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

Figure 4

SEM images of sample 8 (prepared with a load of 0.8 MPa) (a) low and (b) high magnifications; (c) low and (d) high magnifications of sample 9 (13.9 MPa). While the nanotubes appear nude in sample 8, polymer infiltration between the tubes (and consequently electrical insulation) is obvious in sample 9.

(a)

(b)

(c)

(d)