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J. Am. Chem. Soc._Side-Chain Effects on the Conductivity, Morphology, and Thermoelectric Properties of Self-Doped Narrow-Band-Gap Conjugated Polyelectrolytes

2014-9-19 13:09| 发布者: Mcdull| 查看: 2314| 评论: 0|原作者: maxsun|来自: 捷报频传

摘要: 个人感触是对于一个新的领域,要想得到别人的认可是很难的。特别是新材料,如果效率超不过现有材料就更难了。和别人合作的时候,可以看出物理和工程的人想问题的角度跟化学人完全不一样,挺有意思的。
Title: Side-Chain Effects on the Conductivity, Morphology, and Thermoelectric Properties of Self-Doped Narrow-Band-Gap Conjugated Polyelectrolytes

Authors: Cheng-Kang Mai †#∇, Ruth A. Schlitz §#, Gregory M. Su §#, Daniel Spitzer †∇, Xiaojia Wang ⊥, Stephanie L. Fronk †∇, David G. Cahill ⊥, Michael L. Chabinyc *§#, and Guillermo C. Bazan *†§#∇

Affiliations: †Department of Chemistry and Biochemistry, §Materials Department, #Materials Research Laboratory, and ∇Center for Polymers and Organic Solids, University of California, Santa Barbara, California 93106, United States
⊥ Department of Materials Science and Engineering, and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, United States

DOI: 10.1021/ja504284r

Publication Date (Web): September 2, 2014
ja-2014-04284r_0005.gif
Abstract: This contribution reports a series of anionic narrow-band-gap self-doped conjugated polyelectrolytes (CPEs) with π-conjugated cyclopenta-[2,1-b;3,4-b′]-dithiophene-alt-4,7-(2,1,3-benzothiadiazole) backbones, but with different counterions (Na+, K+, vs tetrabutylammonium) and lengths of alkyl chains (C4 vs C3). These materials were doped to provide air-stable, water-soluble conductive materials. Solid-state electrical conductivity, thermopower, and thermal conductivity were measured and compared. CPEs with smaller counterions and shorter side chains exhibit higher doping levels and form more ordered films. The smallest countercation (Na+) provides thin films with higher electrical conductivity, but a comparable thermopower, compared to those with larger counterions, thereby leading to a higher power factor. Chemical modifications of the pendant side chains do not influence out of plane thermal conductivity. These studies introduce a novel approach to understand thermoelectric performance by structural modifications.


Link: http://pubs.acs.org/doi/abs/10.1021/ja504284r

Remarks:

有机热电是一个新兴的有机电子分支,现在文章发的不是很多。大家都在玩PEDOT, 效率已经能做到挺高的。这篇文章,我做了一组新的导电材料,之前和别人合作测测热电性质,但是两年了一点消息都没有,等得都不耐烦了。不过我运气比较好,自己找了Heeger组的博后合作,先用在了有机太阳能电池上了。后来chabinyc组让我去他们组自己测,然后我就玩了一下合成人都喜欢玩的structure-property relationship。

四月底送审,第一次两个审稿人都是大修改,但是感觉没有什么大意见。我就再补了一个材料。第二次找了另外两个审稿人,两个还是大修改,但是还没有什么大问题,就说我们应该多讨论一下seebeck系数。但是对于这种self-doped材料来说,没有一个很好的物理模型可以用来解释导电率和Seebeck的变化。感觉好像审稿人的背景和我们差很多,问的问题的角度真的和我们想的差别很大。我们回答完这些问题就直接接收了。历史整整四个月!

个人感触是对于一个新的领域,要想得到别人的认可是很难的。特别是新材料,如果效率超不过现有材料就更难了。和别人合作的时候,可以看出物理和工程的人想问题的角度跟化学人完全不一样,挺有意思的。

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