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. 2018 Jun 29;4(7):929–937. doi: 10.1021/acscentsci.8b00359

Figure 5.

Figure 5

(a) Dynamic acetone-sensing transition in the concentration range 1–5 ppm of acetone at 450 °C. (b) Selective acetone-sensing characteristic of the double-Co3O4 rods@ZnO sheet against interfering analytes (H2S, CO, toluene, HCHO, NO, and NH3) at a concentration of 5 ppm at 450 °C. (c) Pattern recognition based on PCA using sensor arrays. (d) Suggested sensing mechanism toward acetone. (e) XPS spectra of double-Co3O4 rods@ZnO sheet: O 1s. (f) Pore distribution of Co3O4 rods, ZnO sheet, single-Co3O4 rods@ZnO sheet, double-Co3O4 rods@ZnO sheet, and triple-Co3O4 rods@ZnO sheet.