Research Article

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

Figure 1

SEM micrographs of the -doped sensors with 2% (a), 4% (b), and 6% (c) content of .
(a)
(b)
(c)