One-step synthesis of Cu3N, Cu2S and Cu9S5 and photocatalytic degradation of methyl orange and methylene blue

Sithole, Rudo K.; Machogo, Lerato F.E.; Moloto, Makwena J.; Gqoba, Siziwe; Mubiayi, Kalenga P.; Wyk, Juanita L. van; Moloto, Nosipho

doi:10.1016/j.jphotochem.2020.112577

Cited by 49 publications

(27 citation statements)

References 40 publications

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“…In addition, satellite peaks are observed at about 943 and 963 eV, which suggest the presence of some Cu 2+ also. This is consistent with previous studies that have shown the existence of both Cu + and Cu 2+ in Cu 9 S 5 , the former being the major component [52–54] . The S 2p spectrum showed the 2p 3/2 and 2p 1/2 binding energy at 161.8 and 162.9 eV, respectively, due to S 2− in the Digenite mineral [52–54] .…”

Section: Methodssupporting

confidence: 92%

“…This is consistent with previous studies that have shown the existence of both Cu + and Cu 2+ in Cu 9 S 5 , the former being the major component [52–54] . The S 2p spectrum showed the 2p 3/2 and 2p 1/2 binding energy at 161.8 and 162.9 eV, respectively, due to S 2− in the Digenite mineral [52–54] . It also displayed existence of the additional deconvoluted peaks due to organic sulfur of the surface ODT ligand; 163.7 and 164.9 eV due to ‐SH group, and 168.8 and 169.9 eV due to oxidized CSO 3 H group (Figure 3b).…”

Section: Methodssupporting

confidence: 90%

“…[52][53][54][55][56][57] High-resolution core-level Cu 2p XPS spectrum for Cu 9 S 5 NPs displayed two major peaks at binding energy 932 and 951.8 eV, for 2p 3/2 and 2p 1/2 , respectively, which are characteristics of Cu + (Figure 3a). [52][53][54] This is further supported by the spin-orbit coupling spacing value (2p 3/ shown the existence of both Cu + and Cu 2 + in Cu 9 S 5 , the former being the major component. [52][53][54] The S 2p spectrum showed the 2p 3/2 and 2p 1/2 binding energy at 161.8 and 162.9 eV, respectively, due to S 2À in the Digenite mineral.…”

mentioning

confidence: 99%

“…The XPS survey spectra of these ODT-capped Cu 9 S 5 and Ag 2 S NPs showed the presence of expected elements and the respective binding energies. [52][53][54][55][56][57] High-resolution core-level Cu 2p XPS spectrum for Cu 9 S 5 NPs displayed two major peaks at binding energy 932 and 951.8 eV, for 2p 3/2 and 2p 1/2 , respectively, which are characteristics of Cu + (Figure 3a). [52][53][54] This is further supported by the spin-orbit coupling spacing value (2p 3/ shown the existence of both Cu + and Cu 2 + in Cu 9 S 5 , the former being the major component.…”

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confidence: 99%

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Coinage Metal Complexes with Di‐tertiary‐butyl Sulfide as Precursors with Ultra‐Low Decomposition Temperature

Gahlot

Purohit

Jeanneau

et al. 2021

Chemistry A European J

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We report here the synthesis of [Cu 2 (TFA) 4 ( t Bu 2 S) 2 ] (1), [Ag 4 (TFA) 4 ( t Bu 2 S) 4 ] (2) and [AuCl( t Bu 2 S)] (3) (TFA = trifluoroacetate), which decompose in solution medium at ultra-low temperature (e. g., in boiling toluene) to afford phase-pure and highly crystalline Cu 9 S 5 , Ag 2 S and metallic Au nanoparticles, respectively. The low decomposition temperature of these precursors is attributed to the facile decomposition mechanism in the di-tertiary-butyl sulfide ligand. These results are a significant step in the direction of establishing a general low-temperature strategy spanning a range of systems including thermodynamically metastable materials and incorporate them in technologies that are sensitive to the harsh conditions.

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Section: Methodssupporting

confidence: 92%

Section: Methodssupporting

confidence: 90%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Coinage Metal Complexes with Di‐tertiary‐butyl Sulfide as Precursors with Ultra‐Low Decomposition Temperature

Gahlot

Purohit

Jeanneau

et al. 2021

Chemistry A European J

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“…The metal oxides' mono-component samples exhibited oxygen excess due to the oxygen atmosphere used for the annealing treatment. However, the Cu 2 S benchmark showed a sulfur deficit, which was consistent with other studies [48][49][50] indicating the tendency of sulfur sublimation during the thermal treatment. The sublimation was significantly reduced by the low thermal temperature treatment and Ar environment around the capsule.…”

Section: Composition and Morphologysupporting

confidence: 91%

Photocatalytic Activity of Cu2S/WO3 and Cu2S/SnO2 Heterostructures for Indoor Air Treatment

Eneşca

Isac

2021

Materials

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Volatile organic compounds (VOCs) are commonly found in indoor spaces (e.g., homes or offices) and are often related to various illnesses, some of them with carcinogenic potential. The origins of VOC release in the indoor environment are in office products, building materials, electronics, cleaning products, furniture, and maintenance products. VOC removal can be done based on two types of technologies: adsorption in specific materials and decomposition via oxidative processes. The present article reports the development and photocatalytic activity of two heterostructures (Cu2S/WO3 and Cu2S/SnO2) used for indoor air decontamination. The acetaldehyde removal rate is discussed in correlation with the S-scheme mechanisms established between the heterostructure components but also comparatively with the bare catalysts’ activity. Acetaldehyde was considered as a VOC reference because it was found by the International Agency for Research on Cancer to be one of the most frequent air toxins with potential carcinogenic effects. The samples contained monoclinic WO3, tetragonal SnO2, and orthorhombic Cu2S crystalline structures. The Cu2S crystallite size in the heterostructure varied from 75.9 to 82.4 Å, depending on the metal oxide substrate. The highest photocatalytic efficiency (75.7%) corresponded to Cu2S/SnO2, with a constant rate of 0.106 s−1 (which was three times faster than WO3 or SnO2 and seven and a half times faster than Cu2S).

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The Chemistry of Cu₃N and Cu₃PdN Nanocrystals**

et al. 2022

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The precursor conversion chemistry and surface chemistry of Cu 3 N and Cu 3 PdN nanocrystals are unknown or contested. Here, we first obtain phase-pure, colloidally stable nanocubes. Second, we elucidate the pathway by which copper(II) nitrate and oleylamine form Cu 3 N. We find that oleylamine is both a reductant and a nitrogen source. Oleylamine is oxidized by nitrate to a primary aldimine, which reacts further with excess oleylamine to a secondary aldimine, eliminating ammonia. Ammonia reacts with Cu I to form Cu 3 N. Third, we investigated the surface chemistry and find a mixed ligand shell of aliphatic amines and carboxylates (formed in situ). While the carboxylates appear tightly bound, the amines are easily desorbed from the surface. Finally, we show that doping with palladium decreases the band gap and the material becomes semi-metallic. These results bring insight into the chemistry of metal nitrides and might help the development of other metal nitride nanocrystals.

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One-step synthesis of Cu3N, Cu2S and Cu9S5 and photocatalytic degradation of methyl orange and methylene blue

Cited by 49 publications

References 40 publications

Coinage Metal Complexes with Di‐tertiary‐butyl Sulfide as Precursors with Ultra‐Low Decomposition Temperature

Coinage Metal Complexes with Di‐tertiary‐butyl Sulfide as Precursors with Ultra‐Low Decomposition Temperature

Photocatalytic Activity of Cu2S/WO3 and Cu2S/SnO2 Heterostructures for Indoor Air Treatment

The Chemistry of Cu₃N and Cu₃PdN Nanocrystals**

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One-step synthesis of Cu3N, Cu2S and Cu9S5 and photocatalytic degradation of methyl orange and methylene blue

Cited by 49 publications

References 40 publications

Coinage Metal Complexes with Di‐tertiary‐butyl Sulfide as Precursors with Ultra‐Low Decomposition Temperature

Coinage Metal Complexes with Di‐tertiary‐butyl Sulfide as Precursors with Ultra‐Low Decomposition Temperature

Photocatalytic Activity of Cu2S/WO3 and Cu2S/SnO2 Heterostructures for Indoor Air Treatment

The Chemistry of Cu3N and Cu3PdN Nanocrystals**

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The Chemistry of Cu₃N and Cu₃PdN Nanocrystals**