Figure 2. Field-emission scanning electron micrographs and energy-dispersive X-ray spectra for (A1, A2, A3 and E) neat APP, (B1, B2, B3 and F) APP-1BL, (C1, C2, C3 and G) APP-2BL, (D1, D2, D3 and H) APP-3BL; elemental cartography micrograph of (I) APP-3BL. APP: Ammonium polyphosphate.
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