Advances and challenges of CNM nanocomposite-based sensors from the period 2011–2021 are discussed.

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Floating catalyst chemical vapor deposition (FC-CVD) is a promising and viable technique for scalability and continuous synthesis of carbon nanotubes (CNTs) macroassemblies through single gas phase pyrolysis process. However, their...

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The electrical conductivity of carbon nanotube (CNT) macro assemblies can be influenced by their crystallinity. Herein, we present the synthesis of high-quality SWCNT sheets for which an appropriate optimization parametric research of synthesis temperature, precursor flow rate, and H 2 flow rate was carried out in this approach. It was found that highly crystalline SWCNT sheet (I G /I D = 180.3) was synthesized by floating catalyst chemical vapor deposition technique at 12 mL/h precursor flow rate and 1000 sccm H 2 flow rate. Three distinct Raman laser wavelengths (514, 532, and 785 nm) were used to study the assynthesized sheet, and the maximum calculated I G /I D ratio was found to be 180.3 (@ λ = 514 nm). Due to high concentration of H 2 gas, the number of localized liquid zones or CNT nucleation sites increased which has an impact on both the quality as well as the diameter of CNTs. The I−V characteristics of CNT sheet were studied via four-probe technique, yielding a measured value of electrical conductivity of 9.21 × 10 6 S/m. Further, the R-T measurement showed the positive temperature coefficient up to the 108 K which indicates the metallicity of as produced CNT sheets. These highly conducting SWCNT sheets are the best solution for a wide range of applications in many fields, including conducting shields in coaxial cables, flexible and nano scale electrical and electronic devices, displays, biosensors, field-effect transistors and gas sensing materials.

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