Elastic modulus of multi-walled carbon nanotubes produced by catalytic chemical vapour deposition

Reinforcement of CVD grown multi-walled carbon nanotubes by high temperature annealing

“…19,20 The formation of defect free graphene layers makes thermal annealing promising for improving of the mechanical properties of large quantities of MWNTs. However, the previous studies 9,21 comparing the evolution of the mechanical properties of AD-and CVD-MWNTs after annealing clearly showed the absence of a noticeable improvement of tensile strength for annealed CVD-MWNTs. This is explained by the low quality of the as grown CVD-MWNTs, and the enhancement of their structure remains limited after annealing as revealed by TEM micrographs.…”

“…This is explained by the low quality of the as grown CVD-MWNTs, and the enhancement of their structure remains limited after annealing as revealed by TEM micrographs. 21 Over the last decade the CVD process has been considerably optimized and it now yields better carbon materials, however the quality of MWNTs still strongly depends on the specific features of the production technique like the catalyst type and reaction conditions. 22,23 A large scale healing of the structural defects and the consequent increase of the Young's modulus is of paramount importance for the application of MWNTs as reinforcement fibers in composites.…”

Nanomechanics of carbon nanotubes

“…catalytically grown MWNTs, known to include a high concentration of defects, can have a Young's modulus as low as 12 GPa (Salvetat et al 1999a;Lukić et al 2005a), demonstrating the use of this measurement method in choosing the optimal synthesis conditions for producing CNTs with favourable mechanical properties (Lukić et al 2005b). …”

Influence of carbon nanotube–polymeric compatibilizer masterbatches on morphological, thermal, mechanical, and tribological properties of polyethylene

“…In the calculations, Poisson's ratio of 0.3 [32][33], density of 2.0 g/cm 3 [30,34,35], Young's modulus of 50 GPa [36][37][38], and estimated aspect ratio of 100 were used for MWCNTs, and Poisson's ratio of 0.35 [39,40] and Young's moduli measured for HDPEPEgMA reference samples (0.66-0.70 GPa) were used for the matrix.…”

“…For CVD-grown MWCNTs, Young's moduli are lower than 100 GPa [36,37] and values are strongly dependent on tube diameter [38]. For our calculations, therefore, we used a Young's modulus of 50 GPa for MWCNTs.…”