Identification of a positive-Seebeck-coefficient exohedral fullerene.

Identification of a positive-Seebeck-coefficient exohedral fullerene.
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正塞贝克系数外面富勒烯的鉴定。

DOI:
10.1039/c6nr02291j
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发表时间:
2016
期刊:
影响因子:
6.7
通讯作者:
Almutlaq N
Almutlaq N
中科院分区:
材料科学2区
文献类型:
--
作者:
Almutlaq N

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如果基于富勒烯的热电要成为一种可行的技术,那么同时具有正负塞贝克系数的富勒烯是必要的。已知C60具有负的Seebeck系数,因此在本文中,我们解决了识别正的Seebeck系数的富勒烯的挑战。我们研究了外面体富勒烯C50Cl10与金电极连接的单分子结的热电性质,发现它确实具有正的Seebeck系数。此外,与C60一样,塞贝克系数可以通过串联放置一个以上的C50Cl10来增加。对于单个C50Cl10,我们发现S=+8μV K−1,对于两个串联的C50Cl10‘S,我们得到S=+30μV K−1。我们还发现,C50Cl10单体和二聚体的功率因数分别为0.5×10−5 W m−1 K−2和6.0×10−5 W m−1 K−2。这些结果表明,外面体富勒烯提供了一类具有理想性能的新型热电材料,补充了全碳富勒烯的热电材料,从而能够在全碳富勒烯串联结构中提高温度电压。
If fullerene-based thermoelectricity is to become a viable technology, then fullerenes exhibiting both positive and negative Seebeck coefficients are needed. C60 is known to have a negative Seebeck coefficient and therefore in this paper we address the challenge of identifying a positive-Seebeck-coefficient fullerene. We investigated the thermoelectric properties of single-molecule junctions of the exohedral fullerene C50Cl10 connected to gold electrodes and found that it indeed possesses a positive Seebeck coefficient. Furthermore, in common with C60, the Seebeck coefficient can be increased by placing more than one C50Cl10 in series. For a single C50Cl10, we find S = +8 μV K−1 and for two C50Cl10's in series we find S = +30 μV K−1. We also find that the C50Cl10 monomer and dimer have power factors of 0.5 × 10−5 W m−1 K−2 and 6.0 × 10−5 W m−1 K−2 respectively. These results demonstrate that exohedral fullerenes provide a new class of thermoelectric materials with desirable properties, which complement those of all-carbon fullerenes, thereby enabling the boosting of the thermovoltage in all-fullerene tandem structures.
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