3:15 PM - 3:30 PM
△ [20p-234B-8] Thermoelectric Properties of SWNT Sheets with Different Semiconducting SWNT Ratio
Keywords:Semiconducting carbon nanotubes, Thermoelectric conversion, Thermal conductivity
SWNTs have attracted strong attentions as thermoelectric (TE) material due to their extremely high electrical conductivity (σ), light weight, mechanical toughness and flexibility. Especially, s-SWNT sheet is proved to have large S theoretically and experimentally [1, 2]. However, the improvement of ZT value by separating s-SWNT from the as-produced SWNT mixture is still uncertain. In this study, we characterized the TE properties of s-SWNT sheets with different s-SWNT ratio and compared their ZT values with that of the unsorted SWNT sheet.
As for the experiment, s-SWNTs 2.4 mg (98% Nanointegris) and m-SWNT 0.6 mg (98% Nanointegris) were added to 0.5% SDBS solution and dispersed by bath sonicator (BRANSON, 1 hr) and probe sonicator (TOMY UD-200). The dispersion were filtrated and the free-standing s-:m-SWNT=4:1 sheet was obtained (80% s-SWNT). 98% s-SWNT sheet, s:m-SWNT=2:1 sheet (67% s-SWNT), s:m-SWNT=1:2 sheet (33% s-SWNT), and 2% s-SWNT sheets were made in the same fashion. In-plane electrical conductivity and Seebeck coefficient of the sheets were measured by ZEM-3 (ADVANCE RIKO) from 30 to 100 ℃. The specific heat capacity (Cp) was measured by differential scanning calorimetry (DSC) method using EXSTAR DSC 6200 (SII Nanotechnology) at the heating rate of 10 K min-1. In-plane thermal diffusivity (α) were evaluated using a Thermowave Analyzer TA (Bethel Co., Ltd.,). Density (ρ) was calculated from the weight and volume of the sheets.
[1] Ferguson, A. J. et al, Nature Energy, 1, 16033 (2016) [2] Maniwa, Y. et al, Appl. Phys. Express, 7, 025103 (2014)
As for the experiment, s-SWNTs 2.4 mg (98% Nanointegris) and m-SWNT 0.6 mg (98% Nanointegris) were added to 0.5% SDBS solution and dispersed by bath sonicator (BRANSON, 1 hr) and probe sonicator (TOMY UD-200). The dispersion were filtrated and the free-standing s-:m-SWNT=4:1 sheet was obtained (80% s-SWNT). 98% s-SWNT sheet, s:m-SWNT=2:1 sheet (67% s-SWNT), s:m-SWNT=1:2 sheet (33% s-SWNT), and 2% s-SWNT sheets were made in the same fashion. In-plane electrical conductivity and Seebeck coefficient of the sheets were measured by ZEM-3 (ADVANCE RIKO) from 30 to 100 ℃. The specific heat capacity (Cp) was measured by differential scanning calorimetry (DSC) method using EXSTAR DSC 6200 (SII Nanotechnology) at the heating rate of 10 K min-1. In-plane thermal diffusivity (α) were evaluated using a Thermowave Analyzer TA (Bethel Co., Ltd.,). Density (ρ) was calculated from the weight and volume of the sheets.
[1] Ferguson, A. J. et al, Nature Energy, 1, 16033 (2016) [2] Maniwa, Y. et al, Appl. Phys. Express, 7, 025103 (2014)