Improvement of Transparent Conducting Nanotube Films by Addition of Small Quantities of Graphene
Improvement of Transparent Conducting Nanotube Films by Addition of Small Quantities of Graphene
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DOI：
10.1021/nn100542z
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发表时间：
2010-07-01
期刊：
影响因子：
17.1
通讯作者：
Coleman, Jonathan N.
中科院分区：
文献类型：
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作者：
King, Paul J.;Khan, Umar;Coleman, Jonathan N.
我们展示了一种水基方法来制备透明的，导电的石墨烯/单壁纳米管杂化膜。虽然透射率随着石墨烯含量的增加而略微降低，但是DC电导率、am和薄层电阻随着膜组成而非单调地缩放。我们观察到类似于3wt%石墨烯的最佳组成，这导致DC电导率的峰值。我们已经计算了品质因数，DC与光学电导率之比，sigma（DC）/sigma（Op），其也在该组成处显示出峰值。我们发现，这种效应只存在于小的石墨烯薄片。此外，酸处理使σ（DC）和σ（DC）/σ（Op）增加了2.5倍。有趣的是，酸处理对于接近最佳组成的膜更有效。这具有使sigma（DC）和sigma（DC）/sigma（Op）中的峰值锐化的效果。对于酸处理的膜，与仅纳米管的膜相比，添加3重量%石墨烯导致σ（DC）/σ（Op）增加40%，从12.5增加到18。经过优化的酸处理薄膜显示出80%的透射率以及100 Ω/平方的薄层电阻。
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, am, and sheet resistance scale non-monotonically with film composition. We observe an optimum composition of similar to 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, sigma(DC)/sigma(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 sigma(DC) and sigma(DC)/sigma(Op) by x 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 sigma(DC) and sigma(DC)/sigma(Op). For acid-treated films, addition of 3 wt % graphene results in a 40% increase in sigma(DC)/sigma(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 Omega/square.