Interesting study. Using cortisol to make a functional template seems like a more promising approach than functionalizing the sensor with an antibody (as in other cortisol sensing literature), especially since they are using an elastometic substrate.

As with most electrochemical sensing studies, this is much closer to proof of concept than manufacturable product. Measuring things on skin in sweat is hard work.

That being said, I’d love a patch to measure my stress levels and hope some day the tech exists to do so.