TY - GEN
T1 - Capacitive humidity sensors based on PVA/CAB compound film with potassium acetate-enhanced sensitivity
AU - Yao, Songping
AU - Zhang, Qia
AU - Ding, Wentai
AU - Zhang, Yonghua
AU - Zhang, Jian
AU - Wang, Chaolun
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - This paper presents a capacitive humidity sensor utilizing compound sensitive film based on polyvinyl alcohol (PVA). PVA is a water-soluble polymer structuring with a lot of hydrophilic groups, so PVA film has the problem of hydrolysis due to its long-term exposure to high-humidity environment. In the novel capacitive humidity sensor, a layer of cellulose acetate butyrate (CAB) covered on PVA humidity sensitive layer acts as protective layer, and improves linearity of the sensor simultaneously. In order to improve the sensitivity of the humidity sensor, potassium acetate is mixed in PVA film. SEM images show that a number of uniform microporous structures take place in PVA film due to the introduction of potassium acetate, the humidity sensitive layer is completely covered by CAB film. The fabricated novel capacitive humidity sensors exhibit a good linear capacitive data response ($\mathrm{R}^{2}=0.8515$) with a high sensitivity of 1.41pF/%RH over a wide relative humidity range of 10%RH to 90%RH, and have good repeatability, fast response and recovery times over 25%RH to 75%RH. Combined with the excellent biodegradability of PVA and CAB, this humidity sensor has broad application prospects such as respiratory monitoring, agricultural production and so on.
AB - This paper presents a capacitive humidity sensor utilizing compound sensitive film based on polyvinyl alcohol (PVA). PVA is a water-soluble polymer structuring with a lot of hydrophilic groups, so PVA film has the problem of hydrolysis due to its long-term exposure to high-humidity environment. In the novel capacitive humidity sensor, a layer of cellulose acetate butyrate (CAB) covered on PVA humidity sensitive layer acts as protective layer, and improves linearity of the sensor simultaneously. In order to improve the sensitivity of the humidity sensor, potassium acetate is mixed in PVA film. SEM images show that a number of uniform microporous structures take place in PVA film due to the introduction of potassium acetate, the humidity sensitive layer is completely covered by CAB film. The fabricated novel capacitive humidity sensors exhibit a good linear capacitive data response ($\mathrm{R}^{2}=0.8515$) with a high sensitivity of 1.41pF/%RH over a wide relative humidity range of 10%RH to 90%RH, and have good repeatability, fast response and recovery times over 25%RH to 75%RH. Combined with the excellent biodegradability of PVA and CAB, this humidity sensor has broad application prospects such as respiratory monitoring, agricultural production and so on.
KW - PVA/CAB compound film
KW - capacitive humidity sensor
KW - flexible electronics
KW - ionic conductive
UR - https://www.scopus.com/pages/publications/85146235661
U2 - 10.1109/CISP-BMEI56279.2022.9979920
DO - 10.1109/CISP-BMEI56279.2022.9979920
M3 - 会议稿件
AN - SCOPUS:85146235661
T3 - Proceedings - 2022 15th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics, CISP-BMEI 2022
BT - Proceedings - 2022 15th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics, CISP-BMEI 2022
A2 - Chen, Xin
A2 - Cao, Lin
A2 - Li, Qingli
A2 - Wang, Yan
A2 - Wang, Lipo
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 15th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics, CISP-BMEI 2022
Y2 - 5 November 2022 through 7 November 2022
ER -
