▎ 摘　　要

Air-stable n-type organic thermoelectric (TE) materials with high power factor are needed to produce efficient, lightweight devices that could be self-powered by harnessing waste heat. Here, a completely organic n-type TE nanocomposite is achieved by depositing layers of double-walled carbon nanotubes (DWNT) stabilized with polyethylenimine (PEI) and graphene oxide (GO) in a layer-by-layer fashion from aqueous solutions. A 30 bilayer (BL) film (approximate to 610 nm thick), comprised of this DWNT-PEI/GO sequence, exhibits electrical conductivity of 27.3 S cm(-1) and a Seebeck coefficient of -30 mu V K-1, producing a power factor of 2.5 mu W m(-1) K-2. Low temperature thermal reduction (150 degrees C for 30 min) of this composite thin film significantly improves its thermoelectric performance. An electrical conductivity of 460 S cm(-1) and Seebeck coefficient of -93 mu V K-1 are achieved. A 30 BL DWNT-PEI/reduced graphene oxide (rGO) film (approximate to 480 nm thick) exhibits a power factor as large as 400 mu W m(-1) K-2, which is one of the highest values reported for an organic n-type material. By depositing layers containing montmorillonite clay on top, these n-type nanocomposites exhibit excellent air stability. This combination of air stability and high power factor could enable efficient thermoelectric devices on flexible substrates (e.g., clothing).