Supramolecular complexes of single walled carbon nanotubes with conjugated polymers

Imin, Patigul; Cheng, Fuyong; Adronov, Alex

doi:10.1039/c0py00286k

Cited by 45 publications

(42 citation statements)

References 61 publications

(94 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The lowest (PC 5 ) and highest (PC 92 ) molecular weight polymers produced relatively dilute SWNT dispersions, consistent with previously reported results. 41 after removal of excess polymer at both the 2:1 and 1:1 polymer:SWNT ratios, while the rest of the polymers (PC 27 , PC 30 , and PC 43 ) all produced clear, olive-green SWNT dispersions (see Figure S2 in Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…37 Previous studies involving polyfluorenes and polythiophenes have demonstrated that molecular weight can have a significant impact on the quality and stability of the SWNT dispersion. [38][39][40][41] In order to compare the effect of changing conjugated polymer Additional Supporting Information may be found in the online version of this article. structure on the selectivity for dispersing specific SWNT chiralities, it is important to consider the effect of polymer length, as one cannot assume that the observed selectivity is independent of this parameter.…”

mentioning

confidence: 99%

See 1 more Smart Citation

The effect of molecular weight on the separation of semiconducting single‐walled carbon nanotubes using poly(2,7‐carbazole)s

Rice

Subrahmanyam

Laengert

et al. 2015

J. Polym. Sci. Part A: Polym. Chem.

Self Cite

View full text Add to dashboard Cite

The use of selective interactions between conjugated polymers and single‐walled carbon nanotubes has emerged as a promising method for the separation of nanotubes by electronic type. Although much attention has been devoted to investigating polyfluorenes and their ability to disperse semiconducting carbon nanotubes under specific conditions, other polymer families, such as poly(2,7‐carbazole)s, have been relatively overlooked. Poly(2,7‐carbazole)s have been shown to also preferentially interact with semiconducting carbon nanotubes, however a detailed investigation of polymer parameters, such as molecular weight, has not been performed. We have prepared seven different molecular weights of a poly(2,7‐carbazole), from short chain oligomers to high molecular weight polymers, and have investigated their effectiveness at dispersing semiconducting single‐walled carbon nanotubes. Although all polymer chain lengths were able to efficiently exfoliate carbon nanotube bundles using a mild dispersion protocol, only polymers above a certain threshold molecular weight (Mn ∼ 27 kDa) were found to exhibit complete selectivity for semiconducting nanotubes, with no observable signals from metallic species. Additionally, we found the quality of separation to be strongly dependent on the ratio of polymer to carbon nanotube. Contrary to previous reports, we have found that an excess of poly(2,7‐carbazole) leads to incomplete removal of metallic carbon nanotubes. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015, 53, 2510–2516

show abstract

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

The effect of molecular weight on the separation of semiconducting single‐walled carbon nanotubes using poly(2,7‐carbazole)s

Rice

Subrahmanyam

Laengert

et al. 2015

J. Polym. Sci. Part A: Polym. Chem.

Self Cite

View full text Add to dashboard Cite

show abstract

“…10 However, CNTs bundle and cluster together in disordered agglomerates due to the integral interaction energy and van der Waals force between neighboring CNTs. Various effective methods have been established by researchers to achieve homogeneous dispersion of CNTs, including physical methods with the assistance of an electric field, 15 magnetic field, 16-18 ultrasound 19,20 and chemical methods to treat the surface of the CNTs by applying covalent bonding, 21 π-π stacking interactions, 22 surfactants, 23,24 enzymes, 25,26 a polymer matrix 27,28 and inorganic materials. Various effective methods have been established by researchers to achieve homogeneous dispersion of CNTs, including physical methods with the assistance of an electric field, 15 magnetic field, 16-18 ultrasound 19,20 and chemical methods to treat the surface of the CNTs by applying covalent bonding, 21 π-π stacking interactions, 22 surfactants, 23,24 enzymes, 25,26 a polymer matrix 27,28 and inorganic materials.…”

Section: Introductionmentioning

confidence: 99%

Chiral surfactants for dispersing carbon nanotubes

Lin

Zhang

2015

Polym. Chem.

View full text Add to dashboard Cite

A novel and effective way to disperse carbon nanotubes (CNTs) by using amphiphilic chiral side-chain liquid crystalline oligomers (ACSLCOs) as chiral surfactants, which possess dual affinity for both CNTs and chiral liquid crystals (CLCs), is reported here for the first time. For the binary system consisting of CNTs and ACSLCOs, the concentration of CNTs dispersed by ACSLCOs was determined by Fourier transform infrared (FTIR) spectroscopy combined with ultraviolet-visible-near infrared spectroscopy. The ability to disperse CNTs increases as the mole fraction of polycyclic conjugated structures on the chiral surfactants increases, and the concentration reaches 0.85 mg mL −1 . The dispersion state of the CNTs in the composites was characterized by a FTIR imaging system, and the CNT-O7 composite demonstrated the best dispersion of CNTs. The evenly dispersed CNTs reduce the glass transition temperature and improve the thermal stability of the ACSLCOs. For the ternary system consisting of CNTs, O7 and a low molecular weight CLC, the dispersion state of the CNTs was characterized using a polarized optical microscope.The results show that the CNTs possess excellent compatibility with the low molecular weight CLCs with the assistance of O7. The dispersed CNTs are proven to have increased the chiral stability of the chiral host by the measurement of the Bragg selective reflection. † Electronic supplementary information (ESI) available. See

show abstract

“…13 A wide variety of conjugated polymer structures have been studied, including derivatives of polyphenylene vinylenes, 14 polyphenylene ethynylenes, 15,16 polyfluorenes, 17,18 and polythiophenes. 19,20 Variations of the polymer backbone, 21 side chains, 22 polymer molecular weight, 23,24 and the solvent used, 25 have all been shown to significantly impact the quality of nanotube dispersions. Previous work has shown the potential of polyfluorenes, such as poly (9,9-dioctylfluorenyl-2,7-diyl) (PFO), to selectively disperse a subset of semiconducting SWNTs.…”

mentioning

confidence: 99%

Selective interactions of a high-molecular-weight polycarbazole with different commercial nanotube samples

Rice

Adronov

2014

J. Polym. Sci. Part A: Polym. Chem.

Self Cite

View full text Add to dashboard Cite

The ability of a poly(2,7‐carbazole) to disperse three samples of commercially available single‐walled carbon nanotubes (raw HiPCO, purified HiPCO, and CoMoCAT nanotubes) has been investigated. UV–vis‐NIR absorption spectroscopy, photoluminescence mapping, Raman spectroscopy, and atomic force microscopy were used to characterize the dispersions obtained. It was found that the polycarbazole preferentially interacted with semiconducting nanotubes and was efficient at dispersing smaller diameter (under 1.1 nm) carbon nanotubes. Larger diameter nanotubes could be dispersed to form stable suspensions in THF; however, it appeared that there were some small bundles present. It was found that annealing the purified HiPCO nanotubes at high temperature under an inert atmosphere greatly enhanced the ability of the polycarbazole to disperse the nanotubes and remove metallic species. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 2738–2747

show abstract

Supramolecular complexes of single walled carbon nanotubes with conjugated polymers

Cited by 45 publications

References 61 publications

The effect of molecular weight on the separation of semiconducting single‐walled carbon nanotubes using poly(2,7‐carbazole)s

The effect of molecular weight on the separation of semiconducting single‐walled carbon nanotubes using poly(2,7‐carbazole)s

Chiral surfactants for dispersing carbon nanotubes

Selective interactions of a high-molecular-weight polycarbazole with different commercial nanotube samples

Contact Info

Product

Resources

About