Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 133, Issue 19, Pages 7450-7460Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja111687t
Keywords
-
Categories
Funding
- AFOSR [FA9550-08-1-0382, GRT00008581/RF60012388]
- MURI [444286-P061716]
- NSF [ECS-0601345, EFRI-BSBA 0938019, CBET 0933384, CBET 0932823, DMR-9871177]
- National Institutes of Health [NIH 1R21CAl21841-01A2]
- Center for Solar and Thermal Energy Conversion
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0000957]
Ask authors/readers for more resources
Single-walled carbon nanotube (SWNT) and other carbon-based coatings are being considered as replacements for indium tin oxide (ITO). The problems of transparent conductors (TCs) coatings from SWNT and similar materials include poor mechanical properties, high roughness, low temperature resilience, and fast loss of conductivity. The simultaneous realization of these desirable characteristics can be achieved using high structural control of layer-by-layer (LBL) deposition, which is demonstrated by the assembly of hydroethyl cellulose (HOCS) and sulfonated polyetheretherketone (SPEEK)-SWNTs. A new type of SWNT doping based on electron transfer from valence bands of nanotubes to unoccupied levels of SPEEK through pi-pi interactions was identified for this system. It leads to a conductivity of 1.1 x 10(s) S/m at 66 wt % loadings of SWNT. This is better than other polymer/SWNT composites and translates into surface conductivity of 920 Omega/square and transmittance of 86.7% at 550 nm. The prepared LBL films also revealed unusually high temperature resilience up to 500 degrees C, and low roughness of 3.5 nm (ITO glass -2.4 nm). Tensile modulus, ultimate strength, and toughness of such coatings are 13 +/- 2 GPa, 366 +/- 35 MPa, and 8 +/- 3 kJ/m(3), respectively, and exceed corresponding parameters of all similar TCs. The cumulative figure of merit, Pi(TC) which included the critical failure strain relevant for flexible electronics, was Pi(TC) = 0.022 and should be compared to Pi(TC) = 0.006 for commercial ITO. Further optimization is possible using stratified nanoscale coatings and improved doping from the macromolecular LBL components.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available