由于熱電材料版塊剛剛成立，需要活躍氣氛，調(diào)動(dòng)大家積極討論，所以我在有空的時(shí)候盡量給大家提供一些資源，并且就這些文章提出一些問題供大家討論。

這三篇文章分別發(fā)表在：Nature materials、Nanotechnology、Materials letters
都是關(guān)于有機(jī)物熱電材料的文章。

傳統(tǒng)的熱電材料都是無機(jī)物熱電材料，包括BiTe、 PbTe、SiGe合金及其固溶體，具有cage-like結(jié)構(gòu)的Skutterudite和clathrate填充化合物，鈷酸鈣類的氧化物，β-Zn4Sb3、FeSi2、硼化物、HMS（高M(jìn)n硅化物）等等（不一一列舉，歡迎大家補(bǔ)充）。都屬于無機(jī)物熱電材料。但是這些材料的組成元素大部分在地殼中的含量并不豐富，價(jià)格非常昂貴，有些元素也含有毒性（Pb、As等），此外這些材料的機(jī)械性能普遍較差，所以國內(nèi)外一些課題組將視線轉(zhuǎn)移到了有機(jī)物熱電材料。
相比于無機(jī)物熱電材料，有機(jī)物熱電材料具有資源豐富、低成本、質(zhì)量輕、高韌性高彈性、低熱導(dǎo)率等優(yōu)點(diǎn)；但是目前有機(jī)物熱電材料基本都是采用有機(jī)物和傳統(tǒng)無機(jī)物熱電材料（e.g. Bi2Te3）相互摻雜的方法，其熱電優(yōu)值普遍較低。主要原因在于載流子濃度太低，導(dǎo)致電導(dǎo)率很低，我想這也是這一類材料重點(diǎn)突破的方向。（由于我也不是從事有機(jī)熱電材料這一塊的，只能大概的說說，大家有興趣可以一起討論）

下面我分別給出這三篇文章的摘要，方便大家根據(jù)自己的興趣和需要下載：
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.

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