Ex-situ PTH/PEDOT Kompozitlerinin Termoelektrik Özellikleri

Bir termoelektrik malzeme, sıcaklık farkını elektriksel potansiyel farkına dönüştürebilir. Günümüzde termoelektrik malzeme olarak kullanılan sert, şekillendirilmesi zor, pahalı ve toksik yarı iletken metaller yerine esnek, toksik olmayan ve ucuz iletken polimerlerin kullanılması için yoğun araştırmalar yapılmaktadır. Bu amaçla araştırılan iletken polimerler arasında poli(3,4-etilendioksitiyofen) (PEDOT) en umut verici olanıdır. Ancak termoelektrik özellikleri tek başına yeterli değildir. Termoelektrik özellikler inorganik, organik veya polimerik yapılardaki nanopartikülleri iletken polimerlere ekleyerek artırılabilir. Bu çalışmada ilk olarak PTh, poli(sülfonik asit difenil anilin) varlığında, manyetik alanlı ve manyetik alansız sulu ortamda oksidatif polimerizasyon ile sentezlendi. İkinci olarak, PEDOT, oksidatif polimerizasyon yoluyla, manyetik alanlı ve manyetik alansız sulu ortamda sentezlendi. Daha sonra, farklı PTh/PEDOT oranları ile ex-situ PTH/PEDOT kompozitleri elde edildi. Polimerlerin partikül büyüklükleri ölçülmüş ve FTIR ve UV-vis. spektrumları alındı. Polimerlerin ince filmlerinden Seebeck katsayısı ve elektriksel iletkenlik ölçüldü. Güç faktörü değerleri hesaplandı. PTh ve ex-situ PTH/PEDOT kompozitlerinin Seebeck katsayılarının manyetik alanla arttığı bulundu. PEDOT'ların en yüksek Seebeck katsayısı ve güç faktörü sırasıyla, 1683,3 µV/K ve 98,2 µW/mK2 olarak manyetik alan olmadan sentezlenen PEDOT'tan elde edildi. Ex-situ PTh/PEDOT kompozitlerin en yüksek Seebeck katsayısı ve güç faktörü sırasıyla, 400 µV/K ve 0.1 µW/mK2 olarak manyetik alanla sentezlenen (PTh/PEDOT3)m’den elde edildi.

Thermoelectric Properties of ex-situ PTH/PEDOT Composites

A thermoelectric material can convert temperature difference into electrical potential difference. Today, intensive researches are being carried out in order to use flexible, non-toxic and inexpensive conductive polymers instead of hard, hard-to-shape, expensive and toxic semiconductor metals used as thermoelectric materials. Among the conductive polymers investigated for this purpose, poly(3,4-ethylenedioxythiophene) (PEDOT) is the most promising. However, its thermoelectric properties alone are not sufficient. Thermoelectric properties can be increased by incorporating nanoparticles in inorganic, organic or polymeric structures into conductive polymers. In this study firstly, PTh was synthesized with and without magnetic field by oxidative polymerization in aqueous media in the presence of poly(sulfonic acid diphenyl aniline). Secondly, PEDOT was synthesized with and without magnetic field in aqueous media by oxidative polymerization. Then, ex-situ PTH/PEDOT composites were obtained with different ratios of PTh/PEDOT. Particle sizes of polymers were measured and their FTIR and UV-vis. spectra were taken. Seebeck coefficient and electrical conductivity were measured from thin films of polymers. Power factor values were calculated. It was found that the Seebeck coefficients of PTh and ex-situ PTH/PEDOT composites increased with magnetic field. The highest Seebeck coefficient and power factor of PEDOTs were obtained from PEDOT synthesized without magnetic field as 1683.3 µV/K and 98.2 µW/mK2, respectively. The highest Seebeck coefficient and power factor of ex-situ PTh/PEDOT composites were obtained from (PTh/PEDOT3)m synthesized with magnetic field as 400 µV/K and 0.1 µW/mK2, respectively.

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