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. 2022 May 29;22(11):4125. doi: 10.3390/s22114125

Figure 6.

Figure 6

Comparison of XRD patterns of the original and additionally heat-treated sensors (Inline graphic: Al2O3, Inline graphic: Pt, Inline graphic: ZnO peak, (a,c) U30 sensor; (b) U30-N sensor; (d) U30-O sensor).