High-fluorescent p-X-ferrites (XFeO; XFO; X = Fe, Cr, Mn, Co, or Ni) embedded in n-hematite (FeO) surfaces were successfully fabricated via a facile bio-approach using Shewanella oneidensis MR-1. The results revealed that the X ions with high/low work functions modify the unpaired spin Fe-O orbitals in the XFeO lattices to become localized paired spin orbitals at the bottom of conduction band, separating the photovoltage response signals (73.36~455.16/-72.63~-32.43 meV). These (FeO)-O-O-(XFeO) interfacial coupling behaviors at two fluorescence emission peaks (785/795 nm) are explained via calculating electron-hole effective masses (FeO-FeFeO 17.23 × 10 kg; FeO-CoFeO 3.93 × 10 kg; FeO-NiFeO 11.59 × 10 kg; FeO-CrFeO -4.2 × 10 kg; FeO-MnFeO -11.73 × 10 kg). Such a system could open up a new idea in the design of photovoltage response biosensors.
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| http://dx.doi.org/10.1186/s11671-017-1885-3 | DOI Listing |
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