Controlled structural and compositional characteristic of visible light active ZnO/CuO photocatalyst for the degradation of organic pollutant

Harish, S.; Archana, J.; Sabarinathan, M.; Navaneethan, M.; Nisha, K.D.; Ponnusamy, S.; Muthamizhchelvan, C.; Ikeda, Hiroya; Aswal, D. K.; Hayakawa, Y.

doi:10.1016/j.apsusc.2016.12.082

Cited by 151 publications

(56 citation statements)

References 43 publications

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“…Moreover, no precise studies based on systematic lattice parameters variation were presented. The results of the present equilibration study at 900 °C are in fact more in line with other studies, including TEM characterization showing that CuO nanoparticles segregate on the surface of ZnO crystallites even for 1 at.% Cu doping [19]. The slight decrease of the ZnO c-axis length could be due to very low level Cu doping (ppm range) as observed in ZnO samples exhibiting green luminescence [27].…”

Section: Resultssupporting

confidence: 92%

“…However, Zn being not magnetic, it represents a favo rable case for high-temperature superconductors. Furthermore, the use of ZnO in association with SrO or CuO for various applications [12][13][14][15][16][17][18][19] as well as that of SrZnO 2 as a catalyst for PET depolymerization under microwave irradiation [20] or as host material for red or blue emitting phosphors [21,22] make the study of this system interesting in view of optimizing the processing parameters of samples aimed at various technological applications. The equilibration conditions for the present study (air atmosphere and 900 °C) correspond to conditions similar to those used for the synthesis of various high temperature superconductors [23,24].…”

Section: Introductionmentioning

confidence: 99%

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Subsolidus phase equilibria of the CuO – SrO – ZnO pseudoternary system in air at 900 °C

Grivel

2017

Chim.Tech.Acta

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The subsolidus phase equilibria of the CuO-SrO-ZnO system were determined at 900 °C in air. The pseudoternary section does not contain ternary oxide phases but is made of 5 three-phase regions and 2 narrow two-phase regions linked to a Sr 14 Cu 24-x Zn x O 41-y solid solution. The maximum solubility of Zn in this phase is limited to x ≈ 0.1, but this low doping level results in a significant decrease of the electrical resistivity by about one order of magnitude compared to the undoped compound. The other binary oxide phases SrZnO 2 , Sr 2 CuO 3 , and SrCuO 2 do not form solid solutions extending into the ternary system. SrZnO 2 was found to decompose upon contact with ambient air.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Subsolidus phase equilibria of the CuO – SrO – ZnO pseudoternary system in air at 900 °C

Grivel

2017

Chim.Tech.Acta

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“…In the light of the aforementioned information and recalling that the electron affinity in CuO is 4.07 eV [ 28 ] and that of γ ‐In 2 Se 3 [ 29 ] is 3.60 eV, here, the conduction band offset (

Δ E_{normalc} = | q χ_{CuO} - q χ_{γ ‐ {In}_{2} {Se}_{3}} |

) is 0.47 eV. The largest energy bandgaps difference is (

Δ E_{normalg} = | E_{normalg}^{CuO} - E_{normalg}^{γ ‐ {In}_{2} {Se}_{3}} |

) difference is

1.43 \pm 0.06

eV and the lowest difference is

0.23 \pm 0.06

eV.…”

Section: Resultsmentioning

confidence: 99%

Band Offsets, Optical Conduction, and Microwave Band Filtering Characteristics of γ‐In₂Se₃/CuO Heterojunctions

Qasrawi

Kmail

2020

Physica Status Solidi (b)

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Herein, the design and experimental characterization of γ‐In2Se3/CuO interfaces are considered. Thin films of γ‐In2Se3 are coated with thin layers of CuO at room temperature. The heterojunction device is structurally, morphologically, and optically characterized. It is observed that the coating of CuO onto γ‐In2Se3 engenders the formation of CuSe2 at the ultrathin interface. The γ‐In2Se3/CuO heterojunctions exhibit maximum possible conduction and valence band offsets of values 0.47 and 0.96 eV, respectively. The dielectric spectra display two dielectric resonance peaks at 2.96 and 1.78 eV. In addition, analyses of the optical conductivity spectra reveal accurate drift mobility and plasmon frequency values of 31.31 cm2 Vs−1 and 1.5 GHz, respectively. The ability of the device to control the signal propagation at gigahertz level is experimentally tested by the impedance spectroscopy technique which proved the ability of the device to behave as bandpass filters of notch frequency of 1.49 GHz. The γ‐In2Se3/CuO heterojunction devices are also observed to display terahertz cutoff frequency values of ≈24 THz in the infrared (IR) range of incident photon energy and ≈193 THz in the ultraviolet light range. The nonlinear optical performance of the device nominates it for use as terahertz/gigahertz band filters.

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“…In the last decade, enormous efforts have been made to prepare different photocatalysts, for example Ag 3 PO 4 /ZnO [105,106], ZnO/CuO [107,108], ZnO@AgI [109,110], TiO 2 /g-C 3 N 4 [111], MoS 2 @Cu 2 S [112], and so on, for degrading various organic dyes, such as methyl orange (MO) [112,113,114], RhB [105,106,107,108,115], methylene blue (MB) [116,117], phenol [118], etc. It can be seen from Table 1 that even if the components constituting the heterojunction photocatalyst are the same, the photocatalytic degradation efficiency is not the same due to the different conditions in experimental, such as, the amount of catalyst, the type and concentration of organic dyes, and the source used in photocatalytic degradation experiments, the distance between the sample and the source, and the exposure time.…”

Section: Resultsmentioning

confidence: 99%

Engineering Charge Transfer Characteristics in Hierarchical Cu2S QDs @ ZnO Nanoneedles with p–n Heterojunctions: Towards Highly Efficient and Recyclable Photocatalysts

et al. 2018

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Equipped with staggered gap p-n heterojunctions, a new paradigm of photocatalysts based on hierarchically structured nano-match-shaped heterojunctions (NMSHs) Cu2S quantum dots (QDs)@ZnO nanoneedles (NNs) are successfully developed via engineering the successive ionic layer adsorption and reaction (SILAR). Under UV and visible light illumination, the photocatalytic characteristics of Cu2S@ZnO heterojunctions with different loading amounts of Cu2S QDs are evaluated by the corresponding photocatalytic degradation of rhodamine B (RhB) aqueous solution. The results elaborate that the optimized samples (S3 serial specimens with six cycles of SILAR reaction) by means of tailored the band diagram exhibit appreciable improvement of photocatalytic activities among all synthesized samples, attributing to the sensitization of a proper amount of Cu2S QDs. Such developed architecture not only could form p–n junctions with ZnO nanoneedles to facilitate the separation of photo-generated carries but also interact with the surface defects of ZnO NNs to reduce the electron and hole recombination probability. Moreover, the existence of Cu2S QDs could also extend the light absorption to improve the utilization rate of sunlight. Importantly, under UV light S3 samples demonstrate the remarkably enhanced RhB degradation efficiency, which is clearly testified upon the charge transfer mechanism discussions and evaluations in the present work. Further supplementary investigations illustrate that the developed nanoscale Cu2S@ZnO heterostructures also possess an excellent photo-stability during our extensive recycling photocatalytic experiments, promising for a wide range of highly efficient and sustainably recyclable photocatalysts applications.

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Controlled structural and compositional characteristic of visible light active ZnO/CuO photocatalyst for the degradation of organic pollutant

Cited by 151 publications

References 43 publications

Subsolidus phase equilibria of the CuO – SrO – ZnO pseudoternary system in air at 900 °C

Subsolidus phase equilibria of the CuO – SrO – ZnO pseudoternary system in air at 900 °C

Band Offsets, Optical Conduction, and Microwave Band Filtering Characteristics of γ‐In₂Se₃/CuO Heterojunctions

Engineering Charge Transfer Characteristics in Hierarchical Cu2S QDs @ ZnO Nanoneedles with p–n Heterojunctions: Towards Highly Efficient and Recyclable Photocatalysts

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Controlled structural and compositional characteristic of visible light active ZnO/CuO photocatalyst for the degradation of organic pollutant

Cited by 151 publications

References 43 publications

Subsolidus phase equilibria of the CuO – SrO – ZnO pseudoternary system in air at 900 °C

Subsolidus phase equilibria of the CuO – SrO – ZnO pseudoternary system in air at 900 °C

Band Offsets, Optical Conduction, and Microwave Band Filtering Characteristics of γ‐In2Se3/CuO Heterojunctions

Engineering Charge Transfer Characteristics in Hierarchical Cu2S QDs @ ZnO Nanoneedles with p–n Heterojunctions: Towards Highly Efficient and Recyclable Photocatalysts

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Band Offsets, Optical Conduction, and Microwave Band Filtering Characteristics of γ‐In₂Se₃/CuO Heterojunctions