We investigated a carbon nanotube (CNT) oscillator controlled by the thermal gas expansion using classical molecular
dynamics simulations. When the temperature rapidly increased, the force on the CNT oscillator induced by the thermal
gas expansion rapidly increased and pushed out the CNT oscillator. As the CNT oscillator extruded from the outer
nanotube, the suction force on the CNT oscillator increased by the excess van der Waals vdW energy. When the CNT
oscillator reached at the maximum extrusion point, the CNT oscillator was encapsulated into the outer nanotube by the
suction force. Therefore, the CNT oscillator could be oscillated by both the gas expansion and the excess vdW interaction.
As the temperature increased, the amplitude of the CNT oscillator increased. At the high temperatures, the CNT
oscillator escaped from the outer nanotube, because the force on the CNT oscillator due to the thermal gas expansion was
higher than the suction force due to the excess vdW energy. By the appropriate temperature controls, such as the
maximum temperature, the heating rate, and the cooling rate, the CNT oscillator could be operated.