Large-Scale Synthesis and Characterization of the Size-Dependent Thermoelectric Properties of Uniformly Sized Bismuth Nanocrystals
Large-Scale Synthesis and Characterization of the Size-Dependent Thermoelectric Properties of Uniformly Sized Bismuth Nanocrystals
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DOI：
10.1002/anie.201005023
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发表时间：
2011-01-01
影响因子：
16.6
通讯作者：
Hyeon, Taeghwan
中科院分区：
文献类型：
--
作者：
Son, Jae Sung;Park, Kunsu;Hyeon, Taeghwan
高效热电材料因其在余热发电、环境友好制冷等领域的广泛应用而备受关注。[1]热电材料的效率一般用热电优值系数ZT=(σs2/k)T来评价，其中S为电导率，S为塞贝克系数，k为导热系数，T为绝对温度。最近，各种纳米结构热电材料被报道具有高的ZT值。热电效率的提高归因于界面散射声子的增加导致导热系数的降低或量子限制效应导致功率因数(σS2)的提高。[2]然而，大多数高ZT纳米结构材料都是通过昂贵而复杂的工艺制备的，这使得以低成本合成大量纳米结构材料变得非常困难。最近，通过球磨工艺和随后的热压工艺，大量地制备了几种高ZT值的纳米结构块体材料。[3]最近，胶体化学方法被用来合成大量尺寸均匀的纳米晶体。
Highly efficient thermoelectric materials have attracted tremendous attention because of various technological applications such as power generation from waste heat and environmentally friendly refrigeration.[1] The efficiency of thermoelectric materials is generally evaluated in terms of thermoelectric figure of merit ZT=(σS2/k) T, where s is the electrical conductivity, S is the Seebeck coefficient, k is the thermal conductivity, and T is the absolute temperature. Recently, various nanostructured thermoelectric materials have been reported to exhibit high ZT values. This increase in thermoelectric efficiency was attributed to the decrease of thermal conductivity caused by the increased interfaces to scatter phonons or the enhancement of power factor (σS2) by quantum confinement effects.[2] However, most of the high-ZT nanostructured materials were prepared by costly and complicated processes, making it very difficult to inexpensively synthesize a large quantity of nanostructured materials. More recently, several kinds of nanostructured bulk materials with high ZT values were fabricated in large quantity by a ball-milling process and subsequent hot-press process.[3] Recently, colloidal chemical methods have been used to synthesize large quantities of uniform-sized nanocrystals.[4]