Improvement of transparent conducting nanotube films by addition of small quantities of graphene

Paul J. King; Umar Khan; Mustafa Lotya; Sukanta De; Jonathan N. Coleman

doi:10.1021/nn100542z

Improvement of transparent conducting nanotube films by addition of small quantities of graphene

Paul J. King, Umar Khan, Mustafa Lotya, Sukanta De, Jonathan N. Coleman

Trinity College Dublin

Research output: Contribution to journal › Article › peer-review

114 Citations (Scopus)

Abstract

We demonstrate a water-based method to prepare transparent, conducting graphene/single-walled nanotube hybrid films. While the transmittance decreases slightly with increasing graphene content, the DC conductivity, σ_DC, and sheet resistance scale non-monotonically with film composition. We observe an optimum composition of ∼3 wt % graphene, which results in a peak in the DC conductivity. We have calculated the figure of merit, the DC to optical conductivity ratio, σ_DC/ σ_Op, which also shows a peak at this composition. We find that this effect is only present for small graphene flakes. In addition, acid treatment increases both the σ_DC and σ_DC/ σ_Op by × - 2.5. Interestingly, acid treatment is more effective for films close to the optimum composition. This has the effect of sharpening the peaks in both σ_DC and σ_DC/ σ_Op. For acid-treated films, addition of 3 wt % graphene results in a 40% increase in σ_DC/σ_Op compared to the nanotube-only film, from 12.5 to 18. Optimized, acid-treated films display transmittance of 80% coupled with a sheet resistance of 100 Ω/□.

Original language	English
Pages (from-to)	4238-4246
Number of pages	9
Journal	ACS Nano
Volume	4
Issue number	7
DOIs	https://doi.org/10.1021/nn100542z
Publication status	Published - 27 Jul 2010
Externally published	Yes

Keywords

graphene
hybrid
nanotube
resistance
transmittance
transparent conductor

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10.1021/nn100542z

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abstract = "We demonstrate a water-based method to prepare transparent, conducting graphene/single-walled nanotube hybrid films. While the transmittance decreases slightly with increasing graphene content, the DC conductivity, σDC, and sheet resistance scale non-monotonically with film composition. We observe an optimum composition of ∼3 wt % graphene, which results in a peak in the DC conductivity. We have calculated the figure of merit, the DC to optical conductivity ratio, σDC/ σOp, which also shows a peak at this composition. We find that this effect is only present for small graphene flakes. In addition, acid treatment increases both the σDC and σDC/ σOp by × - 2.5. Interestingly, acid treatment is more effective for films close to the optimum composition. This has the effect of sharpening the peaks in both σDC and σDC/ σOp. For acid-treated films, addition of 3 wt % graphene results in a 40% increase in σDC/σOp compared to the nanotube-only film, from 12.5 to 18. Optimized, acid-treated films display transmittance of 80% coupled with a sheet resistance of 100 Ω/□.",

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AU - Khan, Umar

AU - Lotya, Mustafa

AU - De, Sukanta

AU - Coleman, Jonathan N.

PY - 2010/7/27

Y1 - 2010/7/27

N2 - We demonstrate a water-based method to prepare transparent, conducting graphene/single-walled nanotube hybrid films. While the transmittance decreases slightly with increasing graphene content, the DC conductivity, σDC, and sheet resistance scale non-monotonically with film composition. We observe an optimum composition of ∼3 wt % graphene, which results in a peak in the DC conductivity. We have calculated the figure of merit, the DC to optical conductivity ratio, σDC/ σOp, which also shows a peak at this composition. We find that this effect is only present for small graphene flakes. In addition, acid treatment increases both the σDC and σDC/ σOp by × - 2.5. Interestingly, acid treatment is more effective for films close to the optimum composition. This has the effect of sharpening the peaks in both σDC and σDC/ σOp. For acid-treated films, addition of 3 wt % graphene results in a 40% increase in σDC/σOp compared to the nanotube-only film, from 12.5 to 18. Optimized, acid-treated films display transmittance of 80% coupled with a sheet resistance of 100 Ω/□.

AB - We demonstrate a water-based method to prepare transparent, conducting graphene/single-walled nanotube hybrid films. While the transmittance decreases slightly with increasing graphene content, the DC conductivity, σDC, and sheet resistance scale non-monotonically with film composition. We observe an optimum composition of ∼3 wt % graphene, which results in a peak in the DC conductivity. We have calculated the figure of merit, the DC to optical conductivity ratio, σDC/ σOp, which also shows a peak at this composition. We find that this effect is only present for small graphene flakes. In addition, acid treatment increases both the σDC and σDC/ σOp by × - 2.5. Interestingly, acid treatment is more effective for films close to the optimum composition. This has the effect of sharpening the peaks in both σDC and σDC/ σOp. For acid-treated films, addition of 3 wt % graphene results in a 40% increase in σDC/σOp compared to the nanotube-only film, from 12.5 to 18. Optimized, acid-treated films display transmittance of 80% coupled with a sheet resistance of 100 Ω/□.

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KW - transparent conductor

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Improvement of transparent conducting nanotube films by addition of small quantities of graphene

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Keywords

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