Lyotropic Liquid‐Crystalline Solutions of High‐Concentration Dispersions of Single‐Walled Carbon Nanotubes with Conjugated Polymers

Lee, Hang Woo; You, Wei; Barman, Soumendra N.; Hellstrom, Sondra; LeMieux, Melburne C.; Oh, Joon Hak; Liu, Shuhong; Fujiwara, Takenori; Wang, Wechung Maria; Chen, Bin; Jin, Yong; Kim, Jong Min; Bao, Zhenan

doi:10.1002/smll.200800640

Cited by 54 publications

(38 citation statements)

References 38 publications

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“…rr-P3ATs are also known to self-organize into highly ordered structures in both thin film and on SWNTs 36 . Polythiophenes have previously been used to increase the dispersion concentration of SWNTs 11,38,39 , but their application towards selective dispersion of SWNTs has not been reported.…”

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confidence: 99%

Selective dispersion of high purity semiconducting single-walled carbon nanotubes with regioregular poly(3-alkylthiophene)s

et al. 2011

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Conjugated polymers, such as polyfluorene and poly(phenylene vinylene), have been used to selectively disperse semiconducting single-walled carbon nanotubes (sc-sWnTs), but these polymers have limited applications in transistors and solar cells. Regioregular poly(3-alkylthiophene)s (rr-P3ATs) are the most widely used materials for organic electronics and have been observed to wrap around sWnTs. However, no sorting of sc-sWnTs has been achieved before. Here we report the application of rr-P3ATs to sort sc-sWnTs. Through rational selection of polymers, solvent and temperature, we achieved highly selective dispersion of sc-sWnTs. our approach enables direct film preparation after a simple centrifugation step. using the sorted sc-sWnTs, we fabricate high-performance sWnT network transistors with observed charge-carrier mobility as high as 12 cm 2 V − 1 s − 1 and on/off ratio of > 10 6 . our method offers a facile and a scalable route for separating sc-sWnTs and fabrication of electronic devices.

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Selective dispersion of high purity semiconducting single-walled carbon nanotubes with regioregular poly(3-alkylthiophene)s

et al. 2011

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“…Among suitable dispersants, conjugated polymers are promising candidates owing to their ability to undergo pi-pi stacking with SWNTs. Organic solvent based nematic lyotropic LC phase of noncovalently functionalized CNTs has been reported by Bao et al [85]. They reported a high-concentration dispersion of SWNTs in organic solvents by conjugated polymers and for the first time its transition into the nematic LC phase.…”

Section: Liquid Crystalline Carbon Nanotubesmentioning

confidence: 92%

Liquid Crystalline Anisotropic Nanoparticles: From Metallic and Semiconducting Nanoparticles to Carbon Nanomaterials

Bisoyi

2015

Anisotropic Nanomaterials

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Anisotropic nanomaterials made of metals, semiconductors, or carbon are of special interest for their mechanical, electrical, magnetic, optical, chemical and other spectacular properties in the bottom-up fabrication of advanced functional materials and devices in the field of nanoscience and nanotechnology. To widen their applicability, it is necessary to process these anisotropic building blocks into different well-defined assembly structures with preferred orientations. This chapter deals with the liquid crystalline properties of one-and two-dimensional (1D and 2D) anisotropic nanoparticles such as nanorods, nanotubes, nanodiscs and graphene derivatives. The different strategies developed for the realization of liquid crystal phases from metallic, semiconducting and carbon based anisotropic nanoparticles have been discussed. High performance materials and devices fabricated by processing via liquid crystalline route of these materials have also been highlighted.

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“…Copy right 2011 American Chemical Society materials cast from dispersion and usually results in a more enhanced alignment than from non-nematic lyotropic liquid crystalline dispersions. Recently, organic solvent based nematic lyotropic liquid crystalline phase of noncovalently functionalized CNTs has been reported by Bao et al [81]. They reported a high concentration dispersion of SWNTs in organic solvents by conjugated polymers and for the first time its transition into the nematic lyotropic liquid crystalline phase.…”

Section: Polymer Functionalized Cntsmentioning

confidence: 96%

Liquid Crystalline 1D and 2D Carbon Materials

Bisoyi

Kumar

2014

Nanoscience With Liquid Crystals

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Carbon nanotubes (CNTs) and graphene derivatives have created great expectations in terms of practical applications and advancement of science. Processing through liquid crystalline ordering of CNTs and graphenes is a promising opportunity to develop novel materials and applications with spontaneously aligned one dimensional (1D) (nanotubes) and two dimensional (2D) (graphene) carbon allotropes. This chapter presents the different methodologies that have been developed to achieve nematic liquid crystals of CNTs and graphene derivatives and their subsequent use for the fabrication of field effect transistors (FETs), and high performance carbon fibers etc. by processing via liquid crystalline route. Since carbon-based nanomaterials are being investigated in the right context of contemporary significance, it is optimistically anticipated that the combination of outstanding and unprecedented properties of carbon nanoforms with processability and alignment properties of liquid crystals can lead to some interesting materials and devices with promising properties and performances. IntroductionLiquid crystalline phase is a thermodynamically stable state of matter after solid, liquid and gas and is regarded as the fourth state of matter. Liquid crystalline phase possesses less ordering than crystalline state but more ordering than amorphous liquids. Interestingly, liquid crystals (LCs) share the anisotropic (direction dependent) property of crystalline solids and the fluidity of liquids. Owing to its

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Lyotropic Liquid‐Crystalline Solutions of High‐Concentration Dispersions of Single‐Walled Carbon Nanotubes with Conjugated Polymers

Cited by 54 publications

References 38 publications

Selective dispersion of high purity semiconducting single-walled carbon nanotubes with regioregular poly(3-alkylthiophene)s

Selective dispersion of high purity semiconducting single-walled carbon nanotubes with regioregular poly(3-alkylthiophene)s

Liquid Crystalline Anisotropic Nanoparticles: From Metallic and Semiconducting Nanoparticles to Carbon Nanomaterials

Liquid Crystalline 1D and 2D Carbon Materials

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