Temperature sensing behavior of poly(3,4-ethylenedioxythiophene) thin film

Seong Hun Yu, Myong Soo Choi, Pil J. Yoo, Jong Hyeok Park, Jae Hyung Park, Jeong Ho Cho, Gi Soo Chung, Jun Young Lee

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Temperature sensing behavior of poly(3,4-ethylenedioxythiophene) (PEDOT) thin film was investigated at the temperature range of -20 C to 60 C. PEDOT thin films were fabricated by in situ polymerization, where 3,4- ethylenedioxythiophene (EDOT) and ferric p-toluene sulfonate (FTS) were used as a monomer and an oxidant, respectively. The monomer and the oxidant solutions in 1-butanol were prepared separately and mixed just before in situ polymerization. The mixed solution was cast on a substrate and polymerization was carried out at 70 C for 30 min, followed by washing with methanol and drying under vacuum. Resistance change of PEDOT film with temperature was monitored using two probe method. It was observed that resistance of PEDOT film monotonically decreased with increasing temperature, confirming a typical temperature dependence of the electrical resistance of semiconductors with negative temperature coefficient (NTC). However, resistance of PEDOT thin film was not stable with repeated heating and cooling. Resistance at the same temperature increased with repeated heating and cooling cycles. We found that stability of PEDOT thin film could be significantly improved by heat treatment of PEDOT film at 150 C for 1 h and sealing the PEDOT thin film. Temperature-dependent resistance of the stabilized PEDOT thin film could be fitted to the Steinhart-Hart equation from -20 C to 60 C range even after repeated cycles, suggesting its potential application as a flexible thin film thermistor.

Original languageEnglish
Pages (from-to)52-55
Number of pages4
JournalSynthetic Metals
Volume185-186
DOIs
Publication statusPublished - 2013 Nov 11

Fingerprint

Thin films
thin films
polymerization
Polymerization
Temperature
temperature
Oxidants
monomers
Monomers
Cooling
Negative temperature coefficient
cooling
Heating
Thermistors
cycles
heating
thermistors
Acoustic impedance
washing
sealing

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Yu, Seong Hun ; Choi, Myong Soo ; Yoo, Pil J. ; Park, Jong Hyeok ; Park, Jae Hyung ; Cho, Jeong Ho ; Chung, Gi Soo ; Lee, Jun Young. / Temperature sensing behavior of poly(3,4-ethylenedioxythiophene) thin film. In: Synthetic Metals. 2013 ; Vol. 185-186. pp. 52-55.
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abstract = "Temperature sensing behavior of poly(3,4-ethylenedioxythiophene) (PEDOT) thin film was investigated at the temperature range of -20 C to 60 C. PEDOT thin films were fabricated by in situ polymerization, where 3,4- ethylenedioxythiophene (EDOT) and ferric p-toluene sulfonate (FTS) were used as a monomer and an oxidant, respectively. The monomer and the oxidant solutions in 1-butanol were prepared separately and mixed just before in situ polymerization. The mixed solution was cast on a substrate and polymerization was carried out at 70 C for 30 min, followed by washing with methanol and drying under vacuum. Resistance change of PEDOT film with temperature was monitored using two probe method. It was observed that resistance of PEDOT film monotonically decreased with increasing temperature, confirming a typical temperature dependence of the electrical resistance of semiconductors with negative temperature coefficient (NTC). However, resistance of PEDOT thin film was not stable with repeated heating and cooling. Resistance at the same temperature increased with repeated heating and cooling cycles. We found that stability of PEDOT thin film could be significantly improved by heat treatment of PEDOT film at 150 C for 1 h and sealing the PEDOT thin film. Temperature-dependent resistance of the stabilized PEDOT thin film could be fitted to the Steinhart-Hart equation from -20 C to 60 C range even after repeated cycles, suggesting its potential application as a flexible thin film thermistor.",
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Temperature sensing behavior of poly(3,4-ethylenedioxythiophene) thin film. / Yu, Seong Hun; Choi, Myong Soo; Yoo, Pil J.; Park, Jong Hyeok; Park, Jae Hyung; Cho, Jeong Ho; Chung, Gi Soo; Lee, Jun Young.

In: Synthetic Metals, Vol. 185-186, 11.11.2013, p. 52-55.

Research output: Contribution to journalArticle

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T1 - Temperature sensing behavior of poly(3,4-ethylenedioxythiophene) thin film

AU - Yu, Seong Hun

AU - Choi, Myong Soo

AU - Yoo, Pil J.

AU - Park, Jong Hyeok

AU - Park, Jae Hyung

AU - Cho, Jeong Ho

AU - Chung, Gi Soo

AU - Lee, Jun Young

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AB - Temperature sensing behavior of poly(3,4-ethylenedioxythiophene) (PEDOT) thin film was investigated at the temperature range of -20 C to 60 C. PEDOT thin films were fabricated by in situ polymerization, where 3,4- ethylenedioxythiophene (EDOT) and ferric p-toluene sulfonate (FTS) were used as a monomer and an oxidant, respectively. The monomer and the oxidant solutions in 1-butanol were prepared separately and mixed just before in situ polymerization. The mixed solution was cast on a substrate and polymerization was carried out at 70 C for 30 min, followed by washing with methanol and drying under vacuum. Resistance change of PEDOT film with temperature was monitored using two probe method. It was observed that resistance of PEDOT film monotonically decreased with increasing temperature, confirming a typical temperature dependence of the electrical resistance of semiconductors with negative temperature coefficient (NTC). However, resistance of PEDOT thin film was not stable with repeated heating and cooling. Resistance at the same temperature increased with repeated heating and cooling cycles. We found that stability of PEDOT thin film could be significantly improved by heat treatment of PEDOT film at 150 C for 1 h and sealing the PEDOT thin film. Temperature-dependent resistance of the stabilized PEDOT thin film could be fitted to the Steinhart-Hart equation from -20 C to 60 C range even after repeated cycles, suggesting its potential application as a flexible thin film thermistor.

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