Optimized green synthesis of ZnO nanoparticles: evaluation of structural, morphological, vibrational and optical properties

Almarhoon, Zainab M.; Indumathi, T.; Kumar, Е. Ranjith

doi:10.1007/s10854-022-09125-5

Cited by 11 publications

(5 citation statements)

References 35 publications

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“…The Tauc plot was used to determine the optical bandgap energy (E g ) as 3.11 eV (Figure 1A) for the Semal-ZnO NPs. The bandgap value (E g ) for the green synthesized Semal-ZnO NPs was in good agreement with the values of 2.88 and 3.10 eV (Ekennia et al, 2021); 3.10, 3.12, and 3.07 eV (Almarhoon et al, 2022); and 3.26 and 3.3 eV (Alharthi et al, 2020) noted in literature using the equations E g = (hc/ʎ)*eV and E g = (1240/ ʎ)*eV, where E g is the bandgap energy (eV), h is Planck's constant (6.626 × 10 -34 Js), c is the velocity of light in vacuum (3 × 10 8 m/s), and λ is the wavelength (nm) (Tauc et al, 1966).…”

Section: Optical Studiessupporting

confidence: 84%

“…The agglomerated particles indicate larger sizes with low surface-to-volume ratios. The size and shape of the NPs depend upon the nature of the capping agent present in the aqueous extract of Semal leaves ( Almarhoon et al, 2022 ). The SEM-EDS examinations confirmed the purity and elemental composition of the Semal-ZnO NPs synthesized from the aqueous leaf extract of B. ceiba.…”

Section: Resultsmentioning

confidence: 99%

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Green route to fabrication of Semal-ZnO nanoparticles for efficient solar-driven catalysis of noxious dyes in diverse aquatic environments

Lal,

Gour,

Dave

et al. 2024

Front. Chem.

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This work successfully demonstrates a sustainable and environmentally friendly approach for synthesizing Semal-ZnO nanoparticles (NPs) using the aqueous leaf extract of Bombax ceiba L. These NPs exhibit an absorption peak at approximately 390 nm in the UV-visible spectrum and an energy gap (Eg) of 3.11 eV. Detailed analyses of the morphology and particle size using various spectroscopic and microscopic techniques, XRD, FE-SEM with EDS, and HR-TEM reveal crystallographic peaks attributable to the hexagonal phase, with an average crystal size of 17 nm. The Semal-ZnO NPs also exhibit a notable photocatalytic efficiency for degrading methylene blue (MB) and methyl orange (MO) under sunlight in different water samples collected from diverse natural sources, indicating that they are promising photocatalysts for environmental remediation. The photocatalytic efficiency of the biofabricated Semal-ZnO NPs is impressive, exhibiting a photodegradation rate of up to 99% for MB and 79% for MO in different water samples under exposure to sunlight. The novel phytofabricated Semal-ZnO NPs are thus a beacon of hope for the environment, with their desirable photocatalytic efficiency, pseudo-first-order kinetics, and ability to break down noxious dye pollutants in various aquatic environments.

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Section: Optical Studiessupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Green route to fabrication of Semal-ZnO nanoparticles for efficient solar-driven catalysis of noxious dyes in diverse aquatic environments

Lal,

Gour,

Dave

et al. 2024

Front. Chem.

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“…Of all the metal oxide nanomaterials currently accessible [9], zinc oxide Nanoparticles (ZnO NPs) [10] is an important material for research in a variety of applications. ZnO NPs hexagonal wurtzite structure [10] has garnered prominence as a luminescent material due to its structural [11], optical [12,13], thermal [13], electrical, and luminescence capabilities that can be used to make useful devices [14]. As nanomaterials' shape, size, and distribution-dependent capabilities, structure [13,15], or Disclaimer/Publisher's Note: The statements, opinions, and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s).…”

Section: Introductionmentioning

confidence: 99%

The Effect of Indium Tin Oxide Nanoparticles (ITO NPs) Incorporated with ZnO NPs based on Structural, Optical and Flexible Dye Sensitized Solar Cells (FDSSCs) Application

Etefa,

Dejene

2024

Preprint

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This study aimed to investigate the impact of incorporating indium tin oxide (ITO) nan particles (NPs) with zinc oxide (ZnO) NPs into flexible dye-sensitized solar cells (FDSSCs). ZnO and ITO NPs were separately prepared using the sol-gel method, followed by hybridization of ZnO NP/ITO NP and characterization using techniques such as TEM, SEM, XRD, UV-Vis spectros-copy, PL spectroscopy and cyclic voltammetry (CV). TEM analysis showed hexagonal struc-tures and small sphere-like nanoparticles with mean diameters of 15.22 ± 11 nm for ZnO NPs and 14.54 ± 16 nm for ZnO NPs/ITO NPs. SEM images revealed uniform dispersion and smooth surface morphology, while XRD confirmed the crystalline nature of both ZnO and hybrid NPs, indicating specific crystallographic planes with consistent sizes. UV-Vis spectroscopy demonstrated a redshift in wavelength upon adding ITO NPs, suggesting an impact on the bandgap of ZnO NPs. PL spectra exhibited a broad visible emission peak at 535 nm. These findings enhance our understanding of the optical behavior and interaction between ITO and ZnO NPs in hybrid nanostructures. The study concluded that the ITO NPs improve FDSSC performance by enhancing charge separation and transport, leading to increased photocurrent production, with the characterization techniques providing valuable insights for future research and applications.

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“…Such methods are often associated with inherent complexities, including the need for specialized equipment, precise control over reaction conditions, and lengthy processing times. Biosynthesis methods represent an eco-friendly and cost-effective alternative, avoiding toxic chemicals by incorporating plant extracts, such as Azadirachta Indica (Neem) or Aloe vera, as essential elements in the synthesis process [46][47][48]. The plant extract is mixed with zinc salt, and the resulting mixture is heated and stirred to obtain ZnO NPs with a particle size range of 11 nm-618 µm [46][47][48].…”

Section: Introductionmentioning

confidence: 99%

“…Biosynthesis methods represent an eco-friendly and cost-effective alternative, avoiding toxic chemicals by incorporating plant extracts, such as Azadirachta Indica (Neem) or Aloe vera, as essential elements in the synthesis process [46][47][48]. The plant extract is mixed with zinc salt, and the resulting mixture is heated and stirred to obtain ZnO NPs with a particle size range of 11 nm-618 µm [46][47][48]. However, this method requires screening microbes and plant extracts, which can be time-consuming [49].…”

Section: Introductionmentioning

confidence: 99%

Influence of pH on Room-Temperature Synthesis of Zinc Oxide Nanoparticles for Flexible Gas Sensor Applications

Mechai,

Al Shboul,

Bensidhoum

et al. 2024

Chemosensors

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This research contributes to work on synthesizing zinc oxide nanoparticles (ZnO NPs) at room temperature (RT) and their utilization in flexible gas sensors. RT ZnO NP synthesis with a basicity solution (pH ≈ 13) demonstrates an efficient method for synthesizing well-crystalline ZnO NPs (RT.pH13) comparable to those synthesized by the hydrothermal method (hyd.C). The RT.pH13 achieved a high thermal stability with minimal organic reside impurities (~4.2 wt%), 30–80 nm particle size distribution, and a specific surface area (14 m2 g−1). The synthesized pre- and post-calcinated RT.pH13 NPs were then incorporated into flexible sensors for gas sensing applications at ambient conditions (RT and relative humidity of 30–50%). The pre-calcinated ZnO-based sensor (RT.pH13) demonstrated superior sensitivity to styrene and acetic acid and lower sensitivity to dimethyl-6-octenal. The calcinated ZnO-based sensor (RT.pH13.C) exhibited lower sensitivity to styrene and acetic acid, but heightened sensitivity to benzene, acetone, and ethanol. This suggests a correlation between sensitivity and structural transformations following calcination. The investigation of the sensing mechanisms highlighted the role of surface properties in the sensors’ affinity for specific gas molecules and temperature and humidity variations. The study further explored the sensors’ mechanical flexibility, which is crucial for flexible Internet of Things (IoT) applications.

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Optimized green synthesis of ZnO nanoparticles: evaluation of structural, morphological, vibrational and optical properties

Cited by 11 publications

References 35 publications

Green route to fabrication of Semal-ZnO nanoparticles for efficient solar-driven catalysis of noxious dyes in diverse aquatic environments

Green route to fabrication of Semal-ZnO nanoparticles for efficient solar-driven catalysis of noxious dyes in diverse aquatic environments

The Effect of Indium Tin Oxide Nanoparticles (ITO NPs) Incorporated with ZnO NPs based on Structural, Optical and Flexible Dye Sensitized Solar Cells (FDSSCs) Application

Influence of pH on Room-Temperature Synthesis of Zinc Oxide Nanoparticles for Flexible Gas Sensor Applications

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