Effects of Preparation Methods on the Thermoelectric Performance of SWCNT/Bi2 Te3 Bulk Composites

Materials
Yuqi LiuShirley Z Shen

Abstract

Single-walled carbon nanotube (SWCNT)/Bi2Te3 composite powders were fabricated via a one-step in situ reductive method, and their corresponding bulk composites were prepared by a cold-pressing combing pressureless sintering process or a hot-pressing process. The influences of the preparation methods on the thermoelectric properties of the SWCNT/Bi2Te3 bulk composites were investigated. All the bulk composites showed negative Seebeck coefficients, indicating n-type conduction. A maximum power factor of 891.6 μWm-1K-2 at 340 K was achieved for the SWCNT/Bi2Te3 bulk composites with 0.5 wt % SWCNTs prepared by a hot-pressing process, which was ~5 times higher than that of the bulk composites (167.7 μWm-1K-2 at 300 K) prepared by a cold-pressing combing pressureless sintering process, and ~23 times higher than that of the bulk composites (38.6 μWm-1K-2 at 300 K) prepared by a cold-pressing process, mainly due to the enhanced density of the hot-pressed bulk composites.

References

Jan 26, 2008·Nature Materials·G Jeffrey Snyder, Eric S Toberer
Mar 8, 2016·Nature Communications·Maria IbáñezAndreu Cabot
Jul 30, 2016·Physical Review Letters·Nguyen T HungRiichiro Saito

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