期刊
ACS NANO
卷 5, 期 10, 页码 7885-7892出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn202868a
关键词
thermoelectric; carbon nanotube; organic composite; power factor; polymer
类别
资金
- U.S. Air Force Office of Scientific Research under Dr. Charles Lee, and the Pioneer Research Center through the National Research Foundation of Korea [FA9550-09-1-0609, 2011-0001645]
- Ministry of Education, Science and Technology
- National Research Foundation of Korea [2009-0083007] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Typical organic materials have low thermal conductivities that are best suited to thermoelectrics, but their poor electrical properties with strong adverse correlations have prevented them from being feasible candidates. Our composites, containing single-wall carbon nanotubes, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) and/or polyvinyl acetate, show thermo-powers weakly correlated with electrical conductivities, resulting in large thermoelectric power factors in the in-plane direction of the composites, similar to 160 mu W/m.K-2 at room temperature, which are orders of magnitude larger than those of typical polymer composites. Furthermore, their high electrical conductivities, similar to 10(5) S/m at room temperature, make our composites very promising for various electronic applications. The optimum nanotube concentrations for better power factors were identified to be 60 wt % with 40 wt % polymers. It was noticed that high nanotube concentrations above 60 wt % decreased the electrical conductivity of the composites due to less effective nanotube dispersions. The thermal conductivities of our 60 wt % nanotube composites In the out-of-plane direction were measured to be 0.2-0.4 W/m.K at room temperature. The in-plane thermal conductivity and thermal contact conductance between nanotubes were also theoretically estimated.
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