Specific features of the electronic structure and optical spectra of nanoparticles with strong electron correlations

Овчинников, С. Г.; Gizhevskiĭ, B. A.; Sukhorukov, Yu. P.; Ермаков, А. Е.; Уймин, М. А.; Козлов, Е. А.; Kotov, Ya. A.; Bagazeev, A. V.

doi:10.1134/s1063783407060169

Cited by 47 publications

(9 citation statements)

References 4 publications

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“…This result is consistent with [23,24,39,40]. Since higher annealing temperatures lead to the formation of new localized levels down conduction band and this ready to receive the electrons and generate tails levels of optical energy gap and the tails are working towards reducing the energy gap due to increased nanoparticles the size of the thin films (CuO) as a result of increasing the annealing temperature [39,41]. The CuO thin films show higher direct energy gap as compared to bulk value (1.3 -2.1),the blue shift in the direct band edges as seen in present case is due to the quantum confinement effect [23,39].…”

Section: ( 2)supporting

confidence: 87%

Annealing temperature effect on the Structure, Morphology and Optical properties of Copper Oxide CuO thin Films

Dahham¹

2023

Tikrit J. Pure Sci.

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Copper oxide (CuO) thin films were deposited on glass substrates by (sol-gel ) method using a spin -Coating technique and the speed of the spin coater was fixed at 3000 rpm for 30 sec and the samples were are annealed at temperatures (250,350,450 and 550) ° C for 1 hrs. The structural, Morphology, and optical properties of the film are determined by using X-ray diffraction (XRD), Atomic force microscopy (AFM) and UV-visible spectroscopy respectively. The XRD patterns showed that copper oxide (CuO) thin films prepared has polycrystalline structure and when increase the annealing temperature of the thin film over than 300° C the thin film turns from phase Cu2O to CuO phase and through examination (AFM) showed that the average grain size increases with the annealing temperature either Optical examinations showed decrease in transmission and increase in absorption coefficient with increase annealing temperature. The prepared thin films have direct energy gap and the value of the optical energy gap decreased with increasing annealing temperature from 3.99 eV to 3.94 eV

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Section: ( 2)supporting

confidence: 87%

Annealing temperature effect on the Structure, Morphology and Optical properties of Copper Oxide CuO thin Films

Dahham¹

2023

Tikrit J. Pure Sci.

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“…The indirect band gap of CuO nanoparticles synthesized using both the solvents show similar values and the values red shifted ~ 0.24 to 0.27 eV as compared to bulk value (1.45 eV) [21]. The increasing red shift with decreasing particle size suggests that the defects responsible for the intra-gap states are primarily of surface defects [22][23][24]. Our results thus indicated that CuO nanoparticles prepared using ethanol as solvent show more surface defects as compared to the CuO nanoparticles prepared using propanol as solvent.…”

Section: Uv-visible Characterization Of Cuo Nanoparticlementioning

confidence: 78%

Structure, Microstructure and Optical Absorption Analysis of CuO Nanoparticles Synthesized by Sol-Gel Route

Mallick¹,

Sahu²

2012

109

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We report the synthesis of CuO nanoparticles using different solvents by a low cost sol-gel route. Evolution of structure, microstructure and optical absorption analysis of these nanoparticles were studied using X-ray diffraction (XRD) and UV-Visible spectrophotometer. XRD analysis indicated that the crystallite size and strain are higher for the CuO nanoparticle synthesized using propanol as solvent. Optical absorption analysis indicated the red shift of indirect band gap and the blue shift of direct band gap. In the present case, red shift is associated with the formation of surface defects whereas the blue shift is due to the quantum confinement effect seen for nanoparticle systems.

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“…With decreasing particle size, a strong hybridization of the s-p states of the CuO host and the d states of the La impurity is likely to occur [22]. The increasing red shift with decreasing particle size suggests that the defects responsible for the intra gap states are primarily surface defect [25]. The La doped CuO is highly effective and can significantly enhance the photo catalytic degradation.…”

Section: A Determination Of Band Gap Energy From Uv Absorption Spectramentioning

confidence: 99%

Characterisation and Optical Studies of Copper Oxide Nanostructures Doped with Lanthanum Ions

Varughese¹,

Rini²,

Suraj³

et al. 2014

Advances in Materials Science

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Copper Oxide is an extensively studied group II-VI semiconductor with optical properties. It exhibits a wide variety of morphologies in the nano regime that can be grown by tuning the growth habit of the CuO crystal. CuO nano materials with an average particle size of 15-27 nm are synthesized by chemical route. XRD, SEM, FTIR UV-Vis and EDS characterize the samples. The percentage of doping material is confirmed from the EDS spectra. The average crystal size of the prepared CuO: La nanopowder is determined by XRD. The UV absorption spectra revealed the absorption edge at wavelength 389 nm indicating the smaller size of CuO:La nano particle. The optical direct band gap energy of doped CuO nanoparticle is found to be in the range 3.149 eV. The increasing red shift with decreasing particle size suggests that the defects responsible for the intra gap states are primarily surface defect. The La doped CuO is highly effective and can significantly enhance the photo catalytic degradation.

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Specific features of the electronic structure and optical spectra of nanoparticles with strong electron correlations

Cited by 47 publications

References 4 publications

Annealing temperature effect on the Structure, Morphology and Optical properties of Copper Oxide CuO thin Films

Annealing temperature effect on the Structure, Morphology and Optical properties of Copper Oxide CuO thin Films

Structure, Microstructure and Optical Absorption Analysis of CuO Nanoparticles Synthesized by Sol-Gel Route

Characterisation and Optical Studies of Copper Oxide Nanostructures Doped with Lanthanum Ions

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