Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 20, Issue 10, Pages 1976-1981Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b915107a
Keywords
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Funding
- National Natural Science Foundation of China [50821004, 50772124]
- Program of Shanghai Subject Chief Scientist [07XD14031]
- Science and Technology Commission of Shanghai [0852nm05800]
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Sb2Te3 single-crystalline nanosheets having edge lengths of 300-500 nm and thicknesses of 50-70 nm were rapidly synthesized by a microwave-assisted method using SbCl3, Na2TeO3 and hydrazine hydrate in ethylene glycol at 200 degrees C for 15 min, and the reaction mechanism was proposed. The bulk sample of Sb2Te3 nanosheets was prepared by spark plasma sintering (SPS), and it still consisted of Sb2Te3 nanosheets after SPS and thermoelectric property measurements. High electrical conductivity sigma (2.49 x 10(4) Omega(-1) m(-1)), high Seebeck coefficient S (210 mu V K-1) and low thermal conductivity kappa (0.76 W m(-1) K-1) at 420 K were achieved. The ZT value was reported for the first time for the Sb2Te3 sintered bulk sample prepared from nanosheet powder, and a relatively high ZT of 0.58 at 420 K was obtained. It is very difficult to achieve high electrical conductivity s without obvious growth of nanocrystals after sintering, and herein we have made a successful attempt.
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