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. 2019 Jul 4;19(13):2958. doi: 10.3390/s19132958

Figure 3.

Figure 3

(a–e) Panoramic SEM images of the NiO, SNM-2, SNM-4, SNM-8, and SNM-12 samples, respectively; (f–i) SEM image and the elemental mapping of the Ni, Sn and O in the SNM-8 sample.