Solvent assisted evolution and growth mechanism of zero to three dimensional ZnO nanostructures for dye sensitized solar cell applications

Ramya, M.; Nideep, T. K.; Nampoori, V. P. N.; Kailasnath, M.

doi:10.1038/s41598-021-85701-9

Cited by 39 publications

(15 citation statements)

References 51 publications

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“…Panel h displays the high-resolution transmission electron micrograph of the ZnO nanostructures (set E); the lattice fringes of 0.26 nm for the (002) plane of wurtzite-type hexagonal ZnO confirm the crystalline nature of the particles . The corresponding selected area electron diffraction pattern (panel i) of ZnO particles (set E) exhibits the appearance of polycrystalline-like diffraction, which is consistent with reflections (100), (002), (101), (102), and (110) corresponding to the crystallographic orientations of the hexagonal wurtzite phase of the nanostructures …”

Section: Results and Discussionmentioning

confidence: 57%

Critical Crystallographic Transition in Violation of Kasha’s Rule of Size-Specific ZnO Quantum Dots

Debnath

Pal

Chatterjee

et al. 2023

Crystal Growth & Design

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Investigation of the intrinsic relationship between crystallography and electronic properties may provide an avenue to unravel the photophysical aspects of semiconductor nanostructures. Since the 1980s, semiconducting materials at the nanoscale dimensions have been of immense scientific interest because of the unique quantum characteristics beyond a particular size limit. Prudent advances in the synthetic strategies of naked ZnO quantum dots have offered the opportunity to imbue the structure−property relationship of nanostructured systems. Seven size-specific ZnO nanospheres have been synthesized through alkaline hydrolysis of the precursor salt in the presence of alcohol in the reaction medium. The photoluminescence behavior of colloidal dispersion of ZnO nanoparticles has been studied as a function of excitation wavelength with a periodic interval of 10 nm in the range of 290−430 nm. It has been observed that changes in the excitation wavelength shift the emission spectrum in a regular manner independent of the size of ZnO particles under investigation. The empirical proposition in the framework of Kasha's rule has been established as a milestone of spectroscopy, being validated in tens of thousands of fluorophore systems; meanwhile, although obscure, anomalous cases have also been observed both in molecular and nanoscale systems. Crystallographic analysis has shown that there occurs a structural transition that determines the localization of electronic energy levels in the experimental size range of the ZnO particles. Therefore, the salient feature of physical significance is that crystallographic transition appears to exhibit the excitation wavelength-dependent shift of the photoluminescence maximum and is therefore the violation of Kasha's rule for the ZnO quantum dots.

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Section: Results and Discussionmentioning

confidence: 57%

Critical Crystallographic Transition in Violation of Kasha’s Rule of Size-Specific ZnO Quantum Dots

Debnath

Pal

Chatterjee

et al. 2023

Crystal Growth & Design

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show abstract

“…In the final stage, ZnO was formed with the preferential growth in the (101) direction, which might be due to its fastest growth compared to the other growth directions [43]. Therefore, the intertwined nanosheet structures were formed when the Al ratios increased from 1 wt % to 3 wt %.…”

Section: Resultsmentioning

confidence: 99%

Effect of Aluminum Doping Ratios on the Properties of Aluminum-Doped Zinc Oxide Films Deposited by Mist Chemical Vapor Deposition Method Applying for Photocatalysis

Wai

2022

Nanomaterials

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Aluminum-doped zinc oxide film was deposited on a glass substrate by mist chemical vapor deposition method. The influence of different aluminum doping ratios on the structural and optical properties of zinc oxide film was investigated. The XRD results revealed that the diffraction peak of (101) crystal plane was the dominant peak for the deposited AZO films with the Al doping ratios increasing from 1 wt % to 3 wt %. It was found that the variation of AZO film structures was strongly dependent on the Al/Zn ratios. The intertwined nanosheet structures were obtained when Zn/O ratios were greater than Al/O ratios with the deposition temperature of 400 °C. The optical transmittance of all AZO films was greater than 80% in the visible region. The AZO film deposited with Al doping ratio of 2 wt % showed the highest photocatalytic efficiency between the wavelength of 475 nm and 700 nm, with the high first-order reaction rate of 0.004 min−1 under ultraviolet radiation. The mechanism of the AZO film influenced by aluminum doping ratio during mist chemical vapor deposition process was revealed.

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“…The solvents showed a remarkable influence on the conversion performance of CeCoO 3 /MoS 2 heterostructures by energy transfer, particle polarization, and scattering. [ 61 ] In Figure 6a, water demonstrates the highest conversion rate of MB, whereas chloroform showed the minimum percentage.…”

Section: Resultsmentioning

confidence: 99%

Enhanced photocatalytic conversion of organic dyes using CeCoO₃/MoS₂ heterojunction as a highly effective visible‐light‐driven photocatalyst

Ghobadifard

Feizi

Mohebbi

2022

Applied Organom Chemis

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The CeCoO3/MoS2 heterojunction was successfully prepared through the hydrothermal method. The synthesized heterojunction structure was characterized by various techniques and applied to the conversion of methylene blue (MB) under irradiation of visible light. To characterize the new heterojunction structure, Fourier transformed infrared (FT‐IR), field emission scanning electron microscope (FE‐SEM), energy‐dispersive X‐ray spectroscopy (EDXS), X‐ray diffraction (XRD), photoluminescence spectroscopy (PL), differential reflectance spectroscopy (DRS), and transmission electron microscopy (TEM) analyses were used. The FE‐SEM images illustrated the successful deposition of MoS2 flower‐like on the surface of CeCoO3 perovskite with 46 nm as an average size. The influence of the amount of catalyst, temperature, pH, and electron acceptor were investigated. By CeCoO3/MoS2 heterostructures photocatalyst, the conversion rate of MB reached 98% within 20 min, whereas by CeCoO3 perovskite no significant conversion was observed in MB. The higher photocatalytic performance of CeCoO3/MoS2 heterostructures is assigned to their lower charge recombination compared to CeCoO3 perovskite. Moreover, the photocatalytic mechanism and recycling experiments of CeCoO3/MoS2 heterostructures are discussed in detail. The CeCoO3/MoS2 heterostructures are thus promising photocatalysts for the cleanup of polluted water.

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Solvent assisted evolution and growth mechanism of zero to three dimensional ZnO nanostructures for dye sensitized solar cell applications

Cited by 39 publications

References 51 publications

Critical Crystallographic Transition in Violation of Kasha’s Rule of Size-Specific ZnO Quantum Dots

Critical Crystallographic Transition in Violation of Kasha’s Rule of Size-Specific ZnO Quantum Dots

Effect of Aluminum Doping Ratios on the Properties of Aluminum-Doped Zinc Oxide Films Deposited by Mist Chemical Vapor Deposition Method Applying for Photocatalysis

Enhanced photocatalytic conversion of organic dyes using CeCoO₃/MoS₂ heterojunction as a highly effective visible‐light‐driven photocatalyst

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Solvent assisted evolution and growth mechanism of zero to three dimensional ZnO nanostructures for dye sensitized solar cell applications

Cited by 39 publications

References 51 publications

Critical Crystallographic Transition in Violation of Kasha’s Rule of Size-Specific ZnO Quantum Dots

Critical Crystallographic Transition in Violation of Kasha’s Rule of Size-Specific ZnO Quantum Dots

Effect of Aluminum Doping Ratios on the Properties of Aluminum-Doped Zinc Oxide Films Deposited by Mist Chemical Vapor Deposition Method Applying for Photocatalysis

Enhanced photocatalytic conversion of organic dyes using CeCoO3/MoS2 heterojunction as a highly effective visible‐light‐driven photocatalyst

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Enhanced photocatalytic conversion of organic dyes using CeCoO₃/MoS₂ heterojunction as a highly effective visible‐light‐driven photocatalyst