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Electron tunneling between nanospaced electrodes provides a mechanism for directly transducing the presence of
molecular analytes into electrical signals. Crossbar junctions with vertical separations on the order of a few nanometers
were fabricated using a combination of electron-beam lithography and selective chemical etching. The current-voltage
properties of the nanojunctions are highly sensitive to the chemical environment. The tunneling currents increase over
one order of magnitude in response to water and organic vapors diluted with a background of pure nitrogen. The
resistance of the junctions is also dependent on the concentration of the analyte. These results demonstrate that
tunneling can be used to detect changes in the chemical environment.
Nicholas Prokopuk andKyung-Ah Son
"Nanocrossbar arrays as molecular sensors", Proc. SPIE 7679, Micro- and Nanotechnology Sensors, Systems, and Applications II, 76791C (5 May 2010); https://doi.org/10.1117/12.851308
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Nicholas Prokopuk, Kyung-Ah Son, "Nanocrossbar arrays as molecular sensors," Proc. SPIE 7679, Micro- and Nanotechnology Sensors, Systems, and Applications II, 76791C (5 May 2010); https://doi.org/10.1117/12.851308