Vacuum evaporators are usually suitable for metals below 1500°C. Previous research shows Cr/Au are suitable to make electrodes on graphene, but Cr is not suitable to deposit using a vacuum evaporator as the melting point is too high.
Instead, you can use e-beam evaporator or RF magnetron sputtering technique to deposit Cr/Au.
In our lab, we only have vacuum evaporator. We want to make use of that instrument. That is why I want to choose a suitable metal for that deposition.
Dear Nur,
You can use other metals with lower melting temperature such Ag, Co and palladium.
please, you can find more details in this paper:
Low contact resistance metals for graphene based devices ☆
Eiichiro Watanabea, , , Arolyn Conwillb, Daiju Tsuyaa, Yasuo Koidea
a Nanotechnology Innovation Station, National Institute for Materials Science (NIMS), 1-2-1Sengen, Tsukuba, Ibaraki305-0047, Japan
b Physics, Pomona College, 333 North College Way Claremont 91711-6312, CA, United States
http://dx.doi.org/10.1016/j.diamond.2012.01.019, How to Cite or Link Using DOI
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Wish you success.
I think vacuum evaporators means thermal evaporators. If I am right, then you can use Cr coated tungsten rod for Cr evaporation. you can easily evaporate Cr with 20 A current.
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