Polaron Delocalization Dependence of the Conductivity and the Seebeck Coefficient in Doped Conjugated Polymers was written by DexterTam, Teck Lip;Moudgil, Akshay;Teh, Wei Jie;Wong, Zicong Marvin;Handoko, Albertus Denny;Chien, Sheau Wei;Yang, Shuo-Wang;Yeo, Boon Siang;Leong, Wei Lin;Xu, Jianwei. And the article was included in Journal of Physical Chemistry B in 2022.Recommanded Product: 128-08-5 This article mentions the following:
Conjugated polymers are promising materials for thermoelecs. as they offer good performances at near ambient temperatures The current focus on polymer thermoelec. research mainly targets a higher power factor (PF; a product of the conductivity and square of the Seebeck coefficient) through improving the charge mobility. This is usually accomplished via structural modification in conjugated polymers using different processing techniques and doping. As a result, the structure-charge transport relationship in conjugated polymers is generally well-established. In contrast, the relationship between the structure and the Seebeck coefficient is poorly understood due to its complex nature. A theor. framework by David Emin (Phys. Rev. B, 1999,59, 6205-6210) suggests that the Seebeck coefficient can be enhanced via carrier-induced vibrational softening, whose magnitude is governed by the size of the polaron. In this work, we seek to unravel this relationship in conjugated polymers using a series of highly identical pro-quinoid polymers. These polymers are ideal to test Emin′s framework exptl. as the quinoid character and polaron delocalization in these polymers can be well controlled even by small at. differences (<10 at. % per repeating unit). By increasing the polaron delocalization, i.e., the polaron size, we demonstrate that both the conductivity and the Seebeck coefficient (and hence PF) can be increased simultaneously, and the latter is due to the increase in the polaron′s vibrational entropy. By using literature data, we also show that this phenomenon can be observed in two closely related diketopyrrolopyrrole-conjugated polymers as well as in p-doped P3HT and PANI systems with an increasing mol. order. In the experiment, the researchers used many compounds, for example, 1-Bromopyrrolidine-2,5-dione (cas: 128-08-5Recommanded Product: 128-08-5).
1-Bromopyrrolidine-2,5-dione (cas: 128-08-5) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. alpha-Bromoesters are employed in the Reformatsky reaction for the synthesis of beta-hydroxyesters. Many of the alkyl bromine derivatives are excellent alkylating agents since bromides are good leaving groups. Tribromides, like tetrabutylammonium tribromide, are used as a solid source of bromine. N-bromosuccimide (NBS) is used for the selective bromination of allylic bonds.Recommanded Product: 128-08-5
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary