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Summary form only given. Carbon nanotubes (CNTs) have attracted much attention in sensor applications because they are highly sensitive to molecular adsorption on the tube wall or within the tubes. The random networks of CNTs can be easily produced either by direct growth on a catalyzed substrate or by deposition onto a substrate from a carbon nanotube suspension, and their electrical properties are governed by the percolative paths of the nanotubes in conduction channels, where the sample-to-sample variations are expected to be relatively small. Such devices have been found to be very sensitive to adsorption of deoxyribonucleic acid or biomolecules.