Fabien Resweber | Alqio: Beyond just supplying functional films, can you print a complete, multi-layer piezoelectric sensor directly onto a substrate?

Can flexible PVDF polymers replace heavy ceramic piezoelectrics at high temperatures?

Replacing rigid piezoelectric ceramics with flexible polymer alternatives requires precise molecular control. PVDF copolymers and terpolymers must undergo a polling process to orient their molecular dipoles. Once aligned, these flexible films can convert mechanical strain into high-fidelity electrical signals, or conversely, vibrate in response to an applied voltage to serve as actuators or acoustic transmitters.

Unlike brittle piezoelectric ceramics, these co-polymer films are incredibly lightweight, mechanically resilient, and easily formed into complex, conformal geometries. This structural flexibility opens up novel integration pathways in wearable electronics, haptic feedback devices for virtual reality, and lightweight acoustic transducers.

Furthermore, thermal stability remains a critical milestone for organic functional materials. These printed electroactive films maintain robust piezoelectric performance and dipole stability at temperatures reaching up to 130°C, making them suitable for demanding industrial and automotive environments.

In this short video, you can learn:
* The molecular mechanics of PVDF copolymer and terpolymer dipole orientation for piezoelectric and electroactive performance.
* How flexible organic piezoelectrics overcome the mechanical limitations of traditional brittle ceramics.
* The thermal boundaries of printed piezoelectric films, highlighting stable operation up to 130°C.
📋 **Clip Abstract** Learn how flexible PVDF-based copolymers and terpolymers are processed into lightweight electroactive films for advanced haptics and acoustic applications. This clip details the physics of molecular dipole orientation and explains how these organic materials maintain stable performance at high operating temperatures.
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How do you scale multi-material functional surfaces without sacrificing thin-film performance?

Scaling functional surfaces from the lab to high-volume manufacturing demands seamless integration of diverse deposition techniques. When producing large-area heating patches or selective membranes, manufacturers must transition from discrete patch printing to continuous, high-speed processes. This requires optimizing ink rheology to prevent defects over large areas.

A highly effective manufacturing strategy involves combining continuous roll-to-roll slot-die coating with precision screen printing. For instance, a continuous carbon-based resistive layer can be deposited across the web, followed by the localized printing of highly conductive silver busbars. Alternatively, physical copper foil busbars can be laminated directly onto the edges to handle higher currents.

Following functional layer deposition, post-processing steps such as laser cutting, lamination, and potting are integrated inline. This allows for the high-yield fabrication of thin, flexible heating elements and selective filtration membranes ready for integration into automotive cabins, smart flooring, or energy storage devices.

In this short video, you can learn:
* The roll-to-roll and sheet-to-sheet scaling of multi-material functional surfaces.
* Hybrid manufacturing methods that combine large-area continuous carbon coatings with screen-printed busbars.
* Post-processing conversion techniques including lamination, potting, and precision laser cutting.
📋 **Clip Abstract** Explore Alqio's scalable manufacturing processes for producing thin-film functional surfaces like selective membranes and heating patches. Learn how continuous web-coating is combined with precision-printed conductive busbars to deliver reliable, large-area thermal solutions.
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What does the physical stack architecture of a screen-printed flexible sensor look like?

Designing a reliable, flexible printed sensor requires a robust multilayer stack-up. The process begins with substrate selection, where materials like PET, polyimide, TPU, or even specialized papers are chosen based on the mechanical requirements and operating temperatures of the target application. This substrate must provide stable adhesion for subsequent ink layers.

The functional layers are deposited using high-precision sheet-to-sheet or roll-to-roll screen printing. A typical stack-up consists of a base electrode, a five-to-six-micron active piezoelectric copolymer layer, and a top counter-electrode, all routed to silver ink trace connections. Maintaining tight tolerance on the thickness of the printed piezo layer is critical to ensuring uniform sensor sensitivity and preventing electrical shorting.

To protect the active stack from environmental degradation, moisture, and mechanical wear, a protective lamination or encapsulation layer is applied. This produces a highly sensitive, low-profile sensor capable of capturing dynamic pressure changes and acoustic emissions in harsh environments.

In this short video, you can learn:
* The exact multilayer stack architecture of a printed flexible piezoelectric sensor.
* How substrate selection, from PET to TPU, dictates the mechanical boundaries of the sensor.
* Printing and encapsulation techniques used to deposit 5-6 micron active layers with silver trace connections.
📋 **Clip Abstract** Discover the exact physical layers and manufacturing steps required to build a flexible, ready-to-use printed piezoelectric sensor. This segment details the deposition of a micro-thin active copolymer layer between printed electrodes and discusses the critical role of protective lamination.
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