Single-Walled Carbon Nanotubes as Shadow Masks for Nanogap Fabrication
E. P. De Poortere, L. M. Huang, M. Huang, S. J. Wind, S. O'Brien, J. Hone, H. L. Stormer
Abstract
We describe a technique for fabricating nanometer-scale gaps in Pt wires on insulating substrates, using individual single-walled carbon nanotubes as shadow masks during metal deposition. More than 80% of the devices display current-voltage dependencies characteristic of direct electron tunneling. Fits to the current-voltage data yield gap widths in the 0.8-2.3 nm range for these devices, dimensions that are well suited for single-molecule transport measurements.
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