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(a) FESEM image showing the pristine fractured cross section of an as-grown nanowire array/PAA composite. (b) A magnified view of the composite cross section that shows that the crack through the interface between the PAA and the nanowire rather than through the nanowire, in contrast to the observed behavior of cracks in the nanowire/SU-8 composite [Figs. 2(a) and 2(b) ].
(a) FESEM image showing the pristine fractured cross section of a nanowire array/SU-8 composite. The nanowires are embedded in the SU-8 epoxy matrix confirming complete infiltration of the epoxy. (b) A magnified view of the composite cross-section that shows that the fracture plane propagates through the nanowire—exposing crystallographic cleavage planes in —and not through the interface between the nanowire and the SU-8 epoxy.
SU-8 processing steps and optimized baking time for nanowire array infiltration.
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