Table 1 Maximum SEY values of different materials.

From: Prospects for microwave plasma synthesized N-graphene in secondary electron emission mitigation applications

Sample/material

SEYmax

HOPG

1.2

Amorphous carbon, CERN9

0.93–1.03

Graphite powder, reference supplier

1.3

Graphene deposited on flat Al (no detailed info)21

0.6–0.8

Graphene (this work)

1.0

NG 1.5% N

0.95

NG 4.4% N

0.96

NG 8.0% N

0.84