Table 1. The electrical conductivity and hardness of RGO-Cu composites.

Sample	Hardness (HV)	Conductivity (%IACS)
2.5 vol.% RGO-Cu (This work)	161.7	65.5
5 vol.% RGO-Cu (This work)	188.8	62.0
2.5 vol.% RGO-Cu47	105	53.2
Pure Cu46	63	—