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We report electron-beam activated motion of a catalytic nanoparticle along agraphene step edge and associated etching of the edge. This approach enablesbeam-controlled etching of matter through activated electrocatalytic processes.The applications of electron-beam control as a paradigm for molecular-scalerobotics are discussed.

Direct matter disassembly via electron beam control: Electron-beam-mediated catalytic etching of graphene by nanoparticles