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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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Scientists Just Built Electronics That Stretch Like Skin. Here’s How It Works

In recent years, electronics have started to move beyond rigid circuit boards and stiff devices. Scientists are now developing stretchable and flexible electronic systems that can bend, twist, fold, and even stretch like skin while still working normally. These innovations are opening doors to entirely new technologies such as wearable health monitors, electronic skin, flexible displays, and even brain-interfacing medical implants.

A major breakthrough in this field has been presented by Alexandre Larmagnac and his research team, who developed a simple, low-cost method to create large-scale stretchable electronic circuit boards, called soft printed circuit boards (soft PCBs). Their approach avoids expensive cleanroom processes and instead uses practical printing techniques that could be adapted for mass production.

Why Stretchable Electronics Matter

Traditional electronics are built on rigid materials like silicon and fiberglass. While these materials are excellent for performance, they are not flexible. This creates a limitation when we want electronics to interact with soft, moving, or curved surfaces like the human body.

Stretchable electronics solve this problem. They allow devices to:

  • Bend with clothing or skin

  • Stretch without breaking

  • Conform to complex shapes like organs or tissues

  • Move naturally with the body

This makes them extremely useful in areas like:

  • Healthcare sensors for continuous monitoring

  • Electronic skin for robotics and prosthetics

  • Flexible displays that can roll or fold

  • Brain and heart interfaces for medical treatment

However, creating reliable stretchable circuits has been a major challenge for scientists.

The Challenge in Making Stretchable Circuits

Over the past decade, researchers have explored many ways to make electronics stretchable. Some of the common approaches include:

  • Designing metal traces in wavy or spring-like shapes

  • Using thin gold or flexible silicon nanostructures

  • Embedding liquid metals inside soft materials

  • Mixing conductive particles into rubber-like polymers

While these methods work, they often come with problems. Many are expensive, difficult to scale, or incompatible with standard electronic manufacturing methods. Most importantly, they do not behave like traditional printed circuit boards (PCBs), which are widely used in all modern electronics.

This created a gap: scientists needed a method that could combine stretchability with standard PCB design and manufacturing simplicity.

A New Approach: Soft Printed Circuit Boards

To solve this challenge, Alexandre Larmagnac and his team developed a new method to build all-elastomeric stretchable PCBs. These are called soft PCBs because they are made entirely from flexible materials but still function like traditional circuit boards.

The key idea behind their method is simple yet powerful:
They directly print conductive tracks made of a silver and silicone mixture (Ag-PDMS) onto a soft rubber-like material called PDMS (polydimethylsiloxane).

This creates circuits that are both conductive and highly stretchable.

How the Soft PCB is Made

The process developed by the researchers is surprisingly simple and does not require a cleanroom. It involves a few key steps:

  1. Printing Conductive Tracks
    A mixture of silver particles and PDMS (Ag-PDMS) is stencil-printed onto a flexible PDMS base layer. These printed lines act as electrical pathways.

  2. Creating Double Layers
    A second PDMS layer is bonded on top of the first one to create a full circuit structure.

  3. Adding Vias (Vertical Connections)
    Small holes are punched through the layers and filled with the same Ag-PDMS mixture. These act as vertical connections between layers, similar to vias in traditional PCBs.

  4. Mounting Electronic Components
    Standard electronic components are attached using silver epoxy, a conductive adhesive that ensures both electrical connection and mechanical flexibility.

The result is a fully functional, stretchable circuit board that can host real electronic components.

Strong Performance Under Stretching

One of the most impressive results of this research is the durability of these soft PCBs.

The circuits were tested under repeated stretching cycles—hundreds of times—and showed no mechanical failure. Even when stretched, the electrical performance remained stable.

Some key performance features include:

  • High electrical conductivity

  • Low resistance (~2 ohms per cm for tracks)

  • Stability under repeated deformation

  • Ability to maintain function while stretching

Interestingly, the researchers also discovered that narrower printed lines showed even better conductivity, likely because the silver particles pack more tightly together during printing.

Compatibility with Standard Electronics

A major advantage of this system is that it works with regular commercial electronic components, just like standard PCBs.

Instead of using complex bonding techniques or special flexible components, the researchers used:

  • Silver epoxy for attaching components

  • Straight conductive tracks (like normal PCBs)

  • Standard design and routing methods

They even demonstrated compatibility with ZIF (Zero Insertion Force) connectors, which allow easy connection between flexible and rigid electronics.

This makes the technology much more practical for real-world applications.

Demonstration: A Stretchable Clock Circuit

To prove the concept, the team built a working stretchable astable clock generator circuit using their soft PCB method. The circuit functioned properly even when stretched and bent, showing that complex electronic systems can now be made flexible.

Medical and Biomedical Applications

One of the most exciting applications of this technology is in medicine.

Because soft PCBs are flexible and soft like biological tissue, they can be used to create:

  • Brain interfaces

  • Spinal cord implants

  • Heart monitoring devices

  • Neural stimulation systems

Traditional rigid implants can damage delicate tissues. However, silicone-based stretchable electronics move naturally with the body, reducing injury and improving long-term safety.

This could lead to a new generation of neuroprosthetic devices, helping restore movement, sensation, or control in patients with neurological disorders.

Why This Innovation Is Important

This research is important because it bridges the gap between flexible materials science and traditional electronics manufacturing.

The main advantages include:

  • Simple and low-cost production

  • No need for cleanroom facilities

  • Compatibility with standard PCB design tools

  • Ability to scale for large-area production

  • Strong mechanical durability

  • Real electronic functionality with commercial components

In short, it makes stretchable electronics easier to build, more practical, and more accessible.

Future Possibilities

This technology could lead to major advancements in several fields:

  • Smart clothing that monitors health

  • Soft robots with electronic skin

  • Foldable or wearable smartphones

  • Medical implants that move with organs

  • Brain-machine interfaces with minimal tissue damage

As the technology improves, we may see electronics that no longer feel like rigid machines—but like part of the human body itself.

Conclusion

The development of soft printed circuit boards represents a major step forward in electronics engineering. By combining simple printing methods with stretchable materials, Alexandre Larmagnac and his team have shown that it is possible to create durable, functional, and scalable flexible circuits.

This innovation not only solves long-standing technical challenges but also opens the door to a future where electronics are no longer limited to rigid shapes. Instead, they can bend, stretch, and adapt—just like living tissue.

The age of truly flexible electronics has begun.

Reference: Larmagnac, A., Eggenberger, S., Janossy, H. et al. Stretchable electronics based on Ag-PDMS composites. Sci Rep 4, 7254 (2014). https://doi.org/10.1038/srep07254

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