Abstract
We report a facile chemical treatment process for the fabrication of hierarchical bismuth ferrite (BiFeO3/BFO) nanostructures. Using this approach, we have fabricated BFO flakes, flowers, petals and garlands like structures by reconstructing the surface of BFO nano-particulates and fibers, respectively. The kinetic studies on the developed process reveal that the surface reconstruction process is the fundamental mechanism for the hierarchical growth of the BFO nanostructures. It is also found that this surface reconstruction process scarcely influences the surface chemical composition of BFO nanostructures. The optical absorption studies showed that the band gap energy of BFO can be tailored by tuning their hierarchical structures. This process can be universal as it can transform any structures into their hierarchical nanostructures.
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