Table 2 Cross-sectional chemical composition determined using SEM–EDS

TB

Surface

87.4 ± 0.2

9.4 ± 0.1

1.3 ± 0.2

1.9 ± 0.3

Cross-section

Gold layer

80.2 ± 0.2

9.7 ± 0.1

1.9 ± 0.1

8.2 ± 0.2

Substrate ^b

–

–

–

100.0 ± 0.0

SD

Surface

86.6 ± 0.3

11.1 ± 0.2

1.4 ± 0.1

0.9 ± 0.1

PS

Surface

84.1 ± 0.3

8.8 ± 0.1

2.6 ± 0.1

4.5 ± 0.1

Cross-section

Gold layer

78.3 ± 0.2

10.5 ± 0.1

1.5 ± 0.1

9.7 ± 0.2

Substrate ^b

–

–

–

100.0 ± 0.0

TS

Surface

78.2 ± 0.3

8.6 ± 0.2

2.6 ± 0.1

10.6 ± 0.1

Cross-section

Gold layer

77.1 ± 0.2

10.4 ± 0.3

1.8 ± 0.2

10.7 ± 0.1

Substrate ^b

–

–

–

100.0 ± 0.2

LS

Surface

82.7 ± 0.3

8.9 ± 0.2

1.7 ± 0.1

6.8 ± 0.2

Cross-section

Gold layer

70.7 ± 0.2

7.6 ± 0.1

–

21.8 ± 0.1

Substrate ^b

–

–

–

100.0

WS

Surface

85.8 ± 0.1

7.2 ± 0.3

2.2 ± 0.1

4.8 ± 0.2

Cross-section

Gold layer

66.4 ± 0.1

5.3 ± 0.1

2.9 ± 0.2

25.4 ± 0.1

Substrate ^b

–

–

–

100.0

CW

Surface

87.3 ± 0.3

7.9 ± 0.1

3.3 ± 0.1

1.5 ± 0.1

Cross-section

Gold layer

72.7 ± 0.1

12.2 ± 0.2

2.8 ± 0.1

12.3 ± 0.2

Substrate ^b

–

–

–

100.0