Variable-temperature EPR spectroscopy showed that both P(TII-T) and P(TII-2FT) exhibited a decreasing trend in EPR signals as the temperature increased (Fig. 3f and Supplementary Fig. 20 ), suggesting the presence of a triplet high-spin ground state in both materials 39 , 40 .
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On-site biosignal amplification using a single high-spin conjugated polymer.
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