Originally Posted by technogiant
Why don't they make graphene TIM with "bucky balls"...the graphene is formed into spheres rather than sheets/plates, they would surely conduct equally in whatever orientation?
I'd imagine it would be hard to synthesize significant amounts of it. Graphene /can/ be very cheap to get significant amounts depending on the purity. If I recall correctly it's about $150 for 50g.
Originally Posted by RnRollie
For good conductivity, you have to orientate the graphene layers in the ''right'' direction on MOLUCULAIR level, something which is a bit hard to do in a garden shed.
And you have to work with oriented layers, unless you have the technological means to apply only ONE layer (which is not visible to the naked eye) in foresaid garden shed
So you have to layer-up (all layers correctly orientated) till you have something approaching gold leaf/foil which can be grabbed & applied with the right tools... at which point goldleaf might be cheaper.
The technology needed to create functional graphene tim is currently out of reach - unless you've got a REALLY amazing garden shed.
a LOT of graphene powder/paste sellers are not selling graphene, but graphite... which is close, but not the same
The only way to verify if its graphene or graphite is a $ 750 000 Electron Microscope, not something you find every day in a garden shed.
So, if you want to apply cheap (only $ 6,99) ''graphene'' on you HS, go ahead...but applying a $ 0,20 pencil works also, with the same effect.
Orienting the molecules is not absolutely necessary to achieve superior performance to current TIMs. The most thermally conductive TIM out there right now is CL Liquid Pro, which is about 80w/m*k. Most high end thermal nterface materials are around 17w/m*k, and copper is around 380w/m*k. Graphene is around 4000w/m*k. It doesn't take a genius to see one of those numbers is a LOT bigger than the rest. XD
The ideology behind graphene thermal paste is that even with all of them in a random orientation, enough would be facing the right direction to have superior thermal conductivity than other materials. There was someone I saw who did just that, and it worked pretty well, much better than the high end tims he was using. (Note: He spent top dollar, around $60 for it just to test it out)
So the proof of concept is there...