Manipulation of the magnetoabsorption effect in Co-coated ZnO nanowires with Au decoration

Hsu, Hua-Shu; Hsu, Huai Sheng; Lin, Jun; Sun, Shih-Jye; Tseng, Yaw‐Teng; Remeš, Z.

doi:10.1016/j.apsusc.2019.06.225

Cited by 3 publications

(6 citation statements)

References 49 publications

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“…This behavior is consistent with our magneto-PD results for the bare ZnO NWs with low spin polarization, which did not exhibit noticeable magneto-PD effects under the relatively low magnetic field of 0.15 T. The Co 2+ /ZnO NWs with high spin polarization under B = 0.15 T actually generated more photoinduced spin-polarized electrons, thereby reducing the recombination of active species (free radicals) during the surface reaction process and enhancing the surface reactions of degradation . Furthermore, to determine the effects of a magnetic field on the Co 2+ /ZnO NW photoelectrodes, we employed a spin-polarized semiconductor band to induce sizable magneto-optical harvesting in our previous work . As presented in SI S8, the Co 2+ /ZnO NWs exhibited a positive magneto-OA effect, indicating that the enhancement in light harvesting through an applied magnetic field can enhance PD.…”

Section: Results and Discussionsupporting

confidence: 86%

“…15 Furthermore, to determine the effects of a magnetic field on the Co 2+ /ZnO NW photoelectrodes, we employed a spinpolarized semiconductor band to induce sizable magnetooptical harvesting in our previous work. 27 As presented in SI S8, the Co 2+ /ZnO NWs exhibited a positive magneto-OA effect, indicating that the enhancement in light harvesting through an applied magnetic field can enhance PD.…”

Section: Enhancement Of Spin Polarization Near the Fermi Level In Co ...mentioning

confidence: 80%

“…The positive magneto-PD effect may also be associated with a variation in the Co DOS caused by the magnetic field near the ZnO Fermi level. Accordingly, MCD spectra, which describe the OA difference between left and right circularly polarized light under an applied magnetic field (SI S6), have been used to examine the spin-dependent DOS and the accompanied spatial spin and carrier polarizations near the Fermi level. − Figure a displays the MCD spectra of the bare ZnO NWs and the Co 2+ /ZnO NWs. The MCD signals of the Co 2+ /ZnO NWs are broader than those of the bare ZnO NWs, which is consistent with our OA results (Figure a).…”

Section: Results and Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Enhanced Photodegradation in Metal Oxide Nanowires with Co-Doped Surfaces under a Low Magnetic Field

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Thaomonpun

Thongpool

et al. 2021

ACS Appl. Mater. Interfaces

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This work demonstrated the enhanced photodegradation (PD) resulting from Co-rich doping of ZnO nanowire (NW) surfaces (Co2+/ZnO NWs) prepared by combining Co sputtering on ZnO NWs and immersion in deionized water to exploit the hydrophilic–hydrophobic transitions on the ZnO surfaces resulting from Co atom diffusion. Because of the controllable spin-dependent density of states (DOS) induced by Co2+, the PD of methylene blue dye can be enhanced by approximately 90% (when compared with bare ZnO NWs) by using a conventional permanent magnet with a relatively low magnetic field strength of approximately 0.15 T. The reliability of spin polarization–modulation attained through surface doping, based on the magnetic response observed from X-ray absorption measurements and magnetic circular dichroism, provides an opportunity to create highly efficient catalysts by engineering surfaces and tailoring their spin-dependent DOS.

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Section: Results and Discussionsupporting

confidence: 86%

Section: Enhancement Of Spin Polarization Near the Fermi Level In Co ...mentioning

confidence: 80%

Section: Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced Photodegradation in Metal Oxide Nanowires with Co-Doped Surfaces under a Low Magnetic Field

Lin

Thaomonpun

Thongpool

et al. 2021

ACS Appl. Mater. Interfaces

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“…When the Co/ZnO NWs initially made contact with the NM, changes in the MCD spectra were discernible. The MCD spectrum is sensitive to unoccupied spin-dependent DOSs. , These changes could have been anticipated by redistributing the electrons in the band structure of the Co/ZnO NWs.…”

Section: Resultsmentioning

confidence: 99%

Field-Free Magnetoplasmon-Induced Ultraviolet Circular Dichroism Switching in Premagnetized Magnetic Nanowires

Lin

Chen

Sun

et al. 2022

ACS Appl. Mater. Interfaces

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Broadband modulation of magnetic circular dichroism (MCD) using a relatively low magnetic field or by producing a field-free magnetoplasmonic effect in the remnant magnetic state was achieved by the integration of the noble metals (NMs) Au and Ag and the perpendicular magnetic anisotropy of Co with ZnO nanowires (NWs) used as the template. The samples containing NMs revealed MCD sign reversals and enhancements when compared with the original Co/ZnO NWs. The magnetoplasmonic effect of Au close to the visible light spectrum could induce the CD change in the visible region. Notably, the ultraviolet (UV) CD in Ag/Co/ZnO NWs is 12.5 times larger under a magnetic field (∼0.2 T) and 10 times greater in the remnant state (field-free) than those of the original Co/ZnO NWs because of the magnetoplasmonic effect of Ag in the UV spectrum. These results are attributable to the coupling of the remnant magnetic state of Co magnetization, the magnetoplasmons of the NMs, and the excitons of the ZnO NWs. The findings are potentially applicable in magneto-optical recording, biosensing, and energy contexts involving magnetoplasmonic functionalization.

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“…A promising alternative to engineer spin‐polarized DOSs relies on the charge transfer between charge reservoirs and suppliers in many vacancy‐rich oxide nanostructures with a high unoccupied DOSs through Stoner excitation. [ 21–23 ] Engineering spin‐polarized band introduces directly magnetic field to dynamic control the magneto‐optical absorption (MOA) and associated magneto‐photocurrent (MPC), highlighting their exploration for magnetic‐field‐manipulations on energy‐involved applications and photonics devices, which allows photosensitive semiconductor material to greatly enhance the range of applicability.…”

Section: Introductionmentioning

confidence: 99%

Manipulated Optical Absorption and Accompanied Photocurrent Using Magnetic Field in Charger Transfer Engineered C/ZnO Nanowires

et al. 2020

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The rarely explored, spin‐polarized band engineering, enables direct dynamic control of the magneto‐optical absorption (MOA) and associated magneto‐photocurrent (MPC) by a magnetic field, greatly enhancing the range of applicability of photosensitive semiconductor materials. It is demonstrated that large negative and positive MOA and MPC effects can be tuned alternately in amorphous carbon (a‐C)/ZnO nanowires by controlling the sp2/sp3 ratio of a‐C. A sizeable enhancement of the MPC ratio (≈15%) appears at a relatively low magnetic field (≈0.2 T). Simulated two peaks spin‐polarized density of states is applied to explain that the alternate sign switching of the MOA is mainly related to the charge transfer between ZnO and C. The results indicate that the enhanced magnetic field performance of (a‐C)/ZnO nanowires may have applications in renewable energy‐related fields and tunable magneto‐photonics.

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Manipulation of the magnetoabsorption effect in Co-coated ZnO nanowires with Au decoration

Cited by 3 publications

References 49 publications

Enhanced Photodegradation in Metal Oxide Nanowires with Co-Doped Surfaces under a Low Magnetic Field

Enhanced Photodegradation in Metal Oxide Nanowires with Co-Doped Surfaces under a Low Magnetic Field

Field-Free Magnetoplasmon-Induced Ultraviolet Circular Dichroism Switching in Premagnetized Magnetic Nanowires

Manipulated Optical Absorption and Accompanied Photocurrent Using Magnetic Field in Charger Transfer Engineered C/ZnO Nanowires

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