High-quality optically defect-free 1D ZnS nanostructures by a modified thermal evaporation method

Tran, Manh Trung; Dư, Nguyễn Văn; Nguyen, Thuan Dinh; Huyen, Nguyen Thi; Hùng, Nguyễn Duy; Viet, Dao Xuan; Ha, Nam Chul; Trung, Đỗ Quang; Huy, Phạm Thành

doi:10.1016/j.optmat.2021.111963

Cited by 10 publications

(2 citation statements)

References 38 publications

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“…As it is possible in all cases to use a single doublet to reproduce the form of the S 2p peak, one may infer that each sample surface comprised only one S-containing compound in significant quantities. Furthermore, the 2p 1/2 and 2p 3/2 components are centred at binding energies of 162.1–162.2 eV and 160.9–161.0 eV, respectively, which are consistent with the S 2p peak positions typically reported for ZnS ( Tran et al, 2022 ).…”

Section: Resultssupporting

confidence: 86%

Photocatalytic Degradation of Rhodamine B Dye and Hydrogen Evolution by Hydrothermally Synthesized NaBH4—Spiked ZnS Nanostructures

et al. 2022

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Metal sulphides, including zinc sulphide (ZnS), are semiconductor photocatalysts that have been investigated for the photocatalytic degradation of organic pollutants as well as their activity during the hydrogen evolution reaction and water splitting. However, devising ZnS photocatalysts with a high overall quantum efficiency has been a challenge due to the rapid recombination rates of charge carriers. Various strategies, including the control of size and morphology of ZnS nanoparticles, have been proposed to overcome these drawbacks. In this work, ZnS samples with different morphologies were prepared from zinc and sulphur powders via a facile hydrothermal method by varying the amount of sodium borohydride used as a reducing agent. The structural properties of the ZnS nanoparticles were analysed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) techniques. All-electron hybrid density functional theory calculations were employed to elucidate the effect of sulphur and zinc vacancies occurring in the bulk as well as (220) surface on the overall electronic properties and absorption of ZnS. Considerable differences in the defect level positions were observed between the bulk and surface of ZnS while the adsorption of NaBH4 was found to be highly favourable but without any significant effect on the band gap of ZnS. The photocatalytic activity of ZnS was evaluated for the degradation of rhodamine B dye under UV irradiation and hydrogen generation from water. The ZnS nanoparticles photo-catalytically degraded Rhodamine B dye effectively, with the sample containing 0.01 mol NaBH4 being the most efficient. The samples also showed activity for hydrogen evolution, but with less H2 produced compared to when untreated samples of ZnS were used. These findings suggest that ZnS nanoparticles are effective photocatalysts for the degradation of rhodamine B dyes as well as the hydrogen evolution, but rapid recombination of charge carriers remains a factor that needs future optimization.

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Section: Resultssupporting

confidence: 86%

Photocatalytic Degradation of Rhodamine B Dye and Hydrogen Evolution by Hydrothermally Synthesized NaBH4—Spiked ZnS Nanostructures

et al. 2022

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“…In sulfur 2p HR (high resolution) spectra (Figure c), the deconvoluted peaks at 162.1 and 163.5 eV represent the occurrence of Zn–S and C–S, respectively. In Figure d, HR zinc 2p spectra consist of two peaks at 1022.2 and 1045.3 eV, corresponding to 2p 3/2 and 2p 1/2 spin–orbital splitting, respectively. , The splitting consists of 23.1 eV energy, representing the 2 + oxidation state of Zn. , The deconvoluted peaks at 284.8, 286.0, and 288.5 eV in the HR carbon 1s spectra (Figure e) represent the existence of C–C, C–O/C–S, and O–CO, respectively. In Figure f, the oxygen 1s spectra are deconvoluted into two peaks at 531.7 and 532.8 eV, which belong to O–CO and Zn–O, respectively.…”

Section: Resultsmentioning

confidence: 98%

Surface-Sulfurized Zn-MOF Grown on Ni-Foam with Various Sulfurizing Agents for Aqueous Hybrid Supercapacitor Device Fabrication

Balamurugan,

Chandra Bose

2024

ACS Appl. Energy Mater.

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Metal−organic frameworks (MOFs) are an emerging material with a high specific surface area, desired morphology, and tunable pore size. However, MOFs suffer due to low electrical conductivity. Transition-metal sulfides are excellent supercapacitor materials because of their large storage capacity and electrical conductivity. To preserve a high surface area and obtain high electrical conductivity, Zn-MOF is directly grown on Ni-foam, and its surface is modified through various sulfurizing agents. The asfabricated Zn-MOF on Ni-foam exhibits a vertically oriented triangular rod-like morphology. Banana blossom, fiber, and rod-like morphologies are obtained due to the surface etching and surface sulfurization process by sulfurizing agents thioacetamide (TAA), sulfur (S), and thiourea (TU), respectively. The role of iR compensation in cyclic voltammetry analysis with higher mass-loading electrodes is established. The variations in its charge storage mechanism and charge-transfer kinetics corresponding to various sulfurizing agents are examined. Compared to other commonly used sulfurizing agents, TAA-assisted surface-sulfurized Zn-MOF provided excellent charge storage performance. It exhibits a maximum areal capacity of 4484 mC cm −2 (specific capacity of 747.3 C g −1 ) at a current density of 10 mA cm −2 . The asfabricated aqueous hybrid supercapacitor device exhibits a maximum specific energy of 77.8 W h kg −1 at a specific power of 0.73 kW kg −1 , even with a higher mass loading of 12.2 mg. The role and importance of mass loading are described by using an expanded Ragone plot.

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Optical constants, photoluminescence and thermogravimetry of ZnS–ZnO hybrid nanowires synthesized via vapor transport

2022

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High-quality optically defect-free 1D ZnS nanostructures by a modified thermal evaporation method

Cited by 10 publications

References 38 publications

Photocatalytic Degradation of Rhodamine B Dye and Hydrogen Evolution by Hydrothermally Synthesized NaBH4—Spiked ZnS Nanostructures

Photocatalytic Degradation of Rhodamine B Dye and Hydrogen Evolution by Hydrothermally Synthesized NaBH4—Spiked ZnS Nanostructures

Surface-Sulfurized Zn-MOF Grown on Ni-Foam with Various Sulfurizing Agents for Aqueous Hybrid Supercapacitor Device Fabrication

Optical constants, photoluminescence and thermogravimetry of ZnS–ZnO hybrid nanowires synthesized via vapor transport

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