Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 181, Issue -, Pages 795-801Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.02.038
Keywords
Humidity sensor; Quartz crystal microbalance; Functionalized calix[4]arenes; Sensitivity and linearity; Adsorption dynamic analysis
Funding
- National Science Council of Taiwan [NSC 100-2113-M-034-001-MY3]
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Humidity sensors were made by coating 25,26,27-tribenzoyloxy-28-hydroxycalix[4]arene (TBHC) and 5-(4'-nitrophenyl)azo-25,26,27-tribenzoyloxy-28-hydroxycalix[4]arene (NTBHC) thin films on a gold electrode of a quartz crystal microbalance (QCM). The thin films were analyzed by atomic force microscopy (AFM). The humidity sensing properties, including sensitivity, sensing linearity, hysteresis, cross-sensitivity effects and long-term stability were also investigated. Water vapor molecules that were adsorbed onto the NTBHC thin film exhibited a larger frequency shift than those adsorbed onto TBHC thin films. Adsorption dynamic analysis and a molecular mechanical calculation (of the association constant) were made to elucidate the way in which a substituent on the upper and lower rims of calix[4]arene increases the sensitivity to humidity. (c) 2013 Elsevier B.V. All rights reserved.
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