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. 2017 Jan 18;10(1):77. doi: 10.3390/ma10010077

Figure 1.

Figure 1

Figure 1

SEM images of the (a1–a3) V2O5 precursor and V2O5 microspheres annealed at 300 °C (b1–b3); 400 °C (c1–c3); and 500 °C (d1–d3).