Facile wet chemical synthesis of ZnO nanosheets: Effects of counter ions on the morphological, structural, optical and photocatalytic properties

Sahu, Kavita; Choudhary, Shipra; Singh, Jaspal; Kuriakose, Sini; Singhal, Rahul; Mohapatra, Satyabrata

doi:10.1016/j.ceramint.2018.09.116

Cited by 41 publications

(10 citation statements)

References 31 publications

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“…Finally, ultrathin 2D metal oxide nanosheets with good crystallization are obtained after removing surfactants by filtration and centrifugation ( Alli et al., 2020 ; Sun et al., 2014 ). Based on this generalized synthesis strategy, ultrathin 2D MOXs (TiO 2 [ Lan et al., 2018 ], ZnO [ Sahu et al., 2018 ], MoO 3 [ Alsaif et al., 2014 ], and WO 3 [ Khan et al., 2017 ]) have been successfully synthesized.…”

Section: Fabrication Methods Of 2d Metal Oxidesmentioning

confidence: 99%

Recent advances in the fabrication of 2D metal oxides

et al. 2022

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Summary Atomically thin two-dimensional (2D) metal oxides exhibit unique optical, electrical, magnetic, and chemical properties, rendering them a bright application prospect in high-performance smart devices. Given the large variety of both layered and non-layered 2D metal oxides, the controllable synthesis is the critical prerequisite for enabling the exploration of their great potentials. In this review, recent progress in the synthesis of 2D metal oxides is summarized and categorized. Particularly, a brief overview of categories and crystal structures of 2D metal oxides is firstly introduced, followed by a critical discussion of various synthesis methods regarding the growth mechanisms, advantages, and limitations. Finally, the existing challenges are presented to provide possible future research directions regarding the synthesis of 2D metal oxides. This work can provide useful guidance on developing innovative approaches for producing both 2D layered and non-layered nanostructures and assist with the acceleration of the research of 2D metal oxides.

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Section: Fabrication Methods Of 2d Metal Oxidesmentioning

confidence: 99%

Recent advances in the fabrication of 2D metal oxides

et al. 2022

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“…Anions of the precursor salts to synthesize ZnO nanostructures show a significant influence on the morphological and optical properties of the materials and also their field of applications. Sahu et al, 14 Distaso et al, 15 and Boppella et al 16 have also worked on the variation of precursor salts. However, none of the groups have provided experimental evidence of the surface charge of the nanostructures and correlated photoluminescence with their morphologies.…”

Section: Introductionmentioning

confidence: 99%

Counterion-Induced Tailoring of Energy Transfer in Hydrothermally Grown Nanostructured ZnO for Photocatalysis

Sahu

Kar

2021

Crystal Growth & Design

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Morphological tailoring of zinc oxide (ZnO) nanostructures, viz., nanogranules, hexagonal pillars, and nanorods, has been demonstrated using the hydrothermal method by varying the precursor salts of zinc. Counterions of precursor salts, such as zinc chloride, zinc acetate, and zinc nitrate, are found to influence nucleation and growth of the nanostructures. Determination of crystalline and morphological properties of different nanostructures has been carried out by using X-ray diffraction and field emission scanning electron microscopy. The X-ray photoelectron spectroscopy technique is used for the investigation in a comparative surface study of ZnO nanostructures, and possible growth mechanisms of different nanostructures have been described. Bandgap and Urbach energies of the materials are also affected by the counterions of the precursor salts. Fourier transform infrared spectra of ZnO nanostructures show shifting of band positions of the functional group caused by variation of the precursor salt. Features of photoluminescence emission spectra of the ZnO nanostructures are ascribed to the association of different defect states due to the change of counterions. Moreover, the variation of precursor salts also influences the efficiency of Forster resonance energy transfer between the donor (ZnO) and acceptor (MB dye). ZnO with different nanostructures exhibits commendable photocatalysis degradation efficiency toward methylene blue dye (MB dye). Thus, the emission property and photocatalytic property of the ZnO nanostructures can be tuned by the variation of precursor salts. In this work, the role of counterions is established as a tool to control the ZnO nanostructures along with achieving control over the defect state emissions. This work not only establishes a relation between defects and photocatalysis, but also it deals with the variation of oxygen defects induced by the counterions of the zinc precursor salts.

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“…ZnO can be grown in various morphology nanostructures, including nanorods, 12 nanobelts, 13 nanosheets, 14 nanotubes, 15 nanoflowers, 16 nanodisks, 17 amongst others.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrocatalytic Degradation of Methylene Blue Using ZnO Nanorods Fabricated on Silicon Substrates

Rosa

Cavalcante

Silva

et al. 2020

j nanosci nanotechnol

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ZnO nanorods were grown on silicon (Si) substrates by two techniques: (i) Chemical Bath Deposition (CBD) and (ii) a CBD seed layer combined with Carbothermal Reduction Vapor Phase Transport (CTR-VPT). The structured ZnO nanorods were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and contact angle measurments. The photoelectrochemical property of ZnO nanorods were analyzed by linear voltammetry under UV-ABC light excitation. Using the ZnO nanorod samples as photoanodes, the removal of methylene blue (MB) as a representative organic compound was studied by the photoelectrocatalytic (PEC) technique applying a potential (E) of 0.6 V. For comparison purposes, experiments were performed under the same conditions using photocatalysis (PC), direct photolysis and using samples of pure Si (support material) as working electrodes in PEC. XRD analyses of ZnO prepared by both methods showed the expected ZnO wurtzite phase and a preferred c-axial orientation in the growth of the nanorods. The presence of ZnO was further confirmed by XPS and contact angle measurements showed that ZnO grown by CBD (ZnO/CBD) had a slightly hydrophobic behavior while ZnO grown by CTR-VPT (ZnO/CTR-VPT) is hydrophilic. Both ZnO sample types were shown to be photoactive, 3 with ZnO/CBD showing higher resultant photocurrent compared to ZnO/CTR-VPT. For the degradation of MB 53% of the compound was removed using ZnO/CBD as a working electrode, while using the ZnO/CTR-VPT electrode led to a removal of 43% of MB. However, direct photolysis alone removed 39% of the MB. The lower removal of MB using ZnO/CTR-VPT samples was related to surface dissociation during the degradation process. The results show that ZnO nanorods prepared by the CBD techique are a promising photoelectrode for PEC applications. Our data also indicate that CTR-VPTgrown nanorods produce uniform nanorod arrays, but this uniform nanostructure deposit does not lead to any increase in PEC activity.

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Facile wet chemical synthesis of ZnO nanosheets: Effects of counter ions on the morphological, structural, optical and photocatalytic properties

Cited by 41 publications

References 31 publications

Recent advances in the fabrication of 2D metal oxides

Recent advances in the fabrication of 2D metal oxides

Counterion-Induced Tailoring of Energy Transfer in Hydrothermally Grown Nanostructured ZnO for Photocatalysis

Photoelectrocatalytic Degradation of Methylene Blue Using ZnO Nanorods Fabricated on Silicon Substrates

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