24小时热门版块排行榜

返回列表

【奖励】本帖被评价45次，作者穿越千年增加金币 34 个

当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖

穿越千年

版主 (著名写手)

[资源] 有机物热电材料

由于热电材料版块刚刚成立，需要活跃气氛，调动大家积极讨论，所以我在有空的时候尽量给大家提供一些资源，并且就这些文章提出一些问题供大家讨论。

这三篇文章分别发表在：Nature materials、Nanotechnology、Materials letters
都是关于有机物热电材料的文章。

传统的热电材料都是无机物热电材料，包括BiTe、 PbTe、SiGe合金及其固溶体，具有cage-like结构的Skutterudite和clathrate填充化合物，钴酸钙类的氧化物，β-Zn4Sb3、FeSi2、硼化物、HMS（高Mn硅化物）等等（不一一列举，欢迎大家补充）。都属于无机物热电材料。但是这些材料的组成元素大部分在地壳中的含量并不丰富，价格非常昂贵，有些元素也含有毒性（Pb、As等），此外这些材料的机械性能普遍较差，所以国内外一些课题组将视线转移到了有机物热电材料。
相比于无机物热电材料，有机物热电材料具有资源丰富、低成本、质量轻、高韧性高弹性、低热导率等优点；但是目前有机物热电材料基本都是采用有机物和传统无机物热电材料（e.g. Bi2Te3）相互掺杂的方法，其热电优值普遍较低。主要原因在于载流子浓度太低，导致电导率很低，我想这也是这一类材料重点突破的方向。（由于我也不是从事有机热电材料这一块的，只能大概的说说，大家有兴趣可以一起讨论）

下面我分别给出这三篇文章的摘要，方便大家根据自己的兴趣和需要下载：
Nature Materials：
Signiﬁcant improvements to the thermoelectric ﬁgure of merit
ZT have emerged in recent years, primarily due to the en-
gineering of material composition and nanostructure in inor-
ganic semiconductors1
(ISCs). However, many present high-ZT
materials are based on low-abundance elements that pose
challenges for scale-up, as they entail high material costs in
addition to brittleness and difﬁculty in large-area deposition.
Here we demonstrate a strategy to improve ZT in conductive
polymers and other organic semiconductors (OSCs) for which
the base elements are earth-abundant. By minimizing total
dopant volume, we show that all three parameters constituting
ZT vary in a manner so that ZT increases; this stands in sharp
contrast to ISCs, for which these parameters have trade-offs.
Reducing dopant volume is found to be as important as optimiz-
ing carrier concentration when maximizing ZT in OSCs. Imple-
menting this strategywith the dopant poly(styrenesulphonate)
in poly(3,4-ethylenedioxythiophene), we achieve ZT = 0.42
at room temperature.

nanotechnology：
Abstract
Bismuth telluride (Bi2Te3) nanorods and polyaniline (PANI) nanoparticles have been
synthesized by employing solvothermal and chemical oxidative processes, respectively.
Nanocomposites, comprising structurally ordered PANI preferentially grown along the surface
of a Bi2Te3 nanorods template, are synthesized using in situ polymerization. X-ray powder
diffraction, UV–vis and Raman spectral analysis conﬁrm the highly ordered chain structure of
PANI on Bi2Te3 nanorods, leading to a higher extent of doping, higher chain mobility and
enhancement of the thermoelectric performance. Above 380 K, the PANI–Bi2Te3
nanocomposite with a core–shell/cable-like structure exhibits a higher thermoelectric power
factor than either pure PANI or Bi2Te3. At room temperature the thermal conductivity of the
composite is lower than that of its pure constituents, due to selective phonon scattering by the
nanointerfaces designed in the PANI–Bi2Te3 nanocable structures. The ﬁgure of merit of the
nanocomposite at room temperature is comparable to the values reported in the literature for
bulk polymer-based composite thermoelectric materials.

Materials letters：
A segregated polymer composite based on ultrahigh molecular weight polyethylene (UHMWPE), carbon
nanotube (CNT) and p type bismuth telluride (Bi2Te3) was fabricated. Morphology observation conﬁrmed
the formation of a typical segregated conductive network of CNT/Bi2Te3 hybrids, in which the CNTs/
Bi2Te3 hybrid ﬁllers were only located at the interfaces of UHMWPE domains to form continuous
conducting pathways. The segregated composite containing 2.6 vol% CNTs and 5.1 vol% Bi2Te3 exhibited
an electrical conductivity of 45 S/m, thermal conductivity of 0.43W/mK, Seebeck coefﬁcient of 29 μV/K,
and thermoelectric ﬁgure of merit ZT¼310−5
at room temperature. This work implies that the
formation of a segregated structure in polymer composites demonstrates a new strategy to develop
polymer-based thermoelectric materials.

回复此楼

» 本帖附件资源列表

欢迎监督和反馈：小木虫仅提供交流平台，不对该内容负责。
本内容由用户自主发布，如果其内容涉及到知识产权问题，其责任在于用户本人，如对版权有异议，请联系邮箱：xiaomuchong@tal.com
附件 1 : Engineered_doping_of_organic_semiconductors_for_enhanced_theromoelectric_efficiency.pdf

2013-06-20 16:00:08, 454.48 K

附件 2 : Synthesis,characterization_and_enhanced_thermoelectric_performance_of_structurally_ordered_cable-like_novel_polyaniline-bismuth_telluride_nanocomposite.pdf

2013-06-20 16:00:32, 1.29 M

附件 3 : Thermoelectric_behaviour_of_segregated_conductive_polymer_composites_composites_composites_with_hybrid_fillers_of_carbon_nanotube_and_bismuth_telluride.pdf

2013-06-20 16:00:57, 2.85 M

» 收录本帖的淘帖专辑推荐

纳米技术与能源及模拟	新能源	电化学、材料模拟、金属材料及各大材料	化学科研精华
热电相关	热电材料	热电材料	材料合成001淘帖