Microwave-assisted rapid synthesis of Sb2Te3 nanosheets and thermoelectric properties of bulk samples prepared by spark plasma sintering
Microwave-assisted rapid synthesis of Sb2Te3 nanosheets and thermoelectric properties of bulk samples prepared by spark plasma sintering
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DOI：
10.1039/b915107a
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发表时间：
2010-01-01
影响因子：
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通讯作者：
Chen, Li-Dong
中科院分区：
文献类型：
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作者：
Dong, Guo-Hui;Zhu, Ying-Jie;Chen, Li-Dong
以SbCl3、Na2TeO_3和水合肼为原料，在200℃的乙二醇水溶液中，用微波辅助法制备了边长300~500 nm、厚度50~70 nm的Sb2Te3单晶纳米片，并对其反应机理进行了探讨。采用放电等离子烧结(SPS)法制备了Sb_2Te_3纳米片的块体样品，经放电等离子烧结和热电性能测试表明，Sb_2Te_3纳米片仍为Sb_2Te_3纳米片。在420K下获得了高电导率(2.49×10(4)欧米伽(-1)m(-1)m(-1))、高塞贝克系数S(210muVK-1)和低导热系数kappa(0.76Wm(-1)K-1)。首次报道了由纳米片状粉末制备的Sb2Te3烧结体样品的ZT值，并在420K下获得了较高的ZT值0.58。S在烧结后没有明显的纳米晶生长，很难获得高的电导率，在此我们做了一次成功的尝试。
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.