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. 2016 Mar 21;6:23319. doi: 10.1038/srep23319

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(a) Transfer characteristics of an SWNT-FET at V_DS = 1.5 V before and after OA doping with a doping time (t₁) of 0.5 h, 1 h, and 5 h, respectively. (b) Transfer characteristics of an SWNT-FET at V_DS = 1.5 V before and after PEI doping with a doping time (t₂) of 1 h, 6 h, and 12 h, respectively.