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Self‐oscillations of carbon nanotube twist‐yarn during field emission

Electromechanical self‐oscillations were induced during field emission from the lateral surface of a twisted nanotube yarn obtained by solid‐state spinning from a forest of vertically aligned multi‐wall carbon nanotubes (CNT). Oscillations at several kilohertz frequencies were driven by applying a constant voltage between fixed opposite ends of the nanotube yarn and a flat anode. An electromechanical model is developed which explains the observed phenomenon. The model is equally applicable to any mechanically flexible field emitter including single nanoemitters like CNTs, which have shown a self‐oscillating behaviour in several previous in situ experiments. This phenomenon opens a possibility of developing a new type of devices for conversion of DC voltage into the high frequency electromagnetic oscillations utilizing flexible nanoemitters.