• Title/Summary/Keyword: polythiophene derivatives

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Synthesis of Electroactive Polythiophene Derivatives and Its Application for Biointerface (I) (전기적 활성을 갖는 폴리티오펜 유도체들의 합성과 생체계면에의 응용 (I))

  • 정선형;배진영;김지흥;정동준
    • Polymer(Korea)
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    • v.26 no.1
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    • pp.28-36
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    • 2002
  • In this study, we synthesized novel thiophene derivatives by the protection of the carboxyl group of 3-thiophene acetic acid with differently substituted benzyl groups. While 3-thiophene acetic acid is not electro-polymerizable, the modified monomers can be easily electro-oxidized to form stable electroactive polymers. The protecting groups can be easily removed in the solid state and the desired reactive carboxyl group can be introduced on the polymer surface. SEM observations show that obtained polymer films show a very good film surface and homogeneous morphology on the Pt electrode. After introduction of macromonomer, FT-IR spectrum shows new absorption bands at 1650 and $1550 cm^{-1}$, which is consistent with the formation of an amide bond. Electroactivity measurements were examined by cyclic voltammogram(CV). These polymers showed the characteristic electrochemical behavior of poly(3-alkylthiophene)s with reversible redox transition in the range of 0.7-0.9 V.

Functional Polythiophene Bearing Hydroxyethyl Groups and Their Derivatives

  • Kim Hyun-Chul;Kim Jong-Seong;Baek Sung-Sik;Ree Moon-Hor
    • Macromolecular Research
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    • v.14 no.2
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    • pp.173-178
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    • 2006
  • Poly(3-(2-hydroxyethyl)thiophene) (P3HET) was synthesized using oxidative coupling polymerization that involved the protecting and deprotecting of hydroxyl groups but not the chlorine substitution or oxidative decomposition of the hydroxyl groups. The resulting P3HET exhibited good solubility in aprotic solvents, in contrast to the insoluble polymer product synthesized directly from the monomer, 3-(2-hydroxyethyl)thiophene (3HET). P3HET had low conductivity due to the strong hydrogen bonding of its hydroxyl groups. The ester-functionalized poly(3-(2-acetoxyethyl)thiophene) and poly(3-(4-pentylbenzoateethyl)thiophene) were also prepared with reasonably high molecular weights in order to examine how this functionalization modified the physical and chemical properties of P3HET. These polymers exhibited better solubility in common solvents and higher conductivity than P3HET. All these polymers exhibited bathochromic shifts of their film state absorption maxima with respect to those found in the UV-visible spectra of their solution phases. The extent of the bathochromic shift was found to vary with the lengths of the side chains of the ester-functionalized polymers.

Physical effect of annealing conditions on soluble organic semiconductor for organic thin film transistors

  • Kim, Dong-Woo;Kim, Doo-Hyun;Kim, Keon-Soo;Kim, Hyung-Jin;Lee, Dong-Hyuck;Hong, Mun-Pyo
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.268-269
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    • 2008
  • We have examined the effect of physical drying and annealing conditions for the soluble derivatives of polythiophene as p-type channel materials of organic thin film transistors (OTFTs) in our special designed drying system; performances of the jetting-processed OTFTs can be improved more than 10 times just by optimizing the physical conditions of drying and annealing.

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Fabrication of soluble organic thin film transistor with ammonia ($NH_3$) plasma treatment

  • Kim, Dong-Woo;Kim, Doo-Hyun;Kim, Keon-Soo;Kim, Hyoung-Jin;Choi, Hong;Lee, Dong-Hyeok;Hong, Mun-Pyo
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.566-567
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    • 2009
  • We have examined the silicon nitride ($SiN_x$) as gate insulator with the ammonia ($NH_3$) plamsa treatment for the soluble derivatives of polythiophene as p-type channel materials of organic thin film transistors (OTFTs). Fabrications of the jetting-processed OTFTs with $SiN_x$ as gate insulator by $NH_3$ plasma treatment can be similar to performance of OTFTs with silicon dioxide ($SiO_2$) insulator.

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