研究目的
To demonstrate that a high percentage of charge carriers in redox-doped semiconducting single-walled carbon nanotube (s-SWCNT) networks is delocalized as a free carrier density in the π-electron system and to compare microwave and direct-current (DC) measurements of electrical conductivity.
研究成果
A significant fraction of charge carriers injected by physisorbed redox molecules into s-SWCNT networks (>50%) are delocalized in the π electron system as a free carrier density. The high value of delocalized charge carriers observed is related to the inherently low charge-transfer reorganization energy within s-SWCNTs, leading to efficient delocalization of charges away from the oppositely charged molecular counterion.
研究不足
The estimate for the percentage of delocalized charge carriers contains appreciable uncertainty due to the selection of literature values for optical cross section, exciton correlation length, and hole mobility.
1:Experimental Design and Method Selection:
Utilized microwave and direct-current (DC) measurements of electrical conductivity to probe the delocalization of charge carriers in redox-doped s-SWCNT networks.
2:Sample Selection and Data Sources:
Two types of (6,5) s-SWCNT samples were studied, doped p-type with triethyloxonium hexachloroantimonate (OA).
3:List of Experimental Equipment and Materials:
X-band microwave cavity, Cary 5000 optical spectrophotometer, atomic force microscope (Park Systems XE/70 Atomic Force Microscope), four-point probe method for DC conductivity measurement.
4:Experimental Procedures and Operational Workflow:
Films were doped p-type with OA, absorption measured, and conductivity measured using microwave and DC methods.
5:Data Analysis Methods:
Numerical simulations of the microwave cavity characteristics to extract conductance values, comparison of microwave and DC conductivity values.
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