Carbon nanotube volatile organic liquid sensor

Youngsik Song; Jaewu Choi
September 2009
Applied Physics Letters;9/21/2009, Vol. 95 Issue 12, p123122
Academic Journal
Volatile organic liquid sensors with two distinct configurations are developed for a future biosensor using laterally grown carbon nanotubes (CNTs) from two isolated metal electrodes. In the first configuration, the CNTs grown from each electrode weakly contact each other, and the charge transport between them is based on tunneling. In the second configuration, the CNTs in the array are covered with a silicone composite paste and strongly contact each other; Ohmic transport behavior is observed. The signal modulation amplitude with exposure to the volatile organic liquid is higher than two orders in magnitude. The sensing mechanism is based on the capillary force between CNTs and the swelling property of the silicone paste induced by the organic liquids.


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