Epoxy Molecular Structure Alteration in Graphene …
477
Table 2
The positron lifetimes for i-th
component (τ
i ), the intensities of the i-th
component (I
i ), average positron lifetime (τ
av ),
free volume radius (R) and
free volume fraction (f
v ) for investigated samples
C,
%
I
1 , %
I
2 , %
I
3 , %
τ 1 , ps
τ 2 , ps
τ 3 , ps
τ av , ps
R,
Å
f
v %
0
53.23 (0.51) a
31.96 (0.49)
14.82 (0.24)
199.6 (2.2)
527.0 (9.5)
1670 (12)
522.1 (3.7)
2.522 (0.026)
1.792 (0.047)
1
52.86 (0.63)
31.82 (0.63)
15.32 (0.25)
199.4 (2.5)
503 (10)
1627 (8,3)
514.6 (3.6)
2.476 (0.018)
1.754 (0.038)
2
49.66 (0.71)
34.52 (0.70)
15.82 (0.29)
190.7 (2.8)
473.5 (8.8)
1581 (10)
508.3 (3.7)
2.426 (0.023)
1.703 (0.045)
5
52.68 (0.72)
32.45 (0.71)
14.88 (0.29)
199.9 (2.8)
489 (10)
1597 (12)
501.6 (3.9)
2.443 (0.027)
1.635 (0.048)
a
Standard deviations are given in round brackets