Figure 3. (A) EDS; (B) FTIR; (C) XRD; (D) TGA of APP and APP@PEI@SiO2@MXene. EDS: Energy-dispersive X-ray spectroscopy; FTIR: Fourier-transform infrared spectroscopy; XRD: X-ray diffraction; TGA: thermogravimetric analysis; APP: ammonium polyphosphate; PEI: polyethyleneimine.
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