This study demonstrates how crucial interphase engineering is for maximising the transfer of filler properties in epoxy nanocomposites, and that the chemical interaction between filler and matrix is key in determining dispersed filler distribution and morphology. However, the problem of different material functions requiring different functionalisation strategies remains. Overcoming this to produce polymer nanocomposites with multiple high performance functions, is likely to require hybrid filler combinations, with optimised loading, dimensionality, and surface chemistry. GNP Fluorine functionalised (gas).