In this work, the response of humidity sensing and dielectric properties of PANI/Ag/graphene/BaFe12O19
(PAGB) composite prepared by chemical interfacial oxidative polymerization method using the
ammonium peroxydisulfate as an oxidant is presented. The synthesized PAGB composite was
characterized by using FT-IR, XRD, SEM and EDAX techniques. The measured dielectric constant
and dielectric tangent loss values were found to decrease with increase in logarithmic frequency. The
electrical resistance of the composite was also found to decrease from 2500 MΩ to 7 MΩ, on exposure
to a wide range of relative humidity (RH) varying between 10% and 97% RH. This observed decrease
is due to capillary condensation of water molecules which cause the changes in electrical conductivity
of composite. The synthesized PAGB-50% composite displayed a high sensitivity at low humidity
ranging from 20% to 60% RH. The composite has been proved to be a better candidate in the design
of humidity sensors. In addition, PAGB composite exhibited efficiency towards the degradation of
organic anionic dye, acid orange-8, with high potential of reusability.
A Fast, Highly Efficient, and Green Protocol for Synthesis of Biscoumarins Catalyzed by Silica Sulfuric Acid Nanoparticles as a Reusable Catalyst