be useful.


#9

Ever since this over the top video came out, I’ve been fascinated by graphene. Keep it up and keep us posted.


#10

And I just bought my GF to etch and cut dead plants…


#11

Oh, better article. It focus’s on making the LIG instead of turning it into a capacitor. Looks like I’m hitting the right resistance values.

Edit: From the article and the video’s I’ve seen, I think the sheet I’m using is too thin. They use a 5mil thick sheet, I am using a 1mil thick tape with 1mil of adhesive on it. I’ll need to get some thicker stuff.


#12

I’ve never seen that video. That’s awesome, they made it was a DVD drive! Much better than the scotch tape approach.


#13

Read up on the use of melamine and dicyandiamide for introducing nitrogen heterocyclic rings into a graphene structure.


#14

Find ways to introduce thiophene, selenophene, siloles, and phospholes into the mix for a greater range of properties. Avoid the toxic arsoles. I just realized that last sentence was good life advice as well. Lol


#15

:rofl:


#16

Wow!

Please move the thread to Beyond The Manual - thanks.


#17

Wow. Not by any means useful yet, but wow.


#18

Assumptions:

  • Glowforge cannot cut metal.
  • Graphene is electrically conductive.
  • When the LIG is formed, it has topography.

Experiment:
Use LIG to connect wires.

I sandwiched some wires between some Kapton tape. I exposed the wire through the Kapton. Then I made some Graphene traces.

I GIVE YOU LIGHT!

Hopefully with this, some Kapton sheets, and some components, people can make prototype boards without the boards!


#19

All my likes. Well any I have left after the dovetail and countersink.


#20

What resistance do you get? You could simply be making graphite by burning plastic with carbon in it. How do you know it is graphene?

E.g. epoxy PCB material becomes conductive when it gets too hot and can create self sustaining fires while the power is applied despite being UL rated V0, i.e. self extinguishing.