Figure 1 | Scientific Reports

Figure 1

From: Positive impedance humidity sensors via single-component materials

Figure 1

XRD (a) and XPS (b) patterns of the samples. The WO2.9, WO2.89 and WO2.72 crystals were synthesized by thermal evaporation of WO3 powder in S atomsphere at the selected temperature of 950, 1050 and 1150 °C, respectively. The WO3 crystals were synthesized at 1150 °C but further annealed at 500 °C in air for 2 h in a muffle furnace.

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