Enhanced Electrical Conductivity of Carbon Nanotubes Wrapped with Conjugated Polymers via Sequential Cascade Doping
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Conjugated polymers (CPs) have been widely studied for their tunable electrical conductivity through chemical doping, though their conductivity still lags behind conventional metals. However, indoloindole-based CP (PIDF-BT) wrapped SWCNT improve the low charge carrier mobility of the CP, showing electrical conductivity in excess of 5000 S/cm. To achieve higher conductivity, our study evaluates various dopants' effects on PIDF-BT, identifying optimal combinations for cascade doping to enhance the doping efficiency of PIDF-BT@SWCNT. Specifically, employing F4TCNQ as the primary dopant followed by AuCl3 as the secondary dopant greatly enhances doping efficiency, outperforming individual dopants and achieving electrical conductivity over 6000 S/cm. These results provide valuable insights into optimizing dopant combinations for cascade doping, highlighting its benefits in improving both doping efficiency and electrical conductivity compared to single-dopant methods.