Nanocrystalline copper oxide for selective solar energy absorbers

Sukhorukov, Yu. P.; Gizhevskiĭ, B. A.; Mostovshchikova, E. V.; Yermakov, A. Ye.; Tugushev, S. N.; Козлов, Е. А.

doi:10.1134/s1063785006020131

Cited by 29 publications

(13 citation statements)

References 6 publications

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“…Interestingly, this unusually small optical gap was also reported elsewhere for CuO nanopowers and nanoceramics 10-20 nm in size, the energy gap of which is red-shifted down to 0.6 eV. [17] Figure 4c shows a scanning electron microscopy image of the e-beam patterned cross-point structure of the CuO/IZO thin-film diode. Pt bottom electrodes were formed by e-beam lithography so that four contact pads are connected to the two vertical Pt lines shown in Figure 4c.…”

Section: à2mentioning

confidence: 51%

High‐Current‐Density CuO _x/InZnO_x Thin‐Film Diodes for Cross‐Point Memory Applications

et al. 2008

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Section: à2mentioning

confidence: 51%

High‐Current‐Density CuO _x/InZnO_x Thin‐Film Diodes for Cross‐Point Memory Applications

et al. 2008

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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: 77%

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

Mallick¹,

Sahu²

2012

106

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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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“…The abnormal red shift of the fundamental absorption edge of strongly correlated nanocrystalline n-CuO oxide may be interpreted as the consequence of high n-CuO imperfection, electron structure of strongly correlated compounds based on 3d metals, and their liability to electron phase delamination with the formation of metallic inclusions. Nanocrystalline n-CuO and n-Cu 2 O powders were obtained in the form of nanoceramics and nanopowders in [13]. High-dense (~99% of the theoretical value) n-CuO ceramics were obtained in spherically convergent shock waves incident on polycrystalline CuO with micron grains.…”

Section: Introductionmentioning

confidence: 99%

“…The papers [10][11][12][13][14][15][16] examined the impact of shock waves and He + ions on CuO. The paper [10] used x-ray photoelectron spectroscopy and x-ray emission spectroscopy to examine the valence state of copper ions and phase composition of CuO exposed to He + ions and explosive shock waves.…”

Section: Introductionmentioning

confidence: 99%

Structural and phase changes in copper, cobalt, and titanium oxide powders subjected to shock waves

Kovtun

Karpets

Гарбуз

et al. 2008

Powder Metall Met Ceram

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Powders TiO 2 , CuO, Cu 2 O, and CoO mixed with inert filler are subjected to shock waves in cylindrical preservation devices. The shock waves are generated by the explosion of TG40 charge at a detonation speed of 7.8 km/sec and detonation wave pressure of 28 GPa. It is established that shock-wave processing of oxide powders leads to changes in particle-size distribution since coarse and medium particles are crushed, coherent scattering regions become smaller, and concentration of phase distortions increases. Phase transformation of rutile into denser orthorhombic modification occurs in TiO 2 , and the content of phases with higher oxygen amount increases in Cu 2 O and CoO. INTRODUCTIONThe effect of shock waves on some oxides is examined in [1][2][3][4][5][6][7][8][9][10][11][12]. The paper [1] provides data on the effect of shock compression on the catalytic properties of semiconductor oxide catalysts TiO 2 , BaTiO 3 , ZnO, and NiO.According to x-ray diffraction of samples, the half-width and intensity of diffraction lines change after compression, which is evidence of phase distortions. The lattice parameters do not change and new phases are not formed.The paper [2] examines the dynamic loading of mono-and polycrystalline samples of rutile TiO 2 . It is shown that loading leads to the polymorphous transformation of rutile into a denser phase. Examining the shock compression of dense and porous rutile in [3-6] also revealed the formation of dense TiO 2 modification. Note that it is concluded in [6] that no chemical transformations (for example, decomposition) occur as a result of shock compression based on curves from differential thermal and particle-size distribution analyses of the initial and preserved TiO 2 and MnO 2 samples plotted from 20 to 1000°C at a rate of 7 °C/min. Changes in the actual and atomic structures of the substances in shock waves and their chemical transformations are considered in [7]. A mechanism of the dispersion of powder particles in shock wave is proposed. It is shown that a certain ratio exists between the crystalline size and shock front depth.The papers [10-16] examined the impact of shock waves and He + ions on CuO. The paper [10] used x-ray photoelectron spectroscopy and x-ray emission spectroscopy to examine the valence state of copper ions and phase composition of CuO exposed to He + ions and explosive shock waves.The paper [11] examined the magnetic properties of two types of nanocrystalline samples of CuO (dense nanoceramics and loose powders). A decrease in particle sizes increases the χ sensitivity at lower temperature. Elastic stresses resulting from external impact are the main contributors to the magnetic properties of nanoceramics. The relaxation of elastic stresses restores the magnetic order and decreases the sensitivity.The paper [12] examined the abnormities of the optical properties of nanocrystalline CuO and Cu 2 O obtained in spherically convergent shock waves. The optical absorption spectra of nanocrystalline n-CuO show, on the background of extensive tailing,...

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Nanocrystalline copper oxide for selective solar energy absorbers

Cited by 29 publications

References 6 publications

High‐Current‐Density CuO _x/InZnO_x Thin‐Film Diodes for Cross‐Point Memory Applications

High‐Current‐Density CuO _x/InZnO_x Thin‐Film Diodes for Cross‐Point Memory Applications

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

Structural and phase changes in copper, cobalt, and titanium oxide powders subjected to shock waves

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Nanocrystalline copper oxide for selective solar energy absorbers

Cited by 29 publications

References 6 publications

High‐Current‐Density CuO x/InZnOx Thin‐Film Diodes for Cross‐Point Memory Applications

High‐Current‐Density CuO x/InZnOx Thin‐Film Diodes for Cross‐Point Memory Applications

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

Structural and phase changes in copper, cobalt, and titanium oxide powders subjected to shock waves

Contact Info

Product

Resources

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High‐Current‐Density CuO _x/InZnO_x Thin‐Film Diodes for Cross‐Point Memory Applications

High‐Current‐Density CuO _x/InZnO_x Thin‐Film Diodes for Cross‐Point Memory Applications