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Table 2

The average length of the graphene layers of HAC materials before and after the UV irradiation.

S# UV dose La (nm)

(eV cm-2) Average Largest

S1 original .... 0.42 2.7
S2 original .... 0.45 3.1
S3 original .... 0.43 1.8
S26 original .... 0.72 2.5

S3 (grid irradiated for 23h) 3.0 × 1022 1.72 9.8 a few fibers between AC structures up to 15 nm (2–3 nm thickness)
S3 (grid irradiated for 72h) 1.0 × 1023 2.9 15.1 more long-ordered fibers between AC structures (12 nm thickness)
S3 irradiated for 40h 5.2 × 1022 1.82 6.6 long-ordered fibers between AC structures (5.8 nm thick)
S4 irradiated for 72h 1.0 × 1023 2.2 8.0 individual fiber between AC structures
S7 irradiated for 72h 1.0 × 1023 2.3 5.1 individual fiber between AC structures
S8 irradiated for 48h 6.3 × 1023 1.7 8.3 a few fibers between AC structures up to 10 nm (1.5 nm thick)
S26 irradiated for 72h 1.0 × 1023 2.5 8.3 long fibers between AC structures

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