Development of an amperometric H2O2 sensor based on MOx/reduced graphene oxide nanocomposites

Pt-MOx/RGO composites (MOx = SnO
₂
, TiO
₂
) have been synthesized by a simple and fast non-aqueous sol-gel procedure assisted by microwave and characterized by SEM, TEM, XPS, XRD and FTIR spectroscopy. Screen-printed flexible sensors based on the composites synthesized have been applied for the amperometric detection of hydrogen peroxide (H
₂
O
₂
). The electrochemical characteristics of various Pt-MOx/RGO-modified screen printed electrodes were investigated and discussed. The developed sensor allowed the detection of H
₂
O
₂
, with a linear response from 0.1 to 20 mM of H
₂
O
₂
and a sensitivity of 40 μA mM
^-1
cm
^-2
, exhibiting furthermore good reproducibility and stability.