Laser-induced graphene (LIG) has spent most of a decade as a conference-poster trick: fire a CO₂ or UV laser at ordinary polyimide film and it carbonises into a porous graphene foam, no furnace, no catalyst, no vacuum chamber required. It was cheap, elegant, and for years stubbornly confined to single-sample demonstrations. That is now changing. Toolmakers serving the flexible-electronics supply chain are shipping roll-to-roll LIG patterning lines, and the process is moving from university laser cutters to production floors turning out flexible strain sensors, electrodes and micro-supercapacitors by the metre.
Why LIG, why now
Three things converged to pull LIG out of the lab. First, galvo-scanning laser heads borrowed from the PCB and display-repair industries got fast and cheap enough to pattern usable feature sizes at web speeds rather than sample-by-sample. Second, demand for low-cost flexible electrodes — for strain sensors, EMI shielding and small-format energy storage — grew faster than sputtering and screen-printing capacity could absorb. Third, LIG's single-step, additive-free process (no etchant, no plating bath, no post-cure) turned out to be exactly the kind of simplification a roll-to-roll line needs to hit throughput and yield targets simultaneously.
Where the volume is landing
Three design-in categories are absorbing the new capacity. Flexible strain and pressure sensors use LIG's porous, conductive foam directly as the sensing element — a natural complement to the printed pressure arrays we covered in soft robotics, and increasingly a competing option for the same rehab and prosthetics sockets. Micro-supercapacitors are the second category: LIG's high surface area makes it a serviceable electrode material for small-format energy storage sitting alongside — or instead of — the printed batteries we tracked in skin patches. EMI shielding films are the third, and the least glamorous: LIG's conductive foam patterned onto flexible substrate is cheap enough to displace sputtered-metal shielding in cost-sensitive consumer electronics.
LIG's pitch was always "graphene without the furnace." The missing piece was never the material — it was a tool that could pattern it fast enough to matter.
The honest caveats
LIG foam is mechanically weaker and less conductive than CVD-grown or reduced-graphene-oxide alternatives, and it only works well on laser-absorbing substrates — mainly polyimide, which caps how cheap the bill of materials can go. Registration accuracy at web speed remains the same hard problem we flagged in our roll-to-roll update: a laser head that drifts by fractions of a millimetre across a wide web ruins feature geometry long before it ruins throughput numbers. Expect LIG to keep winning in applications where "good enough and cheap" beats "best possible," not to displace CVD graphene or printed silver where performance is the spec.
What we're watching
- Wide-web LIG lines — the jump from lab-width to true production web widths is the gating step for cost parity with printed alternatives.
- Hybrid LIG-plus-ink stacks — pairing LIG electrodes with printed conductive traces to get around LIG's conductivity ceiling.
- Substrate diversification — any laser-absorbing, laser-safe substrate beyond polyimide would meaningfully widen LIG's addressable market.