26 MAY 2010
The research group of Korea with Professor Iijima who discovered the carbon nanotube (Meijo University) developed how to make new graphene.
It is a kind of CVD chemical vapor deposition method,
Using a copper foil having catalytic function on the substrate
Bake at 1000 degrees in a quartz oven containing hydrogen and methane gas etc to make a monolayer of carbon on the copper foil.
On how to make graphene homepages,
it has been reported that iron and nickel have high catalytic abilities.
The copper foil is easy to bend, and Copper and carbon are easy to peel off.
It would be advantageous when transferring from a copper foil to a polyethylene film or the like film.
Copper foil has electrolysis and rolling, but both surfaces are not so smooth.
But graphene on the surface must be smooth and large area.
I say 1000 degrees is too high as the temperature of the copper foil, so it is a little impossible to manufacturer.
Since copper does not have high melting point, it seems that the grain grows excessively when it is baked at 1000 degrees and it becomes so rough surface.
Iron or nickel was ahead of it, because it is strong against high temperature.
Low temperature synthesis will be the key from 1000 degrees to 600 degree.
Do you devise a gas or pressure to devise low temperature synthesis
I wonder whether to change from CVD to alternative method.
If a high voltage is applied between the water containing alcohol and the substrate, graphene will be formed on the substrate, so it may be a solution.
I think shipping should be good for transferring from the board.
Copper, iron and nickel.
Since any of them can be made smooth by chemical plating or electroplating.
The place where electrochemistry is active also increased, did not it?
Do not lose to the Korean team, Japan!!
理工学、経済、実験、電池に関するコラムニスト。