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. 2017 Jun 7;17(6):1310. doi: 10.3390/s17061310

Figure 1.

Figure 1

(a) X-ray diffraction (XRD) patterns of TiO2, TiO2/SrTiO3, and SrTiO3; (b) UV-Visible absorption spectrum of gray TiO2/SrTiO3 composite; Inset is the picture of humidity sensors based on different samples.