fig5
![Mechanically flexible and flame-retardant cellulose nanofibril-based films integrated with MXene and chitosan](https://image.oaes.cc/a06da802-6d46-445d-ad73-c6738fa51c17/5292.fig.5.jpg)
Figure 5. Structural evaluation of composite films after burning. (A) Digital photographs of PCNF/CS15-M5.0 film before/after being exposed to butane flame. Cross-sectional SEM images of (B) PCNF/CS15-M5.0 and (C) PCNF films after flame attack. (D) C1s, (E) P2p and (F) Ti2p XPS spectra of PCNF/CS15-M5.0 film after burning.