An angular velocity of flow sensor for liquids based on single-walled carbon nanotube
thin films is presented. The carbon nanotubes in this study were fabricated on Si substrate by hot
filament chemical vapor deposition (CVD). The experimental results showed that the flow-induced
current on the surface of carbon nanotube thin films was closely depended upon the angular
velocity, concentration, properties and temperature of the liquids. The current increased with
increasing angular velocity, concentration and temperature of the liquids. In this study, the liquids
such as water, NaCl solution and other electrolyte were flowing over the sensor. The results
obtained were also discussed. The theoretical and experimental studies have shown that there was
electronic friction and electron drag effect of carbon nanotubes in flowing liquids. This effect in
carbon nanotubes can be used for a new flow sensor.