Type

Journal Article

Authors

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

Subjects

Physics

Topics
optical single walled conducting transparent films water nanotube improvement graphene

Improvement of transparent conducting nanotube films by addition of small quantities of graphene. (2010)

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, sigma(DC), and sheet resistance scale non-monotonically with film composition. We observe an optimum composition of approximately 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, sigmaDC/sigmaOp, 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 sigmaDC and sigmaDC/sigmaOp by x2.5. Interestingly, acid treatment is more effective for films close to the optimum composition. This has the effect of sharpening the peaks in both sigmaDC and sigmaDC/sigmaOp. For acid-treated films, addition of 3 wt % graphene results in a 40% increase in sigmaDC/sigmaOp 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].
Collections Ireland -> Trinity College Dublin -> PubMed

Full list of authors on original publication

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

Experts in our system

1
Jonathan Coleman
Trinity College Dublin
Total Publications: 217
 
2
Mustafa Lotya
Trinity College Dublin
Total Publications: 19
 
3
Umar Khan
Trinity College Dublin
Total Publications: 37
 
4
Paul J King
Trinity College Dublin
Total Publications: 15