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http://dx.doi.org/10.46670/JSST.2022.31.5.307

3D-Porous Structured Piezoelectric Strain Sensors Based on PVDF Nanocomposites  

Kim, Jeong Hyeon (Division of Advanced Materials Engineering, Jeonbuk National University)
Kim, Hyunseung (Division of Advanced Materials Engineering, Jeonbuk National University)
Jeong, Chang Kyu (Division of Advanced Materials Engineering, Jeonbuk National University)
Lee, Han Eol (Division of Advanced Materials Engineering, Jeonbuk National University)
Publication Information
Journal of Sensor Science and Technology / v.31, no.5, 2022 , pp. 307-311 More about this Journal
Abstract
With the development of Internet of Things (IoT) technologies, numerous people worldwide connect with various electronic devices via Human-Machine Interfaces (HMIs). Considering that HMIs are a new concept of dynamic interactions, wearable electronics have been highlighted owing to their lightweight, flexibility, stretchability, and attachability. In particular, wearable strain sensors have been applied to a multitude of practical applications (e.g., fitness and healthcare) by conformally attaching such devices to the human skin. However, the stretchable elastomer in a wearable sensor has an intrinsic stretching limitation; therefore, structural advances of wearable sensors are required to develop practical applications of wearable sensors. In this study, we demonstrated a 3-dimensional (3D), porous, and piezoelectric strain sensor for sensing body movements. More specifically, the device was fabricated by mixing polydimethylsiloxane (PDMS) and polyvinylidene fluoride nanoparticles (PVDF NPs) as the matrix and piezoelectric materials of the strain sensor. The porous structure of the strain sensor was formed by a sugar cube-based 3D template. Additionally, mixing methods of PVDF piezoelectric NPs were optimized to enhance the device sensitivity. Finally, it is verified that the developed strain sensor could be directly attached onto the finger joint to sense its movements.
Keywords
Wearable sensor; 3D-porous structure; PVDF nanoparticles; Piezoelectric sensor; Nanocomposite;
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