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| Sample numbers | Materials | Contact electrical resistance (mΩ) |
|---|---|---|
| 1 | Cu foil | 0.28 |
| 2 | Cu/graphene composite coating (CuSO4 20 g L−1) | 0.27 |
| 3 | Cu/graphene composite coating (CuSO4 40 g L−1) | 0.25 |
| 4 | Cu/graphene composite coating (CuSO4 60 g L−1) | 0.22 |
