Water-dispersible carbon nanotube prepared by non-destructive functionalization technique of admicellar polymerization

Seneewong-Na-Ayutthaya, Montira; Pongprayoon, Thirawudh

doi:10.1016/j.diamond.2015.10.030

Cited by 12 publications

(7 citation statements)

References 31 publications

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“…The loading mass of PAA in the PAA-SWNT film was revealed by thermogravimetric analysis (TGA) (Figure f). The weight percentage of PAA in the PAA-SWNT was around 10% …”

Section: Resultsmentioning

confidence: 99%

“…The weight percentage of PAA in the PAA-SWNT was around 10%. 41 The electrochemical performances of Li−S battery with our designed carbon interlayer were evaluated by coin-type half cell (2032R type) and presented in Figure 3. Figure 3a shows the initial discharge−charge curves of the pure sulfur cathode, the sulfur cathode with a SWNT interlayer, and the sulfur cathode with a PAA-SWNT interlayer.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Synergistic Ultrathin Functional Polymer-Coated Carbon Nanotube Interlayer for High Performance Lithium–Sulfur Batteries

Kim

Seo

Choi

et al. 2016

ACS Appl. Mater. Interfaces

104

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Lithium-sulfur (Li-S) batteries have been intensively investigated as a next-generation rechargeable battery due to their high energy density of 2600 W·h kg(-1) and low cost. However, the systemic issues of Li-S batteries, such as the polysulfide shuttling effect and low Coulombic efficiency, hinder the practical use in commercial rechargeable batteries. The introduction of a conductive interlayer between the sulfur cathode and separator is a promising approach that has shown the dramatic improvements in Li-S batteries. The previous interlayer work mainly focused on the physical confinement of polysulfides within the cathode part, without considering the further entrapment of the dissolved polysulfides. Here, we designed an ultrathin poly(acrylic acid) coated single-walled carbon nanotube (PAA-SWNT) film as a synergic functional interlayer to address the issues mentioned above. The designed interlayer not only lowers the charge transfer resistance by the support of the upper current collector but also localizes the dissolved polysulfides within the cathode part by the aid of a physical blocking and chemical bonding. With the synergic combination of PAA and SWNT, the sulfur cathode with a PAA-SWNT interlayer maintained higher capacity retention over 200 cycles and achieved better rate retention than the sulfur cathode with a SWNT interlayer. The proposed approach of combining a functional polymer and conductive support material can provide an optimiztic strategy to overcome the fundamental challenges underlying in Li-S batteries.

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“…The loading mass of PAA in the PAA-SWNT film was revealed by thermogravimetric analysis (TGA) (Figure f). The weight percentage of PAA in the PAA-SWNT was around 10% …”

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Synergistic Ultrathin Functional Polymer-Coated Carbon Nanotube Interlayer for High Performance Lithium–Sulfur Batteries

Kim

Seo

Choi

et al. 2016

ACS Appl. Mater. Interfaces

104

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“…We used XRD spectroscopy to examine the difference in chemical periodicity upon grafting CNT–COOH with U moieties ( Figure 3 ). The characteristic peaks of CNT–COOH and CNT–U appeared at values of 2 θ of 26°, 29°, 43°, and 45°, assigned to the distinguishable (002), (220), (100), and (101) planes, respectively [ 24 , 25 , 28 ]. Interestingly, the XRD pattern of CNT–U featured a broad peak at 18°–19° that was not present for CNT–COOH.…”

Section: Resultsmentioning

confidence: 99%

“…The resulting mixture was heated under reflux at 80 °C with vigorous stirring for 24 h. The crude product was subjected to PTFE filtration (Poly(tetrafluoroethylene) membrane, Merck KGaA, Darmstadt, Germany) and centrifugation (3000 rpm, 5 min) to produce CNT–U. Fourier transform infrared (FTIR) spectroscopy ( Figure S2 ): 3200–3400 cm −1 (NH stretching), 1650 (C=O) cm −1 [ 22 , 23 ]; Raman spectroscopy ( Figure S3 ): 1580 cm −1 (intense G band; Raman-allowed phonon high-frequency mode), 1350 cm −1 (disordered-induced D band, presumably originating from defects in the curved graphene sheets and tube ends [ 24 , 25 ]).…”

Section: Methodsmentioning

confidence: 99%

Bio-Inspired Supramolecular Chemistry Provides Highly Concentrated Dispersions of Carbon Nanotubes in Polythiophene

et al. 2016

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In this paper we report the first observation, through X-ray diffraction, of noncovalent uracil–uracil (U–U) dimeric π-stacking interactions in carbon nanotube (CNT)–based supramolecular assemblies. The directionally oriented morphology determined using atomic force microscopy revealed highly organized behavior through π-stacking of U moieties in a U-functionalized CNT derivative (CNT–U). We developed a dispersion system to investigate the bio-inspired interactions between an adenine (A)-terminated poly(3-adeninehexyl thiophene) (PAT) and CNT–U. These hybrid CNT–U/PAT materials interacted through π-stacking and multiple hydrogen bonding between the U moieties of CNT–U and the A moieties of PAT. Most importantly, the U···A multiple hydrogen bonding interactions between CNT–U and PAT enhanced the dispersion of CNT–U in a high-polarity solvent (DMSO). The morphology of these hybrids, determined using transmission electron microscopy, featured grape-like PAT bundles wrapped around the CNT–U surface; this tight connection was responsible for the enhanced dispersion of CNT–U in DMSO.

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“…Admicellar polymerization was first employed modifying CNT in order to enhance their dispersion inside a polyacrylonitrile matrix . Of particular note, water‐soluble polymers polyacrylic acid (PAA) and polyvinyl acetate (PVAc) and copolymer of PAA and PVAc have been used to prepare water‐dispersed CNT by admicellar polymerization . These same polymers, PAA and PVAc, were selected to prepare water‐dispersed CNT in this study.…”

Section: Introductionmentioning

confidence: 99%

Colloidal Stability in Water of Modified Carbon Nanotube: Comparison of Different Modification Techniques

Seneewong-Na-Ayutthaya

Pongprayoon

O’Rear

2016

Macro Chemistry & Physics

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The colloidal stability of carbon nanotube (CNT) in water is an important property for several applications. Three different functionalization approaches defined as nondestructive techniques have been carried out to modify the CNT surface and the product CNT compared. First, admicellar polymerization is used to form a water‐soluble polymer on CNT with two different polymers, polyacrylic acid and polyvinyl acetate (PVAc). Second, coatings of soluble biopolymers are applied using dextran and chitosan. Third, mild acid oxidation conditions from the literature are employed with hydrogen peroxide (H2O2) and with potassium permanganate (KMnO4) as oxidizing agents. The colloidal stability of modified CNT is examined by sedimentation and by turbidity measurements along with laser particle size analysis. Thermogravimetric Analysis, energy dispersive X‐ray analysis, scanning electron microscope, and transmission electron microscopy are used to confirm that modification of the CNT is successfully implemented with each technique. Lastly, FT‐Raman is used to assess damage to the CNT structure after modification. A focus of the turbidity measurements is quantitative analysis using numerical integration of variability to evaluate colloidal stability. All modified CNT samples clearly yield improved aqueous dispersions. For each of the three approaches, the better option is KMnO4 for mild acid oxidation, PVAc for admicellar polymerization, and chitosan for biopolymer deposition.

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Water-dispersible carbon nanotube prepared by non-destructive functionalization technique of admicellar polymerization

Cited by 12 publications

References 31 publications

Synergistic Ultrathin Functional Polymer-Coated Carbon Nanotube Interlayer for High Performance Lithium–Sulfur Batteries

Synergistic Ultrathin Functional Polymer-Coated Carbon Nanotube Interlayer for High Performance Lithium–Sulfur Batteries

Bio-Inspired Supramolecular Chemistry Provides Highly Concentrated Dispersions of Carbon Nanotubes in Polythiophene

Colloidal Stability in Water of Modified Carbon Nanotube: Comparison of Different Modification Techniques

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