Modification of surface chemistry by lattice Sn doping in BiFeO ₃ nanofibers

Abstract

Results on X-ray near edge structure (XANES) study on Sn-doped BiFeO3 (BFO) nanofibers with varying Sn concentrations of 1%, 3%, and 5% are reported. The results indicate that the oxidation state of Sn ions in the BFO structure is +4. In addition, we observe a bismuth peak (Bi M1) at 4000 eV in the XANES spectrum, suggesting the diffusion of Bi ions onto the surface of BFO nanostructure. The diffusion is attributed to the charge compensation between donor electrons from the Sn atoms and Bi vacancies. These findings are of high relevance to surface chemistry reactions in sensing and catalytic applications.

The Gadolinium (Gd3+) and Tin (Sn4+) Co-doped BiFeO3 Nanoparticles as New Solar Light Active Photocatalyst

“…It has been reported that the doping of Gd 3+ at A-site onto BFO shows enhanced photocatalytic degradation of Rhodamine B due to ferromagnetic behavior 43 . Additionally, the effects of Sn 4+ doping on the morphology and electromagnetic properties of BFO have been studied 44 45 .…”

Congo Red Dye Degradation by Graphene Nanoplatelets/Doped Bismuth Ferrite Nanoparticle Hybrid Catalysts under Dark and Light Conditions

“…Figure 9 illustrates the basic mechanism of dye degradation under visible light, as well as in the dark (absence of light). In the presence of light, electrons travels to the conduction band of BGFSO nanoparticles, from the valence band and the donor shallow energy levels, created below the bottom of conduction band due to the doping of Sn [10]. GNPs lower the recombination rate of electron-hole charge carriers by acting as trapping site of electron [14].…”

“…Perovskite structures have gained great attention, due to their fascinating physical characteristics, and initiated many useful applications in different technological areas [7][8][9]. Perovskites are materials having chemical formula ABO 3 [10] where, A is usually a bigger cation than B cation and O is oxygen (anionic specie). The key features of perovskite materials include simple and easy fabrication, huge solar adsorption, less non-radiative charge carrier recombination, high mobility of carriers for cell architectures and capitalization of dye sensitized photovoltaic cells [9].…”

“…Based on published reports, rare-earth metal doping, inside BFO, improved its physical and chemical properties drastically [16][17][18][19]23,31]. The doping of Sn on B site of BFO has shown a good tuned structure for catalytic and sensing applications [10]. The substitution of Gd on the A site of BFO has shown enhanced ferromagnetism and visible light catalytic effects with improved surface chemistry [21,22].…”

Enhanced magnetic properties of cobalt-doped bismuth ferrite nanofibers

“…However, the poor magnetization performance of bulk BFO limits its practical applications [8,9], As is known to all, the lone electron pairs of Bi 3+ lead to the ferroelectric properties of BFO, whereas G-type antiferromagnetic is the result of the ordering of Fe 3+ spins with a complicated long-period modulation about 62 nm [10,11]. Therefore, the ferromagnetism can be enhanced by destroying the spiral spin structure.…”