Abstract
We report a tunable band gap of bismuth ferrite–polyaniline core–shell nanoparticles from 2.24 to 1.98 eV and the variation of coercivity from 118 to 100 Oe, by varying the thickness of the polyaniline shell.
Highlights
Bismuth ferrite, BiFeO3 (BFO) is a widely investigated multiferroic material which has a very high ferroelectric Curie temperature (TC $ 1100 K) and antiferromagnetic Neel temperature (TN $ 643 K)
In this work we demonstrate that polyaniline (PANI) coating thickness can in uence the optical band gap of BFO nanoparticles
It was found that the BFO nanoparticles as well as BP nanoparticles are in the rhombohedral structure and data is in good in agreement with JCPDS Card no. 01-072-7678 and is in agreement with previously reported BFO nanoparticles.[3,13,14]
Summary
BiFeO3 (BFO) is a widely investigated multiferroic material which has a very high ferroelectric Curie temperature (TC $ 1100 K) and antiferromagnetic Neel temperature (TN $ 643 K). In the nano size regime BFO particles inherently assume a core–shell structure in which the core is antiferromagnetic and the shell is ferromagnetic. The ferromagnetic shell thickness increases with decreasing particle size.[1] Additional coatings like silica, polyaniline and NiFe2O4 showed remarkable changes in the magnetic properties of the BFO nanoparticles.[2,3,4] Liu et al have very recently reported controllable synthesis and enhanced photocatalytic activity of BFO–C core–shell nano bres and showed that introduction of carbon should enhance the light absorption of BFO nanoparticles and adsorption capacity of methyl orange and facilitate the separation of photo-generated electron–hole pair, both of which result in enhanced photocatalytic activity of BFO nano bers.[5] by coating the BFO nanoparticles it is possible to in uence its properties. We achieve a variation in the band gap of BFO from 2.24 eV to 1.98 eV and changes in the coercivity from $118 to $100 Oe by increasing the polyaniline shell thickness from 0 nm to 15 nm
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