Enrichment of Large-Diameter Single-Walled Carbon Nanotubes by Oxidative Acid Treatment

2002 ◽  
Vol 106 (29) ◽  
pp. 7160-7162 ◽  
Author(s):  
Yanlian Yang ◽  
Hongling Zou ◽  
Bin Wu ◽  
Qingwen Li ◽  
Jin Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Acid Treatment ◽  
Large Diameter ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Effects of the Molecular Weight of PCz on Selective Extraction of Large-Diameter Semiconducting Single-Walled Carbon Nanotubes

2021 ◽  
Vol 69 ◽  
pp. 11-21
Author(s):  
Ping Zhang ◽  
Wen Hui Yi ◽  
Bai Lei ◽  
Jin Feng Zhou ◽  
Yi Long Tian ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Weight ◽  
Arc Discharge ◽  
Large Diameter ◽  
Single Walled Carbon Nanotubes ◽  
Selective Extraction ◽  
High Yield ◽  
Extraction Technology ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Due to the difficulty in the selective synthesis of semiconductor (s-) and metal (m-) single-walled carbon nanotubes (SWCNTs), we still need to explore the selective extraction technology of s-SWCNTs. Using Poly[9-(1-octylonoyl)-9H-carbazole-2,7-diyl] (PCz) extraction of s-SWCNTs has attracted extensive attention in recent years, because it can selective extraction of large-diameter s-SWCNTs with high purity. However, influence of the molecular weight of this polymer on the s-SWCNTs selective extraction properties remains unclear. In this study, we used PCz with different average molecular weights to study the ability of selective extraction s-SWCNTs from pristine arc discharge carbon nanotubes. Spectra studies indicate that compared to the PCz with lower molecular weight, the PCz with higher molecular weight has better selective extraction ability, and can help to obtain s-SWCNTs with higher purity (>99%) and high yield. FETs devices have been prepared by s-SWCNTs obtained via PCz with higher molecular weight exhibit higher on/off ratio, lower off current and lower subthreshold swing. This work offers a reference of the design and synthesis of PCz polymer that performs sufficient selective ability in extracting s-SWCNTs with promising applications.

scholarly journals Manufacture of Networks from Large Diameter Single-Walled Carbon Nanotubes of Particular Electrical Character

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 614 ◽  
Author(s):  
Edyta Turek ◽  
Bogumila Kumanek ◽  
Slawomir Boncel ◽  
Dawid Janas
Keyword(s):  
Carbon Nanotubes ◽  
Large Diameter ◽  
Single Walled Carbon Nanotubes ◽  
Phase Extraction ◽  
Free Standing ◽  
Two Phase ◽  
Trade Off ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
Aqueous Two Phase Extraction

We have demonstrated that the aqueous two-phase extraction (ATPE) can differentiate between large diameter single-walled carbon nanotubes (CNTs) by electrical character. Introduction of “hydration modulators” to the ATPE machinery has enabled us to isolate metallic and semiconducting CNTs with ease. We have also shown that often there is a trade-off between the purity of the obtained fractions and the ability to separate both metallic and semiconducting CNTs at the same time. To isolate the separated CNTs from the matrices, we have proposed a method based on precipitation and hydrolysis, which can eliminate the need to use lengthy dialysis routines. In the final step, we prepared thin free-standing films from the sorted material and probed how electrical charge is transported through such macroscopic ensembles.

C60(OH)n-ASSISTED DISPERSION OF SINGLE-WALLED CARBON NANOTUBES

NANO ◽  
2008 ◽  
Vol 03 (06) ◽  
pp. 455-459 ◽  
Author(s):  
YUTAKA MAEDA ◽  
TAKAAKI KATO ◽  
JUNKI HIGO ◽  
TADASHI HASEGAWA ◽  
TAKAHIRO KITANO ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Large Diameter ◽  
Single Walled Carbon Nanotubes ◽  
Photoluminescence Spectra ◽  
Nonaqueous Solutions ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

We demonstrate that C 60( OH )n-assists the dispersion of SWNTs in aqueous and nonaqueous solutions, which effectively exfoliates large-diameter SWNTs. The SWNT dispersions are characterized by absorption and photoluminescence spectra.

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