Measurement of Thermoelectric Properties of Phenylacetylene-Capped Silicon Nanoparticles and Their Potential in Fabrication of Thermoelectric Materials
Measurement of Thermoelectric Properties of Phenylacetylene-Capped Silicon Nanoparticles and Their Potential in Fabrication of Thermoelectric Materials
复制标题
苯乙炔封端硅纳米颗粒热电性能的测量及其在热电材料制造中的潜力
DOI：
10.1007/s11664-012-2297-x
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发表时间：
2012
影响因子：
2.1
通讯作者：
Ashby S
中科院分区：
文献类型：
--
作者：
Ashby S
硅是一种非常有吸引力的材料，用于制造热电材料。纳米结构的硅材料，如硅纳米线（SiNW），显示出巨大的潜力，因为它们显示出低的热导率，由于有效的声子散射，但类似的电导率体硅。硅纳米颗粒（SiNP）更容易合成，并且显示出更多的表面缺陷，这表明可以实现更有效的声子散射，但这些材料也显示出低电导率，这是由于材料内部的缺陷，除非在高温下压制（1100°C）。共轭覆盖层显示出桥接这些缺陷的潜力，从而在不需要该工艺的情况下提供更高的导电性。通过胶束还原法合成苯乙炔封端的SiNP并压制成颗粒。测量的电导率，塞贝克系数，和热导率。结果表明，由这些颗粒生产的材料显示出相对较高的塞贝克系数（3228.84μV K−1），这将对品质因数（ZT）产生积极影响。可观的电导率（18.1 S m-1）和低热导率（0.1 W m-1 K-1）证实了使用共轭分子作为由SiNP制造的块体材料中的纳米颗粒之间的交联方式的潜力。这些结果给出了0.57的品质因数，这与更好地建立的热电材料相当。
Silicon is a highly attractive material for the fabrication of thermoelectric materials. Nanostructured silicon materials, such as silicon nanowires (SiNWs), show great potential as they show low thermal conductivities due to efficient phonon scattering but similar electrical conductivities to bulk silicon. Silicon nanoparticles (SiNPs) are easier to synthesize and show a greater number of surface defects, which suggests that more efficient phonon scattering can be achieved, but these materials also show low electrical conductivity due to defects within the materials unless pressed at high temperatures (1100°C). Conjugated capping layers show the potential to bridge these defects, giving higher conductivity without the need for this process. Phenylacetylene-capped SiNPs are synthesized via the micelle reduction method and pressed into a pellet. Measurements of the electrical conductivity, Seebeck coefficient, and thermal conductivity were taken. The results show that the material produced from these particles shows a relatively high Seebeck coefficient (3228.84μV K−1) which would have a positive effect on the figure of merit (ZT). A respectable electrical conductivity (18.1 S m−1) and a low thermal conductivity (0.1 W m−1K−1) confirm the potential of using conjugated molecules as a way of cross-linking between nanoparticles in a bulk material fabricated from SiNPs. These results give a figure of merit of 0.57, which is comparable to better established thermoelectric materials.
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DOI：
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发表时间：
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