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. 2013 Sep 17;13(9):12467–12481. doi: 10.3390/s130912467

Figure 13.

Figure 13.

DRIFT spectra of Co3O4 powder at 100 °C. The powders were exposed to 1 ppm of NO in air for (a) 2 min, (b) 20 min, and (c) 50 min. After NO exposure, the powders were purged by air for (d) 1 min, (e) 30 min, and (f) 60 min.