Abstract
Abstract. Quartz crystal microbalance (QCM) coated with poly(3,4-ethylenedioxythiophene) and polystyrene sulfonate mixed with polyvinyl alcohol (PEDOT–PSS/PVA) nanofiber has been fabricated as a humidity sensor using the electrospinning method. Three types of PEDOT–PSS/PVA nanofiber sensors are fabricated with different needle-to-collector electrospinning distances. The scanning electron microscope images confirm the presence of beads in the nanofiber structure. The results show that the sensor mass deposition increased with the decrease in needle-to-collector distance. The best sensor performance is exhibited by the sample with medium needle-to-collector distance (QCM NF 2). The QCM NF 2 nanofiber sensor shows excellent sensitivity of up to 33.56 Hz per percentage point of relative humidity, with rapid response (5.6 s) and recovery (3.5 s) times, good linearity, excellent repeatability, low hysteresis, and long-term stability and response. The QCM PEDOT–PSS/PVA nanofiber sensor provides a simple method to fabricate high-performance humidity sensors.
Highlights
Various types of humidity sensors have been proposed (Lensch et al, 2019; Xu et al, 2019; Zhang et al, 2018)
We aim to develop a humidity sensor based on quartz crystal microbalance (QCM) chips using PEDOT–PSS/polyvinyl alcohol (PVA) to produce nanofiber as a sensing layer
The 3-D nature of the nanofiber sensor helps facilitate easy contact with water molecules, providing a good candidate for application as a sensitive humidity sensor based on the QCM
Summary
Various types of humidity sensors have been proposed (Lensch et al, 2019; Xu et al, 2019; Zhang et al, 2018). Several sensing methods, including resistance, capacitance, optical fiber, and quartz crystal microbalance (QCM), have been used to develop a humidity sensor (Blank et al, 2016; Xu et al, 2019). The QCM is often used to develop a gas or vapor sensor (Beißner et al, 2017; Li et al, 2019; Rianjanu et al, 2018d; Xu et al, 2018). Many researchers used the QCM to fabricate a highperformance humidity sensor (Jin et al, 2017; Nie et al, 2017). A humidity sensor based on the QCM provides realtime, accurate, and convenient detection
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