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High electric conductivity ~100 MegaSiemens/m and Seebeck coefficient >200mkV/K of carbon nanotubes (CNT) make them attractive for a variety ofapplications. Unfortunately, a high thermal conductivity ~ 3000 W/(m*K) due tothe phonon transport limits their capability for transforming energy betweenthe heat and electricity. Here we show that increasing the charge carrierconcentrations not only leads to an increase of both electric conductivity andSeebeck coeffcient, but also causes a substantial suppression of the thermalconductivity due to intensifying the phonon-electron collisions. A strongtransduction effect corresponding to an effective electron temperature change~115 K was observed in a CNT device, where the local gate electrodes havecontrolled the charge doping in the opposite ends. Transduction between theheat and the energy of the electron subsystem corresponds to an impressivefigure of merit cold ZT ~ 6 and the transduced power density P ~ 80kW/cm2.

Transduction between electrical energy and the heat in a carbon nanotube using a voltage-controlled doping