Figure 3.

SEM images of heat-treated electrospun fibers under different conditions. (A) 550°C, N2; (B) 550°C, NH3; (C) 600°C, N2; (D) 600°C, NH3; (E) 650°C, N2; and (F) 650°C, NH3. The EDS of heat-treated fibers at 550°C in NH3(G) show the composite fibers without calcination.

Hu et al. Nanoscale Research Letters 2013 8:548   doi:10.1186/1556-276X-8-548
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