Crystalline hematite/polycrystalline nickel oxide (α-Fe2O3/NiO) core/shell nanofibers are prepared by electrospinning and calcination, followed by a varying number (100-1150) of atomic layer deposition cycles of NiO. The deposition of the conformal NiO layer leads to the passivation of the surface states and the appearance of a photoluminescence band in the micro-Raman spectra excited by 532 nm laser. As a continuous NiO layer is formed, a peak, possibly arising from a two-magnon mode, appears at 1585 cm−1. The detection of the peak, which is not observed in the spectra excited by a 633 nm laser, is assisted by the surface plasmon at around 510 nm introduced by the polycrystalline NiO layer, due to the electron doping induced by coordination-defects at its edge-rich surface.

On the plasmon-assisted detection of a 1585 cm−1 mode in the 532 nm Raman spectra of crystalline α-Fe2O3/polycrystalline NiO core/shell nanofibers

Patane S.
Ultimo
2021-01-01

Abstract

Crystalline hematite/polycrystalline nickel oxide (α-Fe2O3/NiO) core/shell nanofibers are prepared by electrospinning and calcination, followed by a varying number (100-1150) of atomic layer deposition cycles of NiO. The deposition of the conformal NiO layer leads to the passivation of the surface states and the appearance of a photoluminescence band in the micro-Raman spectra excited by 532 nm laser. As a continuous NiO layer is formed, a peak, possibly arising from a two-magnon mode, appears at 1585 cm−1. The detection of the peak, which is not observed in the spectra excited by a 633 nm laser, is assisted by the surface plasmon at around 510 nm introduced by the polycrystalline NiO layer, due to the electron doping induced by coordination-defects at its edge-rich surface.
2021
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/3205707
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