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A 2017 laboratory coating made from aligned graphene flakes changed colour as it deformed and developed tiny cracks: red when undamaged, yellow under deformation, and green when cracked at the micrometre scale. The effect could make early damage easier to see, but the work was a research demonstration—not a deployed monitoring product.
What the colour-changing graphene coating showed
In a 2017 report, a team led by Shanglin Gao at the Leibniz Institute of Polymer Research described a coating made from carefully aligned, semi-transparent graphene nanoplatelets arranged in parallel layers on a glass fibre. The coating’s colour provided a visible indication of changes in the material.
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- Red: the reported undamaged state.
- Yellow: deformation.
- Green: cracks at the micrometre scale.
The team presented the effect as a way to make small changes visible, rather than as a measurement system with a reported general accuracy or performance figure. Chemistry World’s 2017 report describes the demonstration and its limitations.
Why the coating changes colour
The colour is structural, not the result of a chemical pigment. Microscopic structures can make reflected light waves interfere with one another, producing colour. In this coating, stress changes the geometry of the aligned graphene-flake layers: they compress and flatten, altering the interference and therefore the colour seen by an observer.
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Gao explained the motivation this way: “Structural failure usually starts with tiny cracks and deformations,” and “Generally, these microscale cracks are hard to detect.” A colour shift could make such changes easier to notice without relying on a conventional inspection to reveal every small defect.
What it could be used for—and what is not established
The proposed use is visual monitoring of materials that may develop damage before a larger failure. Buildings and vehicles were mentioned as possible applications; they are not demonstrated deployments. Michael Bartl, an expert in micro- and nanophotonics at the University of California, Berkeley, described the broader potential: “Such materials have enormous potential as non-destructive, integrated sensors for monitoring the health of composites used in buildings, cars and airplanes.” That statement concerns potential, not proof that the graphene coating has been installed or validated in those settings.
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Gao also cautioned that practical use would require more study: “Real-world applications, however, will first require much more knowledge about the properties and behaviour of the coating.” The 2017 report does not establish field validation, service life, environmental durability, or commercialization.
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How this differs from later graphene sensor research
Other graphene-based sensing studies use different material stacks and produce different outputs. They are related research, not evidence that the 2017 colour-changing coating evolved into a product.
| Research | Construction and output | Focus |
|---|---|---|
| 2017 colour-changing coating | Aligned graphene nanoplatelets on glass fibre; visible structural colour changes with deformation and micrometre-scale cracks. | Making possible material damage visible; proposed applications include buildings and vehicles. |
| 2018 multilayer graphene epidermal electronic skin | Laser-scribed graphene; electronic strain sensing and motion detection. | Wearable sensing. See the 2018 ACS Nano paper. |
| 2025 wearable photonic-electric skin | Reduced graphene oxide and PDMS on silica photonic crystals with a PEGPEA film; optical and electrical responses to stress. | Wearable strain and joint-movement monitoring. See the 2025 Sensors and Actuators A: Physical paper. |
The later wearable work combines visual and electrical responses and describes a small-current detection device based on an STM32 chip. Those are features of that separate prototype, not measurements or capabilities established for the 2017 coating.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Has the 2017 coating become a product?
The available reporting does not establish that the exact coating has been commercialized. It describes a laboratory demonstration and says further knowledge of its properties and behaviour is needed before real-world applications. That is not enough to conclude either that commercialization occurred later or that it did not; it does mean the coating should not be treated as a product available for purchase on the evidence cited here.
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