With the flick of a switch, engineers from Drexel University's College of Engineering have created a thin film device that is made by spray coating and can block electromagnetic radiation. The innovation, made possible by adaptable two-dimensional materials known as MXenes, has the potential to improve the operation of electrical equipment, fortify wireless links, and protect mobile communications from hacking. The team, led by Yury Gogotsi, PhD, Distinguished University and Bach professor in Drexel's College of Engineering, previously demonstrated that the two-dimensional layered MXene materials, discovered just over a decade ago, when combined with an electrolyte solution, can be turned