| 초록 |
Sepiolite or halloysite is one of the clay materials, which can absorb moisture quickly due to its wide surface area originated from the porous structure. In this study, response time characteristics of humidity sensor was studied with polyelectrolyte composites containing sepiolite clay. The polyelectrolyte composites were prepared by mixing polyvinyl alcohol (PVA) with polydiallyldimethylammonium chloride (PDDA) or sodium polystyrene sulfonate (PSS), and sepiolite. To increase the water resistance of composites, chemical crosslinking of PVA was induced by addition of glutaraldehyde. Humidity sensors were prepared by coating of the composite material on an inter-digitated electrode. Electric impedance and sorption-desorption characteristics of the sensors were measured by using thermo-hygrostat at several different relative humidity and temperatures. The surface and blend morphology of the composites were observed with SEM. |
