Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-05-13
Nanotechnology 19, 295202 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
To appear in Nanotechnology (2008)
Scientific paper
10.1088/0957-4484/19/29/295202
Several data sets of electrical breakdown in air of single-wall carbon nanotubes (SWNTs) on insulating substrates are collected and analyzed. A universal scaling of the Joule breakdown power with nanotube length is found, which appears independent of the insulating substrates used or their thickness. This suggests the thermal resistances at the interface between SWNT and insulator, and between SWNT and electrodes, govern heat sinking from the nanotube. Analytical models for the breakdown power scaling are presented, providing an intuitive, physical understanding of the breakdown process. The electrical and thermal resistance at the electrode contacts limit the breakdown behavior for sub-micron SWNTs, the breakdown power scales linearly with length for microns-long tubes, and a minimum breakdown power (~ 0.05 uW) is observed for the intermediate (~ 0.5 um) length range.
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