Highly responsive screen-printed asymmetric pressure sensor based on laser-induced graphene

Abstract

Graphene-based pressure sensors have received extensive attention in wearable devices. However, reliable, low-cost, and large-scale preparation of structurally stable graphene electrodes for flexible pressure sensors is still a challenge. Herein, for the first time, laser-induced graphene (LIG) powder are prepared into screen printing ink, and shape-controllable LIG patterned electrodes can be obtained on various substrates using a facile screen printing process, and a novel asymmetric pressure sensor composed of the resulting screen-printed LIG electrodes has been developed. Benefit from the 3D porous structure of LIG, the as-prepared flexible LIG screen-printed asymmetric pressure sensor has super sensing properties with a high sensitivity of 1.86 kPa−1, low detection limit of about 3.4 Pa, short response time, and long cycle durability. Such excellent sensing performances give our flexible asymmetric LIG screen-printed pressure sensor the ability to realize real-time detection of tiny body physiological movements (such as wrist pulse and pronunciation action). Besides, the integrated sensor array has a multi-touch function. This work could stimulate an appropriate approach to designing shape-controllable LIG screen-printed patterned electrodes on various flexible substrates to adapt the specific needs of fulfilling compatibility and modular integration for potential application prospects in wearable electronics.

Printed flexible mechanical sensors

“…147 Their sensor's sensitivity is higher compared to all other graphene-based pressure sensors shown in Fig. 6, 54,58,151 and it is the second highest among all the piezoresistive pressure sensors (55.0 kPa −1 in the 0–100 kPa pressure range, and 24.9 kPa −1 and 10.8 kPa −1 in the respective pressure ranges 100–200 kPa and 200–400 kPa). It can be seen in Fig.…”

Pressure‐Temperature Dual‐Parameter Flexible Sensors Based on Conformal Printing of Conducting Polymer PEDOT:PSS on Microstructured Substrate

“…[26,27] As an additive manufacturing method, the printing technique has the advantages of low-cost, large-area fabrication and device flexibility. In previous research, [28][29][30] screen printing has been proven as an effective method to prepare sensing materials and an electrode array. However, conformal printing of functional ink on the surface of microstructured substrate, obtaining the thin-film conductive layer, and maintaining the microstructure simultaneously, is still challenging.…”

Screen-Printing Preparation of High-Performance Nonenzymatic Glucose Sensors Based on Co3O4 Nanoparticles-Embedded N-Doped Laser-Induced Graphene

“…Although many LIG-based devices have been developed by laser scribing of heterogeneous precursors coated on the surface of PI films, they are faced with problems such as limiting types of dopant precursors due to the surface affinity and LIG being readily detached from PI substrates and easily deforming device structures. 32 According to this, our group successfully mass-produced high-quality graphene powder by scraping directly from a laser-scribed PI film and made it into a screen-printing paste to prepare a highly sensitive asymmetric pressure sensor, 33 which provided a feasible solution for the preparation of functional LIG-based screen-printing pastes.…”