I had intentions of making a DC electromagnet using laser-induced graphene (LIG), where the graphene will be used as a flexible electromagnetic coil. Something like those 24V electromagnets you can find online. But I had a concerns on the quality of such a magnet.
Well, I don't know much about electrical engineering in general, so I was trying to find the numbers and compare to other known materials, such as copper.
But unfortunately I couldn't find any precise answer, most of the papers say different values for different conditions.
For example:
- In this paper they say they achieved 15.9Ω/sq, but they've made a interdigital electrode capacitor (whatever this means).
- In this other paper they say 102.4 ± 7.3 Ω/square, but their objective is completely different, they are trying to make electrochemical biosensors.
- In this other paper, they say they used a treatment to help the LIG to increase its conductivity. But the article is behind a paywall and sci-hub just shows an "404 not found" message, so I can't tell much.
- This one is about a infrared CO2 laser process (I didn't even knew CO2 lasers could be infrared) and it achieved the conductivity of ~25 S cm−1.
- I just found this paper talking about a low resistivity LIG: 0.30 Ω/sq
Apparently, the laser's power used is significant to the result, since they used a 30W laser in a "special" substrate of Polyetherimide (PEI) filament; while other papers (like the ones I listed) just used lasers around 4,5 W power on polyimide substrates.
Comparing to copper, the most commonly used metal on cables and electromagnets, which have 16.78 nΩ•m of resistivity and 58 MS/m (both values are in 20 ºC, I don't know if commercially available copper have the same values).
The question:
I don't know if this means LIG is just plain bad or if the papers simply aren't good as a reference because they simply are neither trying to make a conductor, nor an electromagnet.
Taking better sources (or simply taking these sources) is LIG made from Kapton tape a good conductor?
