An embodiment includes a transistor and a method of manufacturing the transistor that includes carbon nano-tubes. The physical behavior of the carbon nano-tubes, particularly a bending action that alters a normally linear configuration, is affected by elements of the transistor, such as a space between the carbon nano-tube and a conductor. The space is formed by removing a spacer. A dimension of the spacer between the carbon nano-tube and the conductor is efficiently controlled by adjusting its width. An operation voltage of the transistor relates to the physical behavior of the carbon nano-tubes, and thus to the dimensions of the spacer.