Heteropoly acids (HPAs) found wide applications, such as in catalysis, energy
conversion and storage, analytical chemistry, clinical medicine, materials
science and others, but because of their low surface area and high solubility
in water their use is limited. One of the possible ways to overcome these
obstacles is to use height specific surface area support for HPAs, such as
carbon nanomaterials. Raman spectroscopy was applied for studying study
interaction between HPAs and highly ordered pyrolytic graphite (HOPG) as a
model of a support. HOPG was exposed to two different HPAs:
12-tungstophosphoric acid and 12-molybodphosphoric acid, at different
concentrations. It was noticed that 12-molybodphosphoric acid has stronger
effects on HOPG structure causing a weak doping and increase of structural
disorder. It is supposed that HOPG interacts with especially external oxygen
atoms of 12-molybodphosphoric acid. Atomic force microscopy showed that
surface roughness of HOPG treated with 12-molybodphosphoric acid increases
with increase of acid concentration, while in the case of HOPG exposed to
12-tungstophosphoric acid the surface roughness is not concentration
dependent. The growth trend in measured surface roughness (RMS) is in the
agreement with the changes in the intensity ratio ID/IG obtained from Raman
spectra of HOPG samples treated with 12-molybdophosphoric acid. [Projekat
Ministarstva nauke Republike Srbije, br. 172003 i br. 172043]
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.