Zeta-Potential Measurements of Surfactant-Wrapped Individual Single-Walled Carbon Nanotubes

White, Brian E.; Banerjee, Sarbajit; O’Brien, Stephen; Turro, Nicholas J.; Herman, Irving P.

doi:10.1021/jp070853e

Cited by 367 publications

(312 citation statements)

References 29 publications

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“…Hence, we apply the Smoluchowski approximation in our measurements 24 ; this is in line with previous work on carbon nanotube dispersions in SDBS. 17,22 The natural pH of our dispersions was 7.4, which matches a literature value for SDBS stabilised carbon nanotube dispersions. 22 We observed a zeta potential distribution for a fresh graphite/graphene dispersion centred at -44 mV ( Figure 5A).…”

Section: Resultssupporting

confidence: 84%

“…17,22 The natural pH of our dispersions was 7.4, which matches a literature value for SDBS stabilised carbon nanotube dispersions. 22 We observed a zeta potential distribution for a fresh graphite/graphene dispersion centred at -44 mV ( Figure 5A). The shoulder at -76 mV is probably due to free surfactant, as it matches well to the position of the zeta spectrum of a 0.5 mg/ml SDBS solution at -71 mV ( Figure 5A).…”

Section: Resultssupporting

confidence: 84%

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Liquid Phase Production of Graphene by Exfoliation of Graphite in Surfactant/Water Solutions

et al. 2009

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We have demonstrated a method to disperse and exfoliate graphite to give graphene suspended in water-surfactant solutions. Optical characterisation of these suspensions allowed the partial optimisation of the dispersion process. Transmission electron microscopy showed the dispersed phase to consist of small graphitic flakes. More than 40% of these flakes had <5 layers with ~3% of flakes consisting of monolayers. These flakes are stabilised against reaggregation by Coulomb repulsion due to the adsorbed surfactant. However, the larger flakes tend to sediment out over ~6 weeks, leaving only small flakes dispersed. It is possible to form thin films by vacuum filtration of these dispersions. Raman and IR spectroscopic analysis of these films suggests the flakes to be largely free of defects and oxides. The deposited films are reasonably conductive and are semi-transparent. Further improvements may result in the development of cheap transparent conductors.

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Section: Resultssupporting

confidence: 84%

Section: Resultssupporting

confidence: 84%

Liquid Phase Production of Graphene by Exfoliation of Graphite in Surfactant/Water Solutions

et al. 2009

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“…As discussed in section 2.2, this is the electric potential at the edge of the bound surfactant tail groups and is proportional to the effective charge on the coated nanotube [91] . If Coulomb repulsion is important for surfactant stabilised nanotube dispersions, then the dispersion quality would be expected to scale with the zeta potential.…”

Section: Importance Of Zeta Potentialmentioning

confidence: 99%

Liquid‐Phase Exfoliation of Nanotubes and Graphene

Coleman

2009

Adv Funct Materials

600

536

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Many applications of carbon nanotubes require the exfoliation of the nanotubes to give individual tubes in the liquid phase. This requires the dispersion, exfoliation and stabilisation of nanotubes in a variety of liquids. In this paper we review recent work in this area, focusing on results from the author's group. We begin by reviewing stabilisation mechanisms before exploring research into the exfoliation of nanotubes in solvents, by using surfactants or biomolecules and by covalent attachment of molecules.The concentration dependence of the degree of exfoliation in each case will be highlighted. In addition we will discuss research into the dispersion mechanism for each dispersant type. Most importantly we have compared dispersion quality metrics for all dispersants. From this analysis, we conclude that functionalised nanotubes can be exfoliated to the greatest degree. Finally, we review the extension of this work to the liquid phase exfoliation of graphite to give graphene.

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“…We hypothesized that the self-assembly structures in sol-gel chemistry [20,21] can play a role as dispersants for SWCNT. The dispersion stability arises from electrostatic repulsive interactions between charged SWCNT [22].…”

Section: Introductionmentioning

confidence: 99%

Sol–gel chemistry mediated Zn/Al-based complex dispersant for SWCNT in water without foam formation

Kukobat

Minami

Hayashi

et al. 2015

Carbon

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We report a bimetallic Zn/Al complex as an efficient inorganic dispersant for SWCNT, synthesized from Zn(CH3COO)2 and Al(NO3)3. The Zn/Al complex shows more than four times greater efficiency at dispersing SWCNT than widely used surfactants (CTAB and SDS). Besides remarkable dispersibility, the Zn/Al complex does not foam upon any shaking treatment and it can be used just after quick dissolution of the powdered form, which is a marked advantage over surfactants. The Zn/Al complex, containing amorphous Al(CH3COO)3 and a complex of Zn 2+and NO 3 − ions, should have a unique dispersion mechanism, differing from the surfactants.Al(CH3COO)3 has higher affinity for SWCNT than ions, adsorbing onto their surface in the first layer and attracting Zn 2+ and NO 3 − ions. Charge transfer interactions between the Zn/Al complex and SWCNT as evidenced by optical absorption spectroscopy should induce a charge on SWCNT; the zeta potential of such coated SWCNT was +55 mV, which is in agreement with the high stability of SWCNT in water. Hence, the Zn/Al complex can widen the applications of SWCNT to various technologies such as the transparent and conductive films, as well as high performance composite polymers.

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Zeta-Potential Measurements of Surfactant-Wrapped Individual Single-Walled Carbon Nanotubes

Cited by 367 publications

References 29 publications

Liquid Phase Production of Graphene by Exfoliation of Graphite in Surfactant/Water Solutions

Liquid Phase Production of Graphene by Exfoliation of Graphite in Surfactant/Water Solutions

Liquid‐Phase Exfoliation of Nanotubes and Graphene

Sol–gel chemistry mediated Zn/Al-based complex dispersant for SWCNT in water without foam formation

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