Three-dimensional texture analysis of aligned carbon nanotube structures

Gbordzoe, Seyram; Yarmolenko, Sergey; Hsieh, Yu-Yun; Adusei, Paa Kwasi; Alvarez, Noe T.; Fialkova, Svitlana; Shanov, Vesselin

doi:10.1016/j.carbon.2017.06.028

Cited by 19 publications

(20 citation statements)

References 46 publications

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“…" Figures 2a and b show representative SEM micrographs of before and after the post-treatment: the post-treated CNT textiles have increased alignment and density, while bundle edges are less defined. While there are many techniques to quantify microstructure alignment, such as X-ray diffraction [31] and Fourier transform analysis of scanning electron microscopy [32], here we used established techniques with polarized Raman spectroscopy [33] [34] (see supplemental section 1 for further description and results). We found a positive relationship between the anisotropy indicated by the polarized Raman signal and the degree of stretching.…”

Section: Resultsmentioning

confidence: 99%

Extreme stretching of high G:D ratio carbon nanotube fibers using super-acid

Bulmer

Mizen

Gspann

et al. 2019

Carbon

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Few-wall carbon nanotube (CNT) textiles with unparalleled graphitic perfection and a solitary, prominent radial breathing mode (RBM) associated with metallic chirality have been mechanically stretched in chlorosulfonic acid (CSA) to a degree so far unseen in CNT textiles (150 to 250% of original length) with notably little tension required. This dramatically enhanced their microstructural alignment and density and, after most of the residual CSA was removed by a vacuum bake, the de-doped fiber's electrical conductivity was found to be 45% greater than single-crystal graphite-a significant milestone for CNT conductor development towards graphitic intercalation compounds (GICs) and traditional metals. Correlation tables and validated, multivariate statistical models show that conductivity is overwhelmingly linked to stretching degree, although eventually saturates near single-crystal graphite levels, implying the existence of a maximum undoped conductivity. The degree of stretching within CSA is correlated with the original mechanical properties (tenacity, elongation-to-break, and linear density); the Raman G':G ratio and the upper-end oxidation temperature in thermogravimetric analysis also predict the best results. Less graphenically pristine CNT materials stretch to a lower degree in CSA, similar to previous reports. This study highlights the importance of post-synthesis processing to achieve superior performance in carbon nanotube textile materials.

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Section: Resultsmentioning

confidence: 99%

Extreme stretching of high G:D ratio carbon nanotube fibers using super-acid

Bulmer

Mizen

Gspann

et al. 2019

Carbon

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show abstract

“…In contrast, scattering techniques are the most appropriate means to characterize dispersion. 46 The dispersion state of carbon nanotube in a polymer matrix should be evaluated over a broad range of scales and can be accomplished by using the following imaging techniques: transmission electron microscopy, scanning electron microscopy, scanning probe microscopy, polarized Raman spectroscopy, [55][56][57] optical microscopy, and confocal microscopy. In recent years, confocal laser scanning microscopy has been successfully applied to evaluate the dispersion state of carbon nanotubes in polymer matrices.…”

Section: Characterization Techniquesmentioning

confidence: 99%

A review of the interfacial characteristics of polymer nanocomposites containing carbon nanotubes

et al. 2018

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“…Full‐width‐half‐maximum (FWHM) is normally used to evaluate the degree of alignment of the CNTs, normally, a small FWHM indicates the CNTs sample has a higher degree of alignment. Besides, a more recent study used X‐ray CT scan to inspect the 3D texture of CNTs film . Also, a 3D distribution of CNTs network can be inspected by electron tomography with which the orientation of the CNTs can be visualized…”

Section: Methods For Cnts Alignment Characterizationmentioning

confidence: 99%

Directed and On‐Demand Alignment of Carbon Nanotube: A Review toward 3D Printing of Electronics

Goh

Agarwala

Yeong

2019

Adv Materials Inter

126

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Carbon nanotubes (CNTs) are 1D nanostructured materials with unique mechanical, optical, and electrical properties which can be potentially exploited for fabricating wide variety of devices. In addition, the biocompatibility of CNTs makes it attractive for wearable and implantable technology applications. Well‐aligned CNT structures show enhanced properties such as superior electron mobility, strain sensitivity, better mechanical property, and enhanced performance and reproducibility that are absent in their disordered counterparts, thus allowing more promising applications in various fields. With aligned CNTs, devices can be optimized to exhibit better performance with lesser materials and more miniature designs. This review summarizes the landscape of CNTs alignment, either during the growth or post‐growth processing. This paper delineates various CNTs alignment mechanism, process parameters, and challenges of each technique. A comparative discussion on the advantages, disadvantages, and degree of alignment of each technique is presented. A detailed discussion on the various applications that utilize properties of aligned CNTs devices is presented. The advent of 3D printing techniques for printing CNTs for novel and futuristic applications is also discussed.

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Three-dimensional texture analysis of aligned carbon nanotube structures

Cited by 19 publications

References 46 publications

Extreme stretching of high G:D ratio carbon nanotube fibers using super-acid

Extreme stretching of high G:D ratio carbon nanotube fibers using super-acid

A review of the interfacial characteristics of polymer nanocomposites containing carbon nanotubes

Directed and On‐Demand Alignment of Carbon Nanotube: A Review toward 3D Printing of Electronics

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