Rational Synthesis of Ultrathin n-Type Bi2Te3 Nanowires with Enhanced Thermoelectric Properties
Rational Synthesis of Ultrathin n-Type Bi2Te3 Nanowires with Enhanced Thermoelectric Properties
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DOI：
10.1021/nl202935k
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发表时间：
2012-01-01
期刊：
影响因子：
10.8
通讯作者：
Wu, Yue
中科院分区：
文献类型：
--
作者：
Zhang, Genqiang;Kirk, Benjamin;Wu, Yue
首次建立了合理且可扩展的溶液相方法，以高产率（高达 93%）获得平均直径为 8 nm 的 n 型 Bi2Te3 超细纳米线。研究了通过放电等离子烧结压缩纳米线粉末制造的块状颗粒的热电性能。与当前商用 n 型 Bi2Te3 基块体材料相比，我们的纳米线器件表现出 0.96 的增强 ZT，峰值为 380 K，这是由于块体颗粒中纳米级界面处声子散射产生的热导率显着降低，这相当于与最佳 n 型商用 Bi2Te2.7Se0.3 单晶（类似于 0.85）相比增强了 13％，并且与最佳报告结果相当。 n型Bi2Te2.7Se0.3样品（ZT = 1.04）由球磨粉末热压而成。纳米线的均匀性和高产率提供了一条有前途的途径，以可靠和可重复的方式为基于纳米技术的热电发电和固态冷却装置的制造做出重大贡献，这些装置具有卓越的性能。
A rational yet scalable solution phase method has been established, for the first time, to obtain n-type Bi2Te3 ultrathin nanowires with an average diameter of 8 nm in high yield (up to 93%). Thermoelectric properties of bulk pellets fabricated by compressing the nanowire powder through spark plasma sintering have been investigated. Compared to the current commercial n-type Bi2Te3-based bulk materials, our nanowire devices exhibit an enhanced ZT of 0.96 peaked at 380 K due to a significant reduction of thermal conductivity derived from phonon scattering at the nanoscale interfaces in the bulk pellets, which corresponds to a 13% enhancement compared to that of the best n-type commercial Bi2Te2.7Se0.3 single crystals (similar to 0.85)and is comparable to the best reported result of n-type Bi2Te2.7Se0.3 sample (ZT = 1.04) fabricated by the hot pressing of ball-milled powder. The uniformity and high yield of the nanowires provide a promising route to make significant contributions to the manufacture of nanotechnology-based thermoelectric power generation and solid-state cooling devices with superior performance in a reliable and a reproducible way.