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Piezoresistive characteristics of single wall carbon nanotube/polyimide nanocomposites |
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| Authors: | Jin Ho Kang Cheol Park Jonathan A Scholl Amy H Brazin Nancy M Holloway James W High Sharon E Lowther Joycelyn S Harrison |
| Institution: | 1. National Institute of Aerospace, MS 226, 6 West Taylor Street, Hampton, Virginia 23681‐2199;2. Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904;3. Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544‐5263;4. Aeronautics and Astronautics Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139‐4307;5. MS 390, 1A East Durand Street, Fabrication Technology Development Branch, Electronics Applications Technology Section, NASA Langley Research Center, Hampton, Virginia 23681‐2199;6. MS 488, 1A East Durand Street, Electronic Systems Branch, NASA Langley Research Center, Hampton, Virginia 23681‐2199;7. MS 226, 6 West Taylor Street, Advanced Materials and Processing Branch, NASA Langley Research Center, Hampton, Virginia 23681‐2199 |
| Abstract: | A systematic study of the effect of single wall carbon nanotubes (SWCNTs) on the enhanced piezoresistive sensitivity of polyimide nanocomposites from below to above percolation was accomplished. The maximum piezoresistive stress coefficient (Π) of 1.52 × 10?3 MPa?1 was noted at just above the percolation threshold concentration (Φ ～ 0.05 wt %) of SWCNT. This coefficient value exceeds those of metallic piezoresistive materials by two orders of magnitude (4.25 × 10?5 MPa?1 for aluminum). The high piezoresistive characteristics appear to originate from a change in the intrinsic resistivity of the composite caused by the variation of the tunneling distance between conducting inclusions (SWCNTs) under compression or tension. © 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 994–1003, 2009 |
| Keywords: | carbon nanotubes composites high performance polymers piezoresistance polyimides |