| Title |
Effect of Metal Film Thickness on Strain-Sensing Performance of Crack-Based Stretchable Hybrid Piezoresistive Electrode |
| Authors |
노지연(Ji-Yeon Noh); 김미래(Mirae Kim); 김종만(Jong-Man Kim) |
| DOI |
https://doi.org/10.3365/KJMM.2022.60.12.933 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
stretchable strain sensor; mechanical crack; conductive composite; metal film thickness |
| Abstract |
In recent decades, many research efforts have been devoted to developing high-performance stretchable strain sensors due to their potential for application in various emerging wearable sensor systems. This work presents a facile yet highly efficient way of modulating the sensing performance of a thin metal film/conductive composite hybrid piezoresistor-based stretchable strain sensor by simply controlling the metal film thickness. The hybrid strain sensor can be simply fabricated by sputtering a thin platinum (Pt) film onto a silver nanowire (AgNW)/dragon skin (DS) composite substrate prepared via a facile embed-and-transfer process in a reproducible manner. The density of the network-shaped mechanical crack induced in the Pt film tended to decrease with increasing the Pt thickness, thereby leading to a higher gauge factor of the sensor. The fabricated hybrid strain sensor also exhibited a large stretchability of 150% owing to its electrical robustness under strain, based on the unique morphology, formed of the network-shaped Pt crack and AgNW percolation network embedded in the DS matrix. Thanks to the balanced strain-sensing performance of the hybrid strain sensor in conjunction with large stretchability, the device was successfully demonstrated as a wearable human-activity monitoring solution that can monitor a wide range of human motions in real time.(Received 14 July, 2022; Accepted 16 September, 2022) |