Graphene Leaf Tattoos Turn Plants Into Living Moisture Meters (opens in new tab)

A hydrated leaf is a healthy leaf. That’s true for the leaves of crop plants in a farmer’s field, and for the leaves of trees in an area vulnerable to forest fires.But the traditional techniques to monitor leaf hydration require cutting them from their plants, which is time-consuming and cannot give live measurements. That’s why many researchers are building sensors that measure a plant’s health in real time.Now, researchers in Texas have developed a graphene “tattoo” that can be stuck direct...