TiO2 nanotubes are the building units of various devices of energy- and environment-related applications and the property studies of individual TiO2 nanotubes are important to understand and improve the performance of TiO2 nanotubes-based devices. Here we report the electrical property study of individual TiO2 nanotubes enabled by the construction of field effect transistors based on individual TiO2 nanotubes. It is found that individual TiO2 nanotubes exhibit typical n-type electrical conduction characteristics, with electron mobility of 6.9 x 10(-3) cm(2)/V s at V-ds = 1 V. and electron concentration of 2.8 x 10(17) cm(-3). Moreover, the on-off ratio of the TiO2 nanotube-based field effect transistors is as high as 10(3). Humidity sensing test shows the sensitive response of the individual TiO2 nanotubes to water vapor. (C) 2011 Elsevier Ltd. All rights reserved.