One Step Fabrication of Aligned Carbon Nanotube Sheet via FC‐CVD Technique

Abstract

The rising need for lightweight and strong mechanical structures has contributed significantly towards the development of CNT macrostructures; however, the interplay of parameters and their discontinuous synthesis have obstructed their delivery to commercial level. Herein, floating catalyst chemical vapor deposition technique (FC-CVD) has been employed for the fabrication of 90 cm long CNT sheet via continuous production of CNT aerogel. High degree of graphitization, thermal stability and purity have been indicated by Raman spectroscopy ( I G / I D = 10.03 ), thermogravimetric analysis, and SEM studies. Continuous winding of CNT aerogel has increased the alignment into the sample which resulted into high electrical conductivity value of 21400 S/m. Furthermore, the alignment has been quantified by calculating optical anisotropic ratio I G / I G ⊥ via polarized Raman technique and conductivity anisotropic ratio κ / κ ⊥ which were calculated to be 4.63 and 3.4, respectively, and show reasonable agreement. These findings indicate that a well correlation of synthesis parameters results in highly aligned CNT sheet structure in a single step.

Manufacturing Scalable Carbon Nanotube–Silicone/Kevlar Fabrics

“…Resistivity values are given in Table 1. The conductivity anisotropy ratio observed was a result of a higher number of junctions (i.e., fewer aligning CNTs) along the direction orthogonal to that of the sock collection [45]. Similarly, the electrical resistance of the sheet would be much greater through the thickness of the sheet than in the plane.…”

“…The decrease in strength but increase in strain was a result of anisotropy generated during the synthesis process. A greater number of CNT junctions were present along the width of the sample, and they tended to separate when subjected to stress, causing higher strain but lower strength (Figure 7) [45]. gauge length of 20 mm and a width of 2 mm were prepared and supported with the assistance of a rectangular paper specimen holder.…”

Investigation of carbon nanotube sheet for lunar dust shielding

“…23 The difference in resistivity along length and width arose due to the anisotropy in CNT sheet induced during sock collection. 24 The electrical resistance of the sheet is much greater through the thickness of the sheet than in-plane. The greater resistance through the thickness is due to the greater number of nanotube-to-nanotube lateral junctions.…”