期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 282, 期 -, 页码 145-151出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.09.080
关键词
PEDOT:PSS; Microwave; Oscillating circuit; Conducting polymer; Real-time humidity sensing
资金
- MSIP (Ministry of Science, ICT and Future Planning), Korea, under the ITRC (Information Technology Research Center) support programme [IITP-2017-2013-0-00680]
- Basic Science Research Program through the National Research Foundation (NRF) of Korea - Ministry of Science, ICT & Future Planning [NRF-2015R1C1A1A02037804]
- NRF of South Korea [NRF-2017R1A2B4012051]
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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