Humidity-Sensitive Characteristics and Reliabilities of Polymeric Humidity Sensor Containing Phosphonium Salts

포스포늄 염을 가진 고분자 습도센서의 감습 특성 및 신뢰성

  • Received : 1998.02.17
  • Accepted : 1998.04.07
  • Published : 1998.08.10

Abstract

Vinylbenzyl triphenyl phosphonium chloride(VTPC)/styrenes=3.7 copolymer was prepared for the moisture-absorptive polyelectrolyte dew sensor containing phosphonium salts. The humid membrane was fabricated on the gold/alumina electrode by dipping. The impedances were $11M{\Omega}$, $980k{\Omega}$, $50k{\Omega}$, and $11k{\Omega}$ at 70%RH, 80%RH, 90%RH and 95%RH, respectively, at $25^{\circ}C$ and the humidity-sensitive charactristic was suitable for the dew sensor. The temperature-dependent coefficient between $15^{\circ}C$ and $35^{\circ}C$ was found to be $-0.25%RH/^{\circ}C$ and the hysteresis falled in the ${\pm}2%RH$ range. The response time was found to be 45 sec for the relative humidity ranging from 70%RH to 98%RH at $25^{\circ}C$. The reliabilities such as temperature cycle, humidity cycle, high temperature and humidity resistance, electrical load stability, stability of long-term storage and water durability were measured and evaluated for the application as a dew sensor.

Keywords

Humidity Sensor;Dew Sensor;Vinylbenzyl Triphenyl Phosphonium Chloride;Reliability

Acknowledgement

Supported by : 한국학술진흥재단

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