Non-destructive testing of graphene/epoxy composites using THz waves

Forfatter
Haakestad, Magnus W.
Johnsen, Bernt Brønmo
Dam, Anh Hoang
Mastin, Johann Roland M
Eid, Michel
Rheenen, Arthur Dirk van
Publisert
2018-10-05
Emneord
Absorpsjon
Terahertz
Stråling
Epoksy
Permalenke
http://hdl.handle.net/20.500.12242/2685
DOI
10.1117/12.2325539
Samling
Articles
Description
Haakestad, Magnus W.; Johnsen, Bernt Brønmo; Dam, Anh Hoang; Mastin, Johann Roland M; Eid, Michel; Rheenen, Arthur Dirk van. Non-destructive testing of graphene/epoxy composites using THz waves. Proceedings of SPIE, the International Society for Optical Engineering 2018 ;Volum 10800.
1684284.pdf
Size: 1015k
Sammendrag
In earlier experiments [1] we found there was significant transmission of THz radiation through carbon-fiber enforced composites, despite that fact that the dc conductivity of the carbon fibers is expected to be good and hence should prevent penetration of electro-magnetic radiation. To study the relationship between absorption of THz radiation and electrical conductivity we performed measurements on samples with different concentrations of graphene in an epoxy matrix. We observed an increased absorption of THz radiation with increased graphene concentration. Our conductivity measurements (simple transverse DC measurements using tin foil as electrodes that cover the two sample surfaces) showed the typical increase of several orders of magnitude with graphene concentration. Although both the conductivity and the THz absorption increase with graphene concentration, there is no direct cause-and-effect relation between the two quantities. Careful analysis shows that even the highest dc conductivity values cannot explain even the lowest observed values for the THz absorption coefficient.
View Meta Data