Absorption spectroscopy of surfactant-dispersed carbon nanotube film: Modulation of electronic structures

Geng, Hong-Zhang; Lee, Dae Sik; Kim, Ki Kang; Han, Gang; Park, Hyeon Ki; Lee, Young Hee

doi:10.1016/j.cplett.2008.02.102

Cited by 126 publications

(110 citation statements)

References 20 publications

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“…As can be seen after functionalization, the bundling size of MWCNTs is reduced and nanotubes are dispersed well. Figure 3d suggests that dye molecules and/or dye molecules aggregates are attached to nanotubes, as indicated by the blue arrows; similar phenomena have been observed with the sodium dodecyl sulfate functionalized nanotubes [14]. Additionally, many circular features with diameter of about 0.6 nm can be observed on nanotube surfaces in the HRTEM image (inset to Fig.…”

Section: Nmr Spectrasupporting

confidence: 50%

The effects of phenolic hydrogens and methyl substitute groups in organic dyes on their dispersion of multiple-walled carbon nanotubes

Zhang

Silva

2010

Carbon

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Section: Nmr Spectrasupporting

confidence: 50%

The effects of phenolic hydrogens and methyl substitute groups in organic dyes on their dispersion of multiple-walled carbon nanotubes

Zhang

Silva

2010

Carbon

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“…This expression has previously been shown to accurately describe films of both carbon nanotubes 20 and polymer-nanotube composites 7 . This expression has been fitted to the data in figure 2B and provides a reasonable fit for M/A>70 mg/m 2 .…”

Section: Resultsmentioning

confidence: 99%

“…Previous work has demonstrated a maximum value of by σ DC /σ Op =25 for acid treated films of SWNTs. 20 We can illustrate this by plotting on figure 2B data measured in our lab for near state-of-the-art nanotube films (Iljin Nanotech, no post-treatment 30 ). This data is described by σ DC /σ Op =13, significantly worse than that displayed by the AgNW films.…”

Section: Resultsmentioning

confidence: 99%

“…These are known to be stable under flexing 7 and can be spray cast 8 , opening the way to large area deposition. While polymer 9 and graphene [10][11][12][13][14][15] films have been studied, the most common material used to date has been carbon nanotubes 7,8,[16][17][18][19][20][21][22][23][24][25][26][27] . While the cost associated with nanotubes is still a factor, it is expected to come down as demand increases to industrial levels.…”

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confidence: 99%

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Silver Nanowire Networks as Flexible, Transparent, Conducting Films: Extremely High DC to Optical Conductivity Ratios

et al. 2009

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We have used aqueous dispersions of silver nanowires to prepare thin, flexible, transparent, conducting films. The nanowires are of length and diameter close to 6.5 µm and 85 nm respectively. At low thickness, the films consist of networks but appear to become bulk-like for mean film thicknesses above ~160 nm. These films can be very transparent with optical transmittance reaching as high as 92% for low thickness. The transmittance (550 nm) decreases with increasing thickness, consistent with an optical conductivity of 6472 S/m. The films are also very uniform; the transmittance varies spatially by typically <2%. The sheet resistance decreases with increasing thickness, falling below 1 Ω/ for thicknesses above 300 nm. The DC conductivity increases from 2×10 5 S/m for very thin films before saturating at 5×10 6 S/m for thicker films.Similarly, the ratio of DC to optical conductivity increases with increasing thickness from 25 for the thinnest films, saturating at ~500 for thicknesses above ~160 nm. We believe this is the highest conductivity ratio ever observed for nanostructured films and is matched only by doped metal oxide films. These nanowire films are electromechanically very robust, with all but the thinnest films showing no change in sheet resistance when flexed over >1000 cycles. Such results make these films ideal as replacements for indium tin oxide as transparent electrodes. We have prepared films with optical transmittance and sheet resistance of 85% and 13 Ω/ respectively. This is very close to that displayed by commercially available indium tin oxide.

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“…For example, although thin transparent films have successfully been produced from surfactant / nanotubes dispersions [85,86] , post treatment with acids is required to remove residual surfactant. [87] In this section, we focus on the observation that the exfoliation state of nanotubes/surfactant dispersions scales with concentration. We use this to develop metrics to describe the quality of the dispersion.…”

Section: Surfactant Stabilisation Of Nanotubesmentioning

confidence: 99%

Liquid‐Phase Exfoliation of Nanotubes and Graphene

Coleman

2009

Adv Funct Materials

592

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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Absorption spectroscopy of surfactant-dispersed carbon nanotube film: Modulation of electronic structures

Cited by 126 publications

References 20 publications

The effects of phenolic hydrogens and methyl substitute groups in organic dyes on their dispersion of multiple-walled carbon nanotubes

The effects of phenolic hydrogens and methyl substitute groups in organic dyes on their dispersion of multiple-walled carbon nanotubes

Silver Nanowire Networks as Flexible, Transparent, Conducting Films: Extremely High DC to Optical Conductivity Ratios

Liquid‐Phase Exfoliation of Nanotubes and Graphene

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