Crystalline hematite/polycrystalline nickel oxide (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 / Santangelo, S; M. H., Raza; N., Pinna; S., Patanè. - In: APPLIED PHYSICS LETTERS. - ISSN 1077-3118. - 118:25(2021), p. 251105. [10.1063/5.0050873]
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
Santangelo S
Conceptualization
;
2021-01-01
Abstract
Crystalline hematite/polycrystalline nickel oxide (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.File | Dimensione | Formato | |
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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.pdf
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