Graphene 'camera' captures real-time electrical activity of beating heart

(University of California - Berkeley) Scientists today track electrical signals and voltage changes in neurons and muscle cells by labeling individual cells or probing with electrodes. UC Berkeley and Stanford scientists have developed a new type of sensor that employs a sheet of graphene to get a continuous measure of electric field in these tissues. Electric fields change graphene's reflectance. The physicists found a way to amplify and measure the changes caused by action potentials in a beat...