A. Bachtold et al., CONTACTING CARBON NANOTUBES SELECTIVELY WITH LOW-OHMIC CONTACTS FOR 4-PROBE ELECTRIC MEASUREMENTS, Applied physics letters, 73(2), 1998, pp. 274-276
Contact resistances of multiwalled nanotubes deposited on gold contact
fingers are very large. We show that the contact resistances decrease
by orders of magnitudes when the contact areas are selectively expose
d to the electron beam in a scanning electron microscope. The focused
electron beam enables the selection of one particular nanotube for ele
ctrical measurement in a four-terminal configuration, even if a loose
network of nanotubes is deposited on the gold electrodes. For all meas
ured nanotubes, resistance values lie in a narrow range of 0.35-2.6 k
Omega at room temperature. (C) 1998 American Institute of Physics. [S0
003-6951 (98)04228-4].