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

doi:10.1016/j.snb.2018.09.080

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

Department of Electrical and Electronic Engineering

Research output: Contribution to journal › Article › peer-review

26 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 language	English
Pages (from-to)	145-151
Number of pages	7
Journal	Sensors and Actuators, B: Chemical
Volume	282
DOIs	https://doi.org/10.1016/j.snb.2018.09.080
Publication status	Published - 2019 Mar 1

Bibliographical note

Funding Information:
This research was supported by the MSIP (Ministry of Science, ICT and Future Planning), Korea, under the ITRC (Information Technology Research Center) support programme ( IITP-2017-2013-0-00680 ) supervised by the IITP (Institute for Information & Communications Technology Promotion). This research was also supported by the Basic Science Research Program through the National Research Foundation (NRF) of Korea funded by the Ministry of Science, ICT & Future Planning ( NRF-2015R1C1A1A02037804 ) and by the Mid-career Researcher Program through the NRF of South Korea under funding for Science and Engineering ( NRF-2017R1A2B4012051 ).

Publisher Copyright:
© 2018 Elsevier B.V.

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

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10.1016/j.snb.2018.09.080

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

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.",

author = "Kang, {Tae Gyu} and Park, {Jin Kwan} and Yun, {Gi Ho} and Choi, {Hyang Hee} and Lee, {Hee Jo} and Yook, {Jong Gwan}",

note = "Funding Information: This research was supported by the MSIP (Ministry of Science, ICT and Future Planning), Korea, under the ITRC (Information Technology Research Center) support programme ( IITP-2017-2013-0-00680 ) supervised by the IITP (Institute for Information & Communications Technology Promotion). This research was also supported by the Basic Science Research Program through the National Research Foundation (NRF) of Korea funded by the Ministry of Science, ICT & Future Planning ( NRF-2015R1C1A1A02037804 ) and by the Mid-career Researcher Program through the NRF of South Korea under funding for Science and Engineering ( NRF-2017R1A2B4012051 ). Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

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AU - Lee, Hee Jo

AU - Yook, Jong Gwan

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Y1 - 2019/3/1

N2 - 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.

AB - 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

Abstract

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