conditions. There were no significant changes of the catalytic activity of the sensor for 60 h over 5 days, with an R.S.D. of less than 5%
by collecting the CTL intensities once an hour. We characterized
the material by XRD after CTL reaction, and found that the com-
ponent of the material did not change except the morphology. We
also found that the nanomaterials partly fell from the ceramic rod
after 5-day reaction, which might lead to the short lifetime of the
sensor. The stable cataluminescence intensity of TiO2/SnO2 nano-
structure to benzene and toluene vapors provided such enhanced
cataluminescence performance.