Optical absorption spectra of nanocrystalline cupric oxide: possible effects of nanoscopic phase separation

Gizhevskiĭ, B. A.; Sukhorukov, Yu. P.; Loshkareva, N. N.; Moskvin, A. S.; Zenkov, E. V.; Козлов, Е. А.

doi:10.1088/0953-8984/17/3/009

Cited by 10 publications

(5 citation statements)

References 12 publications

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“…There have been many theoretical [12,24,[36][37][38][39][40][41] and experimental studies [10,23,25,27,[42][43][44] of CuO. The purpose of this paper is to present optical properties of CuO based on the modern electronic structure that yield electronic properties of the strongly correlated systems in agreement with experiments, [12,13,36] in contrast to standard density functionals.…”

Section: Introductionmentioning

confidence: 80%

Electronic structure and spectra of CuO

et al. 2014

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We report the electronic structure of monoclinic CuO as obtained from first principles calculations utilizing density functional theory plus effective Coulomb interaction (DFT + U) method. In contrast to standard DFT calculations taking into account electronic correlations in DFT + U gave antiferromagnetic insulator with energy gap and magnetic moment values in good agreement with experimental data. The electronic states around the Fermi level are formed by partially filled Cu 3d x 2 −y 2 orbitals with significant admixture of O 2p states. Theoretical spectra are calculated using DFT + U electronic structure method and their comparison with experimental photoemission and optical spectra show very good agreement.

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Section: Introductionmentioning

confidence: 80%

Electronic structure and spectra of CuO

et al. 2014

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“…Compared with their bulk counterpart, nanowires could also exhibit different optical properties due to the effects from their large specific surface area. 23 Figure 3 shows the result of enhanced field emission from CuO nanowire films by 532 nm laser irradiation. Figure 2 shows the optical absorption spectrum of as-grown CuO nanowires in absolute ethanol after correcting for background contribution from the solution.…”

Section: Resultsmentioning

confidence: 99%

Enhanced field emission from CuO nanowire arrays by in situ laser irradiation

Zhu

Sow

Thong

2007

Journal of Applied Physics

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Laser irradiation was found to effectively enhance the field emission current of CuO nanowire arrays. The effects of laser intensity, wavelength, emission current, and working vacuum on the enhancement have been investigated in detail. The observed laser induced enhancement in field emission current is attributed to the interplay of two factors, namely, laser induced electron transition to excited states and surface oxygen desorption. Among these factors, the contribution from extra excited electrons, which increases the number of electrons in conduction band of CuO for subsequent tunneling, is dominant. A physical process of the laser induced enhancement is discussed. This work helps to elucidate the mechanisms of electron field emission from narrow band gap nanowires and will be useful for designing future vacuum nanodevices, such as photodetectors or switches, based on field emission of nanowires.

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“…Actually, some of the nanostructured CuO samples manifest resonances near 1.3-1.5 eV. Effective medium theory was shown to provide the reasonable description of experimental spectra in terms of the plasmon features due to the metallic droplets [4]. Annealing at 900ºC in air returns the CuO nanoceramics to the equilibrium state.…”

Section: Resultsmentioning

confidence: 97%

Features of Optical Properties and the Electronic Structure of Nanostructured Oxides of 3d-Metals

Gizhevskiĭ

Sukhorukov

Nomerovannaya

et al. 2010

SSP

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Features of the optical properties of nanostructured strongly correlated oxides CuO, Y3Fe5O12, and FeBO3 in a wide range of energies, which includes both the fundamental absorption region, low-energy electron excitations, and phonon modes have been investigated by methods of optical spectroscopy. Absorption and reflection spectra, Raman spectra, and ellipsometry measurements are carried out on the samples of oxide nanostructured ceramics. High-density nanoceramics were prepared by shock-wave loading and high pressure torsion methods from coarse-grain oxide powders. Strong smearing of the fundamental absorption edge is revealed for all nanoceramics. Anomalous red shift of the absorption edge Eg is found in CuO nanooxide. The features of the optical functions in nanooxides of 3d-metals may be attributed to high defectiveness of nanooxides, peculiarities in the electronic structure of strongly correlated oxides and their tendency to electronic phase separation.

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Optical absorption spectra of nanocrystalline cupric oxide: possible effects of nanoscopic phase separation

Cited by 10 publications

References 12 publications

Electronic structure and spectra of CuO

Electronic structure and spectra of CuO

Enhanced field emission from CuO nanowire arrays by in situ laser irradiation

Features of Optical Properties and the Electronic Structure of Nanostructured Oxides of 3d-Metals

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