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In-plane (a) Seebeck coefficient and (b) electrical conductivity as a function of the s-SWNT purity (red circles). (c) Seebeck coefficient as a function of electrical conductivity. PF of s-SWNT sheets as a function of (d) s-SWNT purity and (e) electrical conductivity. The TE values of the unsorted SWNT sheet are also plotted (black squares). Inset in (a) shows the photograph of free-standing 98% s-SWNT sheet. The blue dotted lines were added as eye guide.
