Size-controlled synthesis of BiFeO3 nanoparticles by a facile and stable sol–gel method
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Bismuth ferrite (BiFeO3) acting as a significant multiferroic material exhibits unique magnetic and ferroelectric properties. Here we report the size-controlled synthesis of BiFeO3 nanoparticles via a facile and stable Pechini sol–gel method, in which uses tartaric acid as a complexing agent, ethylene glycol as a polymerizing agent. It is found that the nanoparticle size is sensitive to the gel-forming temperature. The nanoparticles with size as small as 30 nm have been obtained. A sequential reaction process and the mechanism of size controllable growth of BiFeO3 has been presented. The effects of size on optical and magnetic properties have been also investigated. The decreasing particles lead to blue shift in the band gap. BiFeO3 nanoparticles show weak ferromagnetic character due to a Fe3+ oxidation state, and the magnetization increases with decrease in the particle size.
KeywordsBiFeO3 Tartaric Acid Multiferroic Material BiFeO3 Nanoparticles Visible Reflectance Spectrum
This work is supported by the Natural Science Foundation of China (Nos. 11474199 and 51332009). School of Materials Science and Engineering, Shanghai Jiaotong University and National Engineering Research Center for Nanotechnology are gratefully acknowledged for assisting relevant analyses.