TY - JOUR
T1 - Cylindrical relative humidity sensor based on poly-vinyl alcohol (PVA) for wearable computing devices with enhanced sensitivity
AU - Jang, Ju Hee
AU - Han, Jeong In
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/7/1
Y1 - 2017/7/1
N2 - 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.
AB - 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.
KW - Cylindrical RH sensor
KW - PVA RH sensor
KW - Resistive type RH sensor
KW - Wearable computing device
KW - Wearable device
UR - http://www.scopus.com/inward/record.url?scp=85019480520&partnerID=8YFLogxK
U2 - 10.1016/j.sna.2017.05.011
DO - 10.1016/j.sna.2017.05.011
M3 - Article
AN - SCOPUS:85019480520
SN - 0924-4247
VL - 261
SP - 268
EP - 273
JO - Sensors and Actuators A: Physical
JF - Sensors and Actuators A: Physical
ER -