Table 1 Comparison of contact angle CA measurements, roughness s_a measurements, and shear strengths τ_C of graphene on TEOS SiO₂, Si₃N₄, and thermal SiO₂ and of hBN on thermal SiO₂

O₂ plasma

No

Yes

No

No

Yes

CA_water (°)

7.3 ± 1.5

3.0 ± 1.3

19.3 ± 0.3

42.7 ± 0.3

2.7 ± 1.6

CA_{diiodomethane} (°)

40.6 ± 0.4

35.3 ± 0.6

40.7 ± 1.8

45.2 ± 0.5

34.6 ± 0.3

Surface Energy (mN m⁻¹)

76.0 ± 0.6

77.4 ± 1.9

73.0 ± 0.6

60.6 ± 0.2

77.5 ± 1.8

Roughness s_a of the substrate (nm)

0.76

0.69

0.30

0.22

0.21

Roughness s_a of graphene on the substrate (nm)

0.64

0.42

0.22

Shear strength τ_C of graphene (MPa)

1.55 ± 0.31

2.21 ± 0.33

2.88 ± 0.31

2.68 ± 0.11

2.77 ± 0.32

4.43 ± 0.95