Cylindrical relative humidity sensor based on poly-vinyl alcohol (PVA) for wearable computing devices with enhanced sensitivity

Ju Hee Jang, Jeong In Han

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

In this paper, a wearable resistive-type humidity sensor is fabricated on a cylindrical organic substrate for the first time. This sensor contained polyvinyl-alcohol (PVA) as the sensing material, which was applied by the dip-coating method at the middle, and copper (Cu) thin film was applied by RF magnetron sputtering for the side electrodes. The resistance was measured for 60–90%RH. Thus, the value was decreased by hydrogen bonds between the hydroxyl groups and water molecules in the highly humid condition. In addition, as the dip-coating speed and number of coats varied, corresponding factors α and β, which were related to the activation energy, thickness, and/or conductance, were suggested based on Ohm's law and conductivity equations. Moreover, to verify its durability as a wearable computing device, repetitive bending tests were performed with different bending times and radii.

Original languageEnglish
Pages (from-to)268-273
Number of pages6
JournalSensors and Actuators A: Physical
Volume261
DOIs
StatePublished - 1 Jul 2017

Keywords

  • Cylindrical RH sensor
  • PVA RH sensor
  • Resistive type RH sensor
  • Wearable computing device
  • Wearable device

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