Skip to main content
. 2020 Feb 5;20(3):850. doi: 10.3390/s20030850

Figure 2.

Figure 2

(a) Scanning electron microscope (SEM) image of as-prepared powder cross-section of gas sensor pellet annealed at 850 °C for 3 h and (b) CaFe2O4 nanoparticles on the gold-interdigitated electrodes (Au–IDE) annealed at 450 °C for 1 h prepared by the spin coating process.