Research Article

Preparation, Characterization, and Evaluation of Humidity-Dependent Electrical Properties of Undoped and Niobium Oxide-Doped TiO2 : WO3 Mixed Powders

Figure 4

Raman spectra of the -doped sensors: (a) nondoped and the 2% weight doped sensors; (b) 2, 4, and 6% content of .
(a)
(b)