Abstract
Single-wall carbon nanotubes (SWCNTs) and Bi2Te3 nanoplates are very promising thermoelectric materials for energy harvesting. When these two materials are combined, the resulting nanocomposites exhibit high thermoelectric performance and excellent flexibility. However, simple mixing of these materials is not effective in realizing high performance. Therefore, we fabricated integrated nanocomposites by adding SWCNTs during solvothermal synthesis for the crystallization of Bi2Te3 nanoplates and prepared flexible integrated nanocomposite films by drop-casting. The integrated nanocomposite films exhibited high electrical conductivity and an n-type Seebeck coefficient owing to the low contact resistance between the nanoplates and SWCNTs. The maximum power factor was 1.38 μW/(cm K2), which was 23 times higher than that of a simple nanocomposite film formed by mixing SWCNTs during drop-casting, but excluding solvothermal synthesis. Moreover, the integrated nanocomposite films maintained their thermoelectric properties through 500 bending cycles.
Highlights
Single-wall carbon nanotubes (SWCNTs) and Bi2Te3 nanoplates are very promising thermoelectric materials for energy harvesting
Jin et al developed flexible thermoelectric materials by fabricating a hybrid nanocomposite comprising highly ordered Bi2Te3 nanocrystals anchored on an single-walled CNTs (SWCNTs) network using magnetron sputtering[28]
The mass concentration of carbon derived from SWCNTs in the integrated nanocomposite films can be obtained by subtracting from that of the sample with no SWCNTs
Summary
Single-wall carbon nanotubes (SWCNTs) and Bi2Te3 nanoplates are very promising thermoelectric materials for energy harvesting. The integrated nanocomposite films exhibited high electrical conductivity and an n-type Seebeck coefficient owing to the low contact resistance between the nanoplates and SWCNTs. The maximum power factor was 1.38 μW/(cm K2), which was 23 times higher than that of a simple nanocomposite film formed by mixing SWCNTs during drop-casting, but excluding solvothermal synthesis. In order to decrease the contact resistance and improve the thermoelectric properties of the nanocomposite materials, it is necessary to integrate the SWCNTs and Bi2Te3 nanoplates. Jin et al developed flexible thermoelectric materials by fabricating a hybrid nanocomposite comprising highly ordered Bi2Te3 nanocrystals anchored on an SWCNT network using magnetron sputtering[28] These pioneering studies motivated us to fabricate integrated nanocomposites of SWCNTs and Bi2Te3 nanoplates using a solvothermal synthesis and to produce flexible thin films with the nanocomposites
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