*2.14.3 Thermal stability*

When graphene/polymer nanocomposites are prepared through the solvent method, a well-dispersed system is created maximizing the graphene surface area, which will contribute to superb material thermal stability [112, 113]. Covalent modifications can be used to improve the graphene dispersion and distribution into the polymer matrix to attain the most significant effect. The modification could also change the microstructure of graphene, resulting in graphene with a high carbon-tooxygen atom ratio (C/O ratio). This may increase thermal stability, through a decrease in the oxygen functional group content and an increase in the C/O ratio as shown in **Figure 8** and **Table 2** [115, 116]. In general, a tiny loaded amount of graphene can notably enhance the thermal stability of polymer materials [117, 118].
