Effects of Long-term Exposure of High and Low Humidity on Thin-film Humidity Sensors
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
The effects of long-term exposure of high and low humidity on thin-film humidity sensors are investigated. Five com- mercially available thin-film humidity sensors are initially calibrated in a humidity chamber as a reference before long- term exposure to high and low humidity. Then, the sensors are kept in a high-humidity environment (~95 %rh) for four months. After the exposure, the sensors are calibrated in the same manner as the initial calibration. Consequently, the device reading values from the humidity sensors are elevated up to about 5 %rh. Interestingly, the degree of elevation by the high-humidity exposure shows a negative correlation with the price of the humidity sensors. Humidity sensors are then kept in a low-humidity environment (~10 %rh) for another four months. After the exposure, a calibration similar to the initial calibration is performed. As a result, the device reading from humidity sensors is decreased, indicating a recovery from the effect of high-humidity exposure. The durability test conducted in this study provides experimental evidence for the use of thin-film humidity sensors in high-humidity environments such as greenhouses and food factories for a long period of time.
Abstract
The effects of long-term exposure of high and low humidity on thin-film humidity sensors are investigated. Five com- mercially available thin-film humidity sensors are initially calibrated in a humidity chamber as a reference before long- term exposure to high and low humidity. Then, the sensors are kept in a high-humidity environment (~95 %rh) for four months. After the exposure, the sensors are calibrated in the same manner as the initial calibration. Consequently, the device reading values from the humidity sensors are elevated up to about 5 %rh. Interestingly, the degree of elevation by the high-humidity exposure shows a negative correlation with the price of the humidity sensors. Humidity sensors are then kept in a low-humidity environment (~10 %rh) for another four months. After the exposure, a calibration similar to the initial calibration is performed. As a result, the device reading from humidity sensors is decreased, indicating a recovery from the effect of high-humidity exposure. The durability test conducted in this study provides experimental evidence for the use of thin-film humidity sensors in high-humidity environments such as greenhouses and food factories for a long period of time.
참고문헌 (12)
- M. A. Najeeb, "Organic thin-film capacitive and resistive humidity sensors: A focus review", Adv. Mater. Interfaces[DOI]
- H. Farahani, "Humidity sensors principle, mechanism, and fabrication technologies:A comprehensive review", Sensors, 14(5), pp.7881~7939 (2014)
- Z. Chen, "Humidity sensors: A review of materials and mechanisms", Sens. Lett, 3(4), pp.274~295 (2005)
- Y. Sakai, "Humidity sensors based on polymer thin films", Sens. Actuators B Chem, 35(1-3), pp.85~90 (1996)
- W. -P. Chen, "A capacitive humidity sensor based on multi-wall carbon nanotubes (MWCNTs)", Sensors, 9(9), pp.7431~7444 (2009)
- H. Bi, "Ultrahigh humidity sensitivity of graphene oxide", Sci. Rep, 3, pp.2714(1)~2714(7) (2013)
- S. Borini, "Ultrafast graphene oxide humidity sensors", ACS Nano, 7(12), pp.11166~11173 (2013)
- S. -W. Lee, "Sorption", desorption hysteresis of thin-film humidity sensors based on graphene oxide and its derivative, 2016, pp.237, 575~580
- E. U. Park, "Correlation between the sensitivity and the hysteresis of humidity sensors based on graphene oxides", Sens. Actuators B Chem, 258, pp.255~262 (2018)
- B. I. Choi, "Evaluation of radiosonde humidity sensors at low temperature using ultralow-temperature humidity chamber", Adv. Sci. Res, 15, pp.207~212 (2018)
- K. E. Secrist, "Humidity swelling", deswelling hysteresis in a polyelectrolyte multilayer film, 2011, pp.44(8), 2859~2865
- S. -W. Lee, "Integrated study of water sorption", desorption behavior of weak polyelectrolyte layer-by-layer films, 2013, pp.46(7), 2793~2799