Highly Sensitive Textile-Based Capacitive Pressure Sensors Using PVDF-HFP/Ionic Liquid Composite Filmsopen access
- Authors
- Keum, Kyobin; Heo, Jae Sang; Eom, Jimi; Lee, Keon Woo; Park, Sung Kyu; Kim, Yong-Hoon
- Issue Date
- Jan-2021
- Publisher
- MDPI
- Keywords
- electronic textiles; capacitive pressure sensors; PVDF-HFP; ionic liquid; contact area
- Citation
- SENSORS, v.21, no.2, pp 1 - 11
- Pages
- 11
- Journal Title
- SENSORS
- Volume
- 21
- Number
- 2
- Start Page
- 1
- End Page
- 11
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/43941
- DOI
- 10.3390/s21020442
- ISSN
- 1424-8220
1424-3210
- Abstract
- Textile-based pressure sensors have garnered considerable interest in electronic textiles due to their diverse applications, including human-machine interface and healthcare monitoring systems. We studied a textile-based capacitive pressure sensor array using a poly(vinylidene fluoride)-co-hexafluoropropylene (PVDF-HFP)/ionic liquid (IL) composite film. By constructing a capacitor structure with Ag-plated conductive fiber electrodes that are embedded in fabrics, a capacitive pressure sensor showing high sensitivity, good operation stability, and a wide sensing range could be created. By optimizing the PVDF-HFP:IL ratio (6.5:3.5), the fabricated textile pressure sensors showed sensitivity of 9.51 kPa(-1) and 0.69 kPa(-1) in the pressure ranges of 0-20 kPa and 20-100 kPa, respectively. The pressure-dependent capacitance variation in our device was explained based on the change in the contact-area formed between the multi-filament fiber electrodes and the PVDF-HFP/IL film. To demonstrate the applicability and scalability of the sensor device, a 3 x 3 pressure sensor array was fabricated. Due to its matrix-type array structure and capacitive sensing mechanism, multi-point detection was possible, and the different positions and the weights of the objects could be identified.
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