Photochemical attachment of polyelectrolyte membrane to electrode substrate and their humidity-sensitive properties
New cinnamate group-containing copolymers for a humidity-sensitive polyelectrolyte were prepared by copolymerization of [2-[(methacryloyloxy)ethyl]dimethyl]propyl ammonium bromide (MEPAB), methyl methacrylate (MMA) and 2-(cinnamyloxy)ethyl methacrylate (CEMA). They were self-crosslinkable terpolymer...
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Published in | Sensors and actuators. B, Chemical Vol. 147; no. 1; pp. 330 - 336 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
18.05.2010
|
Subjects | |
Online Access | Get full text |
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Summary: | New cinnamate group-containing copolymers for a humidity-sensitive polyelectrolyte were prepared by copolymerization of [2-[(methacryloyloxy)ethyl]dimethyl]propyl ammonium bromide (MEPAB), methyl methacrylate (MMA) and 2-(cinnamyloxy)ethyl methacrylate (CEMA). They were self-crosslinkable terpolymers composed of different contents of MEPAB/MMA/CEMA
=
70/27/3, 70/25/5, 70/23/7 and 70/20/10. Pretreatment of the alumina substrate with 3-(triethoxysilyl)propyl cinnamate (TESPC) containing silane-coupling agent was performed to attach the humidity-sensitive membrane to the substrate through covalent bonds. The sensors were irradiated with UV light, causing the electronically excited cinnamate molecules to form a crosslinking reaction via the [2π
+
2π] addition. The impedance ranged from 10
7 to 10
3
Ω between 20 and 95%RH, which was required for a humidity sensor operating at ambient humidity. Water durability, hysteresis, response time and long-term stability at high temperature and humidity were also measured and estimated. |
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ISSN: | 0925-4005 1873-3077 |
DOI: | 10.1016/j.snb.2010.03.022 |