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http://dx.doi.org/10.7317/pk.2012.36.4.486

Preparation of Humidity Sensor Using Novel Photocurable Sulfonated Polyimide Polyelectrolyte and their Properties  

Lim, Dong-In (Department of Nanobiomedical Science and WCU Research Center of Nanobiomedical Science, Dankook University)
Gong, Myoung-Seon (Department of Nanobiomedical Science and WCU Research Center of Nanobiomedical Science, Dankook University)
Publication Information
Polymer(Korea) / v.36, no.4, 2012 , pp. 486-493 More about this Journal
Abstract
Photocurable sulfonated polyimide (SPI) polyelectrolyte containing chalcone group was prepared and fabricated on an alumina electrode pretreated with chalcone-containing silane-coupling agent. SPI films with bis(tetramethyl)ammonium 2,2'-benzidinedisulfonate ($Me_4N$-BDS)/4,4'-diaminochalcone (DAC)/pyromellitic dianhydride (PA)= 90/10/100 possessed very linear response(Y = -0.04528X+7.69446, $R^2=0.99675$) and showed resistance changing from 4.48 to $2.1k{\Omega}$ between 20 and 95 %RH. The response time for absorption and desorption measurements between 33 and 94 %RH% was about 79 s, which affirmed the high efficiency of crosslinked SPI film for rapid detection of humidity. A negative temperature coefficient showing $-0.49%RH/^{\circ}C$ was found and proper temperature compensation should be considered in future applications. Moreover, pretreatment of the substrates with chalcone-containing silane-coupling agent was performed to improve the water durability and the stability of the humidity sensors at a high humidity and a high temperature and long-term stability for 480 h. The crosslinked SPI films anchored to electrode substrate could be a promising material for the fabrication of efficient humidity sensors with superior characteristics compared to the commercially available sensors.
Keywords
humidity sensor; chalcone; sulfonate polyimide; water durability; anchoring;
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