Dense alignment of single-walled carbon nanotubes over a large area is demonstrated using a novel solution-shearing technique. A density of 150-200 single-walled carbon nanotubes per micrometer is achieved with a current density of 10.08 μA μm−1 at VDS = −1 V. The on-current density is improved by a factor of 45 over that of random-network single-walled carbon nanotubes.