Hydrogen sensing in titanate nanotubes associated with modulation in protonic conduction

作者：Alves D C B^*; Goncalves A M B; Campos L C; Avila E S; Lacerda R G; Ferlauto A S

来源：Nanotechnology, 2011, 22(23): 235501.

DOI：10.1088/0957-4484/22/23/235501

Hydrogen/sodium titanate nanotubes (TNTs) were investigated as hydrogen (H-2) sensors. TNT films exhibit good sensing properties and a large response, in particular at room temperature. Electrical conductivity measurements performed under different atmospheres from 25 to 300 degrees C indicate that, for T > 100 degrees C, conduction is thermally activated and can be attributed to electronic transport, whereas for T < 100 degrees C conduction is dominated by protonic transport. The T dependence of the H-2 sensitivity was determined and related to this variation in the dominant transport mechanism. For low T, H-2 sensing originates from the modulation in protonic conduction. Such modulation was attributed to the creation/destruction of surface hydroxyl groups.

• 出版日期2011-6-10