Fig. 3
From: Hierarchical self-entangled carbon nanotube tube networks
Overview of the 3D CNTT structures (0.12 g cm−3) obtained from CNTT/t-ZnO composites and their electrical and mechanical characteristics. a Schematic representation of the fabrication process, showing the CNTT/t-ZnO structure before and after etching with HCl (1 M in water); b–e SEM images of the resultant 3D CNTT assembly at different magnifications showing a hollow interconnected tubular structure consisting of self-entangled carbon nanotubes (scale bar: 5 µm); f Compressive stress–strain curves for 3D CNTT assemblies showing a high structural strength of up to 0.24 MPa (dots represent experimental measurements, continuous line FEM simulation); g Conductivity (~130 S m−1) during compression test; h FEM image showing the tensile behavior of the CNTT arms under a global compressive load, indicating that the CNTs are employed in their tensile properties, even though the structure is compressed
