Аннотация
The surface microchemical environment of graphene oxide (GO) has so far
been oversimplified for understanding practical purposes. The amount as
well as the accurate identification of each possible oxygenated group on
the GO surface are difficult to describe not only due to the complex
chemical nature of the oxidation reactions but also due to several
intrinsic variables related to the production and chemical processing of
GO-based materials. However, to advance toward a more realistic
description of the GO chemical environment, it is necessary to
distinguish the oxygenated fragments with very peculiar characteristics
that have so far been treated as simply graphene oxide.. In this way,
small oxidized graphitic fragments adsorbed on the GO surface, named
oxidation debris or carboxylated carbonaceous fragments (CCFs), have
been here separated from commercially available GO. Spectroscopy and
microscopy results indicated that the chemical nature of these fragments
is different from that of GO. By using the decoration of GO with silver
nanoparticles as a conceptual model, it was seen that the presence of
oxidation debris on the GO surface greatly influences the associated
kinetic processes, mainly due to the nucleation and stabilization
capacity for silver nanoparticles provided by the oxidation debris
fragments. Consequently, when CCFs are present, Ag nanoparticles are
significantly smaller and less crystalline. Considering the GO
microchemical environment pointed out here, these findings can be
qualitatively extrapolated to all other covalent and noncovalent
functionalizations of GO.
Пользователи данного ресурса
Пожалуйста,
войдите в систему, чтобы принять участие в дискуссии (добавить собственные рецензию, или комментарий)