Mechanism of Fluorescence Enhancement of Biosynthesized XFe^sub 2^O^sub 4^-BiFeO3 (X = Cr, Mn, Co, or Ni) Membranes

• Published in: Nanoscale research letters 2016-12, Vol.11 (1), p.1
• Main Authors: Bian, Liang, Li, Hai-long, Dong, Hai-liang, Dong, Fa-qin, Song, Mian-xin, Wang, Li-sheng, Hou, Wen-ping, Gao, Lei, Zhang, Xiao-yan, Zhou, Tian-liang, Sun, Guang-ai, Li, Xin-xi, Xie, Lei
• Format: Article
• Language: English
• ISSN: 1931-7573; 1556-276X
• DOI: 10.1186/s11671-016-1747-4

Ferrites-bismuth ferrite is an intriguing option for medical diagnostic imaging device due to its magnetoelectric and enhanced near-infrared fluorescent properties. However, the embedded XFO nanoparticles are randomly located on the BFO membranes, making implementation in devices difficult. To overcome this, we present a facile bio-approach to produce XFe2O4-BiFeO3 (XFO-BFO) (X = Cr, Mn, Co, or Ni) membranes using Shewanella oneidensis MR-1. The perovskite BFO enhances the fluorescence intensity (at 660 and 832 nm) and surface potential difference (-469~385 meV and -80~525 meV) of the embedded spinel XFO. This mechanism is attributed to the interfacial coupling of the X-Fe (e- or h+) and O-O (h+) interfaces. Such a system could open up new ideas in the design of environmentally friendly fluorescent membranes.