Effect of graphene flake size on functionalisation: quantifying reaction extent and imaging locus with single Pt atom tags.

ABSTRACT: Here, the locus of functionalisation on graphene-related materials and the progress of the reaction is shown to depend strongly on the starting feedstock. Five characteristically different graphite sources were exfoliated and functionalized using a non-destructive chemical reduction method. These archetypical examples were compared via a model reaction, grafting dodecyl addends, evaluated with TGA-MS, XPS and Raman data. A general increase in grafting ratio (ranging from 1.1 wt% up to 25 wt%) and an improvement in grafting stoichiometry (C/R) were observed as flake radius decreased. Raman spectrum imaging of the functionalised natural flake graphite identified that grafting is directed towards flake edges. This behaviour was further corroborated, at atomistic resolution, by function

SUBMITTER: Rubio N 

PROVIDER: S-EPMC8597866 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature