Abstract
While the outstanding properties of graphene have attracted a lot of attention, one of the major bottlenecks of its widespread usage is its availability in large volumes. Laser printing graphene on polyimide films is an efficient single‐step fabrication process that can remedy this issue. A laser‐printed, flexible pressure sensor is developed utilizing the piezoresistive effect of 3D porous graphene. The pressure sensors performance can be easily adjusted via the geometrical parameters. They have a sensitivity in the range of 1.23 × 10−3 kPa and feature a high resolution with a detection limit of 10 Pa in combination with an extremely wide dynamic range of at least 20 MPa. They also provide excellent long‐term stability of at least 15 000 cycles. The biocompatibility of laser‐induced graphene is also evaluated by cytotoxicity assays and fluorescent staining, which show an insignificant drop in viability. Polymethyl methacrylate coating is particularly useful for underwater applications, protecting the sensors from biofouling and shunt currents, and enable operation at a depth of 2 km in highly saline Red Sea water. Due to its features, the sensors are a prime choice for multiple healthcare applications; for example, they are used for heart rate monitoring, plantar pressure measurements, and tactile sensing.
Highlights
Conventional pressure sensors are typically made of rigid materials and cannot conform to nonplanar surfaces.[4]
We demonstrate the use of laser-induced graphene (LIG) to fabricate piezoresistive, mechanically flexible, lightweight, and robust pressure sensors with a large measurement range, thereby offering promise across the whole spectrum of demands for pressure sensors
The SEM image of LIG under high magnification indicates that the entire volume of the LIG is composed of highly porous multilayer graphene flakes
Summary
Conventional pressure sensors are typically made of rigid materials and cannot conform to nonplanar surfaces.[4]. There is a growing demand for flex- tions for rollable touch displays, biomonitoring, and electronic ible and lightweight pressure sensors, requiring the develop- skins.[2] Despite extensive research and development in the ment or utilization of new technologies.[1,2,3] Extensive research field of pressure sensors, the fabrication process often requires has been undertaken to obtain robust pressure sensors for multiple steps, high-vacuum conditions, and time-consuming syntheses. Www.advancedsciencenews.com www.global-challenges.com this so-called laser-induced graphene (LIG) has been utilized to create numerous electronic devices in a single step.[16,17,18,19,20] In the present study, we demonstrate the use of LIG to fabricate piezoresistive, mechanically flexible, lightweight, and robust pressure sensors with a large measurement range, thereby offering promise across the whole spectrum of demands for pressure sensors. A 15 μm thick layer of PMMA (Kafrit, Inc.) was thermally laminated with a 4 min warm-up time (P42DE-WE, Atlas, Inc.)
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