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Density functional methods have been used to calculate the electronicproperties of aligned smalldiameter single-walled carbon nanotubes underhydrostatic pressures. Abrupt pressure induced semiconductor-metal andmetal-semiconductor transitions concomitant with changes in structure areobserved. Novel and unexpected unit cell nanotube cross-sections are found.These tubes are observed to form interlinking structures at very highpressures. The large changes in electronic structure and the ability ofdifferent small diameter nanotubes to respond in different pressure regimessuggest their use in high pressure multiple switching devices.

Pressure Effects on the Atomic and Electronic Structure of Aligned Small Diameter Carbon Nanotubes