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Seebeck coefficient (a) and electrical conductivity (b) of the SWCNT (SW) and DWCNT (DW) films before and after PEI incorporation for two, three, and four days. PEI can convert SWCNT rather than DWCNT from p-type to n-type. Reproduced with permission from Ref. [75]. Copyright © Elsevier, 2011.
