Potassium Doped Single Wall Carbon Nanotubes: Resistance under Pressure |
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Authors: | Dmitry E. Sklovsky Vera A. Nalimova John E. Fischer |
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Affiliation: | 1. Department of Chemistry &2. Physics of High Pressures , Moscow State University , Moscow , 119899 , Russia;3. Department of Materials Science and Engineering and Laboratory for Research on the Structure of Matter , University of Pennsylvania , Philadelphia , PA , 19104 , USA |
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Abstract: | Abstract We report in situ measurements of four-probe de resistance (R) of K-doped purified single wall carbon nanotube (SWNT) “buckypaper” as a function of quasi-hydrostatic pressure. Doped samples show completely different behavior compared to that of pristine nanotubes in the pressure range up to 90 kbar. The characteristic increase in the resistance of pristine buckypaper above 10 kbar, associated with the formation of kinks or/and twists of tubes, is not observed in K-doped samples. This may originate from 1) a substantial change in electronic band structure of donor intercalated nanotubes, 2) completely different transport properties of defect structures, or 3) higher stiffness of doped SWNT's which prevents formation of kinks and twists in this pressure range. On deintercalation, the pristine behavior of R(P) is restored, establishing the reversibility of potassium vapor-transport doping. |
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Keywords: | carbon nanotubes transport properties deformations high pressure potassium intercalation |
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