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http://dx.doi.org/10.7317/pk.2012.36.2.169

The Effect of Electrode Pattern on the Humidity-sensing Properties of the Resistive Humidity Sensor Based on All-printing Process  

Ahn, Hee-Yong (Deparment of Nanobiomedical Science and WCU Research Center of Nanobiomedical Science, Dankook University)
Gong, Myoung-Seon (Deparment of Nanobiomedical Science and WCU Research Center of Nanobiomedical Science, Dankook University)
Publication Information
Polymer(Korea) / v.36, no.2, 2012 , pp. 169-176 More about this Journal
Abstract
Based on our experience in developing resistive humidity sensor, interdigital gold electrodes with different fingers and gaps have been fabricated on a glass epoxy (GE) substrate using screen printing techniques. The basic structure of the electrode consisted of a 3-, 4- and 5-fingers with gaps of 310 and 460 ${\mu}m$. Gold electrode/GE was prepared by first printing silver nanopaste, followed by consecutive electroless plating of Cu, Ni and then Au. Copolymer of [2-(methacryloyloxy)ethyl] dimethyl benzyl ammonium chloride (MDBAC) and methyl methacrylate (MMA) was used as a humidity-sensing polyelectrolyte, which was fabricated by a screen printing method on the Au electrode/GE substrate. The flexible humidity sensor showed acceptable linearity between logarithmic impedance and relative humidity in the range of 20-95%RH, low hysteresis of 1.5%RH, good response and recovery time of 75 sec at 1 V, 1 kHz, and $25^{\circ}C$. Electrode construction had a significant influence on the humidity-sensing characteristics of polymeric humidity sensors. The activation energy between electrode and ion conducting polyelectrolyte plays an important role in explaining the differences of humidity sensing characteristics such as temperature dependence, sensitivity, linearity and hysteresis.
Keywords
humidity sensor; electrode finger; screen printing; glass epoxy substrate; electrode pattern;
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