Laser direct writing and characterizations of flexible piezoresistive sensors with microstructures

• DOI: 10.29026/oea.2021.200061
• Publication Date: 2021-04-05T23:33:22Z
• Authors: Chenying Zhang; ; Wei Zhou; Da Geng; Cheng Bai; Weida Li; Songyue Chen; Tao Luo; Lifeng Qin; Yu Xie
• Keywords: Piezoresistive effect; Molding (decorative)

Functional materials with high viscosity and solid have received more attentions in flexible pressure sensors, which are inadequate the most used molding method. Herein, laser direct writing (LDW) method is proposed to fabricate piezoresistive sensors microstructures on PDMS/ MWCNTs composites an 8% mass fraction. By controlling energy, different geometries can be obtained, significantly impacts performances of sensors. Subsequently, curved microcones excellent performance fabricated under parameters <italic>f</italic> = 40 kHz <italic>v</italic> 150 mm·s^-1. The sensor exhibits continuous multi-linear sensitivity, ultrahigh original sensitivity 21.80 % kPa^-1, wide detection range over 20 kPa, response/recovery time ~100 ms good cycle stability for than 1000 times. Besides, obvious resistance variation observed when tiny (a peanut 30 Pa) applied. Finally, applied LED brightness controlling, pulse voice recognition.