Researchers from the University of Science and Technology of China developed a new robot that's made by layering a polyethylene film onto a glass layer and an adding a layer of graphene that is used to convert photothermal energy from infra red light. The robot can pick, move and drop objects. Such a design may be useful for surgery, for example. It can also inspire the design of transparent artificial muscles:

http://www.graphene-info.com/robot-demonstrates-photothermal-energy-conversion-graphene-oxide-based-actuators