XPS study of clean metal sulfide surfaces

Laajalehto, K.; Kartio, I.; Nowak, Paweł

doi:10.1016/0169-4332(94)90080-9

Cited by 175 publications

(77 citation statements)

References 10 publications

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“…Thus, no clear distinction in the kinetic energies of the Auger peak position for copper in chalcocite Cu 2 S and that for metallic Cu [Cu(0)] could be made in our samples. For the roxbyite film obtained after 25 min, the Cu L 3 M 45 M 45 peak was observed at a kinetic energy of 917.82 eV, which agreed well with the kinetic energy reported for the roxbyite phase [20]. For the covellite film obtained after 35 min, the Cu L 3 M 45 M 45 peak was observed at a kinetic energy of 918.15 eV, which agreed well with the kinetic energy reported for the covellite phase [21,29,33] spectra, an observation that is useful for detailed analysis with the aim of differentiating various copper sulfide phases spectroscopically.…”

Section: Film Composition and Chemical Environment: Xps Analysissupporting

confidence: 79%

“…This showed that the Cu 2p XPS core-level spectrum was not sufficiently sensitive to distinguish between the monovalent [Cu(I)] and metallic [Cu(0)] states of copper in our sample because of the similar binding energies of these two states [30]. For the sample sulfurized for 25 min, peak fitting revealed the presence of a well-defined peak with the Cu 2 p 3/2 binding energy located at 932.5 eV, which agreed well with the Cu 2 p 3/2 binding energy reported for the monovalent state of copper in roxbyite Cu 7 S 4 [20]. Note that this binding energy was 0.2 eV lower than that of the chalcocite Cu 2 S in the sample sulfurized for 20 min.…”

Section: Film Composition and Chemical Environment: Xps Analysissupporting

confidence: 77%

“…The binding energy of the S 2 p 3/2 peak of the shoulder doublet was observed at 162.8 eV. This doublet was attributed to the presence of a highly Cu-deficient nonstoichiometric sulfide (∼17.4% of the S 2p total peak area) in the film [19,20]. The binding energy of the S 2 p 3/2 peak of the additional weak doublet was observed at 168.15 eV.…”

Section: Film Composition and Chemical Environment: Xps Analysismentioning

confidence: 84%

See 2 more Smart Citations

Structural studies of copper sulfide films: effect of ambient atmosphere

Kundu

Hasegawa

Terabe

et al. 2008

Science and Technology of Advanced Materials

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We examined the structural properties of copper sulfide films as a function of the sulfurization time of 70-nm-thick Cu films. Copper sulfide films with various phases such as mixed metallic Cu-chalcocite, chalcocite, roxbyite, and covellite phases were formed with increasing sulfurization time. To evaluate the structural stability of various films, all the films were exposed to the ambient atmosphere for the same amount of time. Although the phase structure and stoichiometry of the films were maintained at a greater depth, the near-surface region of the films was oxidized and covered with overlayers of oxide, hydroxide, and/or sulfate species due to the exposure and reaction with the ambient atmosphere. The oxygen uptake and its reactivity with the copper sulfide film surfaces were enhanced with increasing sulfur content of the films. In addition, the type of divalent state of copper formed on the film surfaces depended on the phase structure, composition, and stoichiometry of the films.

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Section: Film Composition and Chemical Environment: Xps Analysissupporting

confidence: 79%

Section: Film Composition and Chemical Environment: Xps Analysissupporting

confidence: 77%

Section: Film Composition and Chemical Environment: Xps Analysismentioning

confidence: 84%

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Structural studies of copper sulfide films: effect of ambient atmosphere

Kundu

Hasegawa

Terabe

et al. 2008

Science and Technology of Advanced Materials

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“…The good agreement with the literature values supports the high purity of our metal chalcogenide nanostructures. [49][50][51][52][53][54][55][56][57] The size and morphology of the metal chalcogenide nanostructures are characterized by TEM in Figure 3. The particle size distribution of each sample, counted from 200 particles, is presented in Figure S5.…”

Section: Resultsmentioning

confidence: 99%

Robust scalable synthesis of surfactant-free thermoelectric metal chalcogenide nanostructures

Han

et al. 2015

Nano Energy

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, S. Xue. (2015). Robust scalable synthesis of surfactant-free thermoelectric metal chalcogenide nanostructures. Nano Energy, Robust scalable synthesis of surfactant-free thermoelectric metal chalcogenide nanostructures AbstractA robust low-cost ambient aqueous method for the scalable synthesis of surfactant-free nanostructured metal chalcogenides (MaXb, M=Cu, Ag, Sn, Pb, and Bi; X=S, Se, and Te; a=1 or 2; and b=1 or 3) is developed in this work. The effects of reaction parameters, such as precursor concentration, ratio of precursors, and amount of reducing agent, on the composition, size, and shape of the resultant nanostructures have been comprehensively investigated. This environmentally friendly approach is capable of producing metal chalcogenide nanostructures in a one-pot reaction on a large scale, which were investigated for their thermoelectric properties towards conversion of waste heat into electricity. The results demonstrate that the thermoelectric properties of these metal chalcogenide nanostructures are strongly dependent on the types of metal chalcogenides, and their figure of merits are comparable with previously reported figures for their bulk or nanostructured counterparts.

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“…[55,56]. The higher energy peak may have originated from S 2 2− in disulfides such as CuS 2 or FeS 2 [57], of which FeS 2 may be pyrite fines adsorbed on the gold surface whilst CuS 2 may occur as an ammonia copper(I) polysulfide [21]. Obviously, the intensity and area of peak in the presence of pyrite was much stronger and larger than that in the presence of quartz, indicating that the increased quantity of sulfur element on gold surfaces.…”

Section: Effect Of Pyrite On Gold Dissolutionmentioning

confidence: 99%

Effect of Pyrite on Thiosulfate Leaching of Gold and the Role of Ammonium Alcohol Polyvinyl Phosphate (AAPP)

Liu

Min

et al. 2017

Metals

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Abstract:The effect of pyrite and the role of ammonium alcohol polyvinyl phosphate (AAPP) during gold leaching in ammoniacal thiosulfate solutions were investigated using pure gold foils. The results showed that pyrite catalyzed the decomposition and also significantly increased the consumption of thiosulfate. This detrimental effect became more severe with increasing pyrite content. Further, the presence of pyrite also substantially slowed the gold leaching kinetics and reduced the overall gold dissolution. The reduction in gold dissolution was found to be caused primarily by the surface passivation of the gold. The negative effects of pyrite, however, can be alleviated by the addition of AAPP. Comparison of zeta potentials of pyrite with and without AAPP suggests that AAPP had adsorbed on the surface of the pyrite and weakened the catalytic effect of pyrite on the thiosulfate decomposition by blocking the contact between the pyrite and thiosulfate anions. AAPP also competed with thiosulfate anions to complex with the cupric ion at the axial coordinate sites, and thus abated the oxidation of thiosulfate by cupric ions. Moreover, the indiscriminate adsorption of AAPP on the surfaces of gold and passivation species prevented the passivation of the gold surface by surface charge and electrostatic repulsion. Therefore, AAPP effectively stabilized the thiosulfate in the solution and facilitated the gold leaching in the presence of pyrite.

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XPS study of clean metal sulfide surfaces

Cited by 175 publications

References 10 publications

Structural studies of copper sulfide films: effect of ambient atmosphere

Structural studies of copper sulfide films: effect of ambient atmosphere

Robust scalable synthesis of surfactant-free thermoelectric metal chalcogenide nanostructures

Effect of Pyrite on Thiosulfate Leaching of Gold and the Role of Ammonium Alcohol Polyvinyl Phosphate (AAPP)

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