期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 102, 期 1, 页码 97-101出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2003.12.061
关键词
cross-linked structure; electrical capacitance; humidity sensor; long-term stability
A capacitive-type humidity sensor based on a poly(methyl methacrylate) (PMMA) cross-linked with divinylbenzene (DVB) was fabricated. We examined the influence of introducing a cross-linked structure in the sensing polymer on the long-term stability of the sensor in a hot and humid atmosphere. As the DVB content increased, the irreversible increase in the water sorption ability of the cross-linked PMMA by long-term aging in a 40degreesC and 90% RH atmosphere was depressed. This was because the irreversible increase in volume of the sensing polymer caused by swelling in such atmosphere was prevented due to the rigid cross-linked structure. The depression of the drift of the water sorption ability resulted in the depression of the drift of the sensor capacitance. (C) 2004 Elsevier B.V. All rights reserved.
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