Dielectric and Electrical Properties of WS₂ Nanotubes/Epoxy Composites and Their Use for Stress Monitoring of Structures

Table 1

Samples dimensions and measured average DC conductivities. Sample 7 contained 25 Vol.% of INT-WS₂ which were mixed thoroughly with the epoxy resin without compression (cast only). Samples 8–11 containing 25 Vol.% of nanotubes were only lightly mixed and were compressed by applying pressures of 0.8 (sample 8), 13.9 (sample 9), 27.8 (sample 10), and 55.6 (sample 11) MPa.

Sample type	Length mm]	Width mm]	Thickness mm]	σ [/m]
Neat epoxy	20.00 ± 0.05	4.10 ± 0.03	1.46 ± 0.05
Pellet-neat INT-WS2	—	—	0.62 ± 0.03
Sample 7	22.10 ± 0.03	4.30 ± 0.01	1.04 ± 0.06
Sample 8	20.40 ± 0.05	4.30 ± 0.07	1.18 ± 0.08
Sample 9	20.60 ± 0.02	4.34 ± 0.07	1.01 ± 0.06
Sample 10	20.50 ± 0.02	4.40 ± 0.06	0.98 ± 0.05
Sample 11	20.50 ± 0.05	4.37 ± 0.05	0.88 ± 0.08