A real-time humidity sensor based on a microwave oscillator with conducting polymer PEDOT:PSS film

Tae Gyu Kang, Jin Kwan Park, Gi Ho Yun, Hyang Hee Choi, Hee Jo Lee, Jong Gwan Yook

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In this paper, we propose a humidity sensor based on a negative resistance oscillator using conducting polymer (CP) PEDOT:PSS film at room temperature. The proposed humidity sensor basically consists of a microstrip line and a negative resistance circuit, which creates a negative resistance for high-frequency oscillation. The microstrip line has a circuit structure that is connected through a via hole between the ground plane and the signal line with a CP thin film. From our experimental results, we find that the oscillation frequency of the sensor gradually decreases as the relative humidity (RH) increases. Owing to the conductivity variation of the CP film with the RH value, the oscillation frequency of the sensor sensitively changes in real time. Therefore, we suggest that our microwave-oscillator-based sensor scheme is a good candidate for the design of a robust and stable humidity sensor.

Original languageEnglish
Pages (from-to)145-151
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume282
DOIs
Publication statusPublished - 2019 Mar 1

Fingerprint

Microwave oscillators
microwave oscillators
Negative resistance
Humidity sensors
Conducting polymers
conducting polymers
humidity
Microstrip lines
Polymer films
sensors
Atmospheric humidity
Sensors
Networks (circuits)
oscillations
negative resistance circuits
Thin films
poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)
oscillators
conductivity
Temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

Kang, Tae Gyu ; Park, Jin Kwan ; Yun, Gi Ho ; Choi, Hyang Hee ; Lee, Hee Jo ; Yook, Jong Gwan. / A real-time humidity sensor based on a microwave oscillator with conducting polymer PEDOT:PSS film. In: Sensors and Actuators, B: Chemical. 2019 ; Vol. 282. pp. 145-151.
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abstract = "In this paper, we propose a humidity sensor based on a negative resistance oscillator using conducting polymer (CP) PEDOT:PSS film at room temperature. The proposed humidity sensor basically consists of a microstrip line and a negative resistance circuit, which creates a negative resistance for high-frequency oscillation. The microstrip line has a circuit structure that is connected through a via hole between the ground plane and the signal line with a CP thin film. From our experimental results, we find that the oscillation frequency of the sensor gradually decreases as the relative humidity (RH) increases. Owing to the conductivity variation of the CP film with the RH value, the oscillation frequency of the sensor sensitively changes in real time. Therefore, we suggest that our microwave-oscillator-based sensor scheme is a good candidate for the design of a robust and stable humidity sensor.",
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A real-time humidity sensor based on a microwave oscillator with conducting polymer PEDOT:PSS film. / Kang, Tae Gyu; Park, Jin Kwan; Yun, Gi Ho; Choi, Hyang Hee; Lee, Hee Jo; Yook, Jong Gwan.

In: Sensors and Actuators, B: Chemical, Vol. 282, 01.03.2019, p. 145-151.

Research output: Contribution to journalArticle

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