X-ray photoelectron spectroscopy of copper compounds

Frost, D. C.; Ishitani, A.; McDowell, C. A.

doi:10.1080/00268977200101961

Cited by 499 publications

(138 citation statements)

References 11 publications

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“…Koppelman and Dillard (1977) mentioned the reduction of Cu(II) adsorbed on chlorite by the photoreduction effect; this effect increased with exposure time to the X-ray beam. This phenomenon was also observed in other Cu(II) systems by Rosencwaig et al (1971), Frost et al (1972), and Wallbank et al (1973).…”

Section: Photoreduction Effectmentioning

confidence: 54%

Natural and Synthetic Copper Phyllosilicates Studied by XPS

Mosser

Roméo

et al. 1992

Clays and clay miner.

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Abstract--X-ray photoelectron spectroscopy (XPS) has been used to characterize the bonding state of Cu 2 § Si 4+, A13 § and 02 ions in structural (octahedral and interlamellar) or adsorbed position in phyllosilicates. Five smectites, 5 kaolinites, and 1 chrysocolla with Cu(II) in known positions (octahedral, interlamellar, or surface adsorbed) have been investigated. Their spectra were compared with those of pure Cu metal and of pure Cu(I) and Cu(II) oxides.The line for Cu 2p3/2 (binding energy of 935.4 eV) and well-defined shake-up lines (binding energy of about 943 eV) observed after 1 hr of X-ray irradiation are characteristic of Cu(II) in phyllosilicate octahedral sites. But due to the photoreduction effect, they show Cu(I) oxidation states (Cu 2P3/2, binding energy of 933.2 eV and near absence of shake-up lines) for the phyllosilicates with adsorbed Cu or in interlamellar positions. The kinetics of photoreduction distinguishes octahedral from interlamellar positions, and the latter from a surface adsorbed position. The enlargement of the FWHM (full width at half maximum) of XPS lines has been used to describe crystallochemical parameters linked to local ordering around the probe cations. Crystallization produces decreasing O 1 s and Cu 2p (octahedral cation) line widths but has no effect on the Si 2p (tetrahedral cation) line width. The enlargement of FWHM for all ion lines of the lattice is linked to the nature (Cu > Mg > AI) and the number and amount of structural cations in the phyllosilicates.

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Section: Photoreduction Effectmentioning

confidence: 54%

Natural and Synthetic Copper Phyllosilicates Studied by XPS

Mosser

Roméo

et al. 1992

Clays and clay miner.

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“…An additional feature is noted in the copper spectrum 9 The shoulder at lower binding energy on the main copper 2p3/2 photopeak is due to photoreduction of the adsorbed Cu(lI). This phenomenon has been observed in other copper(II) systems, (Frost et al, 1972;Rosencwaig et al, 1971 ;Wallbank et al, 1973) and has been studied in sufficient detail to permit an explanation of the copper photopeak shape. The main peak and the associated satellite peak are due to copper(II).…”

Section: Resultsmentioning

confidence: 85%

A Study of the Adsorption of Ni(II) and Cu(II) by Clay Minerals

Koppelman

Dillard

1977

Clays and clay miner.

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Abstract--The adsorption of Ni(II) and Cu(II) on to the clay minerMs kaolinite, chlorite, and illite has been investigated. The quantity of Ni(II) at pH 6 and Cu(II) at pH 5 adsorbed has been found to vary in the manner chlorite > illite > kaolinite. Examination of the mode of bonding of the metal ions to the clay minerals using X-ray photoelectron spectroscopy (XPS) has been carried out. Comparison of the binding energies for metal ions in octahedral sites in selected minerals (reference minerals) and in simple nickel and copper containing compounds with values for Ni(II) and Cu(II) adsorbed on chlorite indicate that nickel(II) is probably bound as the aquo ion while copper(II) may be adsorbed as Cu(OH) § INTRODUCTION

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“…Although it is true that the Cu 2p 3/2 BEs (932.6-932.8 eV) are typical of compounds containing Cu + and Cu 0 , care must be taken in interpreting these spectra, because the correlation between Cu 2p 3/2 BE with oxidation state is not straightforward. 29 The more definitive signature is an intense satellite (at 940-945 eV) above the 2p 3/2 core-line peak that is characteristic for Cu 2+ but not Cu 1+ or Cu 0 (Two theories involving either a "shake-up" or a "shake-down" process have been proposed; both predict that the satellite is only possible for Cu 2+ where empty 3d conduction states are available). 30,31 The absence of such a satellite and the resemblance of the spectra to those of copper (I) …”

Section: A Xpsmentioning

confidence: 99%

Thermoelectric properties ofp-type CuInSe2chalcopyrites enhanced by introduction of manganese

et al. 2011

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Thermoelectric properties, X-ray photoelectron spectroscopy, Raman spectroscopy, and electronic structures have been studied for Mn-substituted CuInSe 2 chalcopyrites. Raman spectroscopy verifies the lattice disorder due to the introduction of Mn into the CuInSe 2 matrix, leading to a slight suppression of thermal conductivity. On the other hand, the Mn substitution significantly increases the electrical conductivity and Seebeck coefficient. Therefore the thermoelectric figure of merit, ZT, has been enhanced by over two orders of magnitude by the introduction of Mn into CuInSe 2 . These materials are p-type degenerate semiconductors, containing divalent Mn species as confirmed by X-ray photoelectron spectroscopy. The crystal structure of Mn-substituted CuInSe 2 , as well as related ternary and quaternary diamond-like semiconductors, can be viewed as a combination of an electrically conducting unit, the

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X-ray photoelectron spectroscopy of copper compounds

Cited by 499 publications

References 11 publications

Natural and Synthetic Copper Phyllosilicates Studied by XPS

Natural and Synthetic Copper Phyllosilicates Studied by XPS

A Study of the Adsorption of Ni(II) and Cu(II) by Clay Minerals

Thermoelectric properties ofp-type CuInSe2chalcopyrites enhanced by introduction of manganese

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