Type

Journal Article

Authors

John Boland
Werner Blau
Jonathan Coleman

Subjects

Physics

Topics
optical transmission thin films thick film conductive films transparent films physics single walled nanotubes optical quality

The spatial uniformity and electromechanical stability of transparent, conductive films of single walled nanotubes (2009)

Abstract We have prepared thin films of arc discharge single walled nanotubes by vacuum filtration. For film thicknesses greater than 40 nm, the films are of high optical quality; the optical transmission varies by <2% over the film area when measured with a spatial resolution of 4 ?m. However, the films become spatially non-uniform for film thickness below 40 nm. The in-plane DC conductivity correlates with the uniformity, increasing from 3800 S/m for a 10 nm thick film to 2?2.5 ? 105 S/m for films of thickness >40 nm. Conductive atomic force microscopy maps show reasonably uniform current flow out of the plane of the film. For all thicknesses, the optical transmittance scales with film thickness as expected for a thin conducting film with optical conductivity of 1.7 ? 104 S/m (? = 550 nm). For films with t > 40 nm the ratio of DC to optical conductivity was ?DC/?Op = 13.0, leading to values of transmittance and sheet resistance such as T = 80% and Rs = 110 ?/? for the t = 40 nm film. Electromechanically, these films were very stable showing conductivity changes of <5% and <2% when cycled over 2000 times in compression and tension respectively.
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Full list of authors on original publication

John Boland, Werner Blau, Jonathan Coleman

Experts in our system

1
John J Boland
Trinity College Dublin
Total Publications: 82
 
2
Werner Blau
Trinity College Dublin
Total Publications: 109
 
3
Jonathan Coleman
Trinity College Dublin
Total Publications: 217