Evaluation of bi-functional applications of ZnO nanoparticles prepared by green and chemical methods

Kumar, Manjeet; Ravikumar, C.R.; Nagaswarupa, H.P.; Purshotam, B.; Gonfa, BedasaAbdisa; Murthy, H. C. Ananda; Sabir, Fedlu Kedir; Tadesse, Samson

doi:10.1016/j.jece.2019.103468

Cited by 80 publications

(32 citation statements)

References 27 publications

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“…The obtained paste was then filled into a Teflon cavity tube (surface area-0.3 mm) fabricated by our group. The surface of the packed carbon paste was then smoothened by pressing gently on a weighing paper [24].…”

Section: Preparation Of Carbon Paste Electrodementioning

confidence: 99%

Electrochemical properties of biogenic silver nanoparticles synthesized using Hagenia abyssinica (Brace) JF. Gmel. medicinal plant leaf extract

Murthy¹,

Desalegn²,

Ravikumar³

et al. 2020

Mater. Res. Express

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The biogenic/green silver nanoparticles (g-Ag NPs) were synthesised by using the extract of indigenous medicinal plant of Ethiopia, Hagenia abyssinica (Brace) JF. Gmel. leaf extract for the first time, to investigate the synergistic effect of biomolecules towards the enhancement of electrochemical properties of NPs. The synthesized g-Ag NPs were characterized by UV-visible, UV-DRS, FT-IR, XRD, SEM, EDXA, TEM, HRTEM and SAED techniques. The maximum absorbance, λ max was found to be 461 nm for g-Ag NPs due to surface plasmon resonance. The energy gap, E g of NPs, was found to be 2.31 eV. FTIR spectrum confirmed the presence of bioactive compounds responsible for possible capping and stabilisation of g-Ag NPs. The XRD analysis revealed that the g-Ag NPs are highly crystalline exhibiting sharp peaks for (111), (200), (220) and (311) planes in the diffraction pattern. SEM and TEM micrographs showed differently shaped Ag particles in addition to spherical shape. The average particle size of NPs was found to be 24.08 nm using imageJ analysis. EDX analysis confirmed the presence of Ag in the g-Ag NPs. In addition, the SAED pattern of g-Ag NPs presented concentric patterns for 4 major planes of crystalline silver. The d-spacing values of 0.2428 nm, 0.2126 nm, 0.1483 nm and 0.1263 nm corresponds to d 111 Ag, d 200 Ag, d 220 Ag and d 311 Ag lattice fringes respectively. The cyclic voltammetry (CV) results suggest that g-Ag NPs possess better electrochemical properties due to its lower charge transfer resistance value of 17 Ω. EIS studies too revealed better stability of g-Ag NPs as electrode materials.

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Section: Preparation Of Carbon Paste Electrodementioning

confidence: 99%

Electrochemical properties of biogenic silver nanoparticles synthesized using Hagenia abyssinica (Brace) JF. Gmel. medicinal plant leaf extract

Murthy¹,

Desalegn²,

Ravikumar³

et al. 2020

Mater. Res. Express

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“…Luminescence is one of the fastest-growing, and most sensitive, nondestructive techniques that help to understand point defects including extrinsic and intrinsic defects of semiconductor materials like ZnO, and TiO 2 [13,16,27,28]. ZnO with a wurtzite structure is one of the most promising n-type semiconductors for short-wavelength optoelectronic applications, displaying excellent chemical and thermal properties with a wide bandgap of 3.37 eV and high excitation binding energy of 60 meV at room temperature (RT) [12,[14][15][16]. It has attractive and novel optoelectronic properties such as high physical and chemical stability, luminescence, and superior UV emission characteristics at RT than TiO 2 [9,15,29,30].…”

Section: Of 21mentioning

confidence: 99%

“…Hence, nanosized semiconductors can act as effective photocatalysts for the degradation of various environmental pollutants (e.g., pesticides, detergents, dyes, and volatile organic compounds) in the presence of UV light and Sunlight irradiation [2,14,23,31]. To date, several methods, such as bio-treatment, incineration, ozonation, and adsorption processes based on solid adsorbents, have been utilized to treat wastewater containing pigments or dyes [15,24,32].…”

Section: Of 21mentioning

confidence: 99%

“…Metal and metal oxide NPs (MONPs) (e.g., gold, silver, nickel, copper, magnesium oxide, titanium dioxide (TiO 2 ), copper oxide, and zinc oxide (ZnO)) play a crucial role in many areas of chemistry, biomedical, and material science due to their unique physical properties, chemical reactivity, and potential applications [6][7][8][9][10][11]. Among MONPs, ZnO NPs are prominent in almost all their applicable fields, being commonly used in ceramics, electronics, cosmetics, piezoelectric transducers, chemical sensors, anti-UV additives, and photocatalysts due to their unique optical and chemical behaviors which can be simply tuned by changing their morphology [3,[12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Green Synthesis, Structural Characterization and Photocatalytic Applications of ZnO Nanoconjugates Using Heliotropium indicum

Wijesinghe¹,

Thiripuranathar²,

Menaa

et al. 2021

Catalysts

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In recent years, biosynthesized zinc oxide nanoparticles (ZnO NPs) have been gaining importance due to their unique properties and tremendous applications. This study aimed to fabricate ZnO NPs by using extracts from various parts of the traditional medicinal plant Heliotropium indicum (H. indicum) and evaluate their photocatalytic activity. Further, their potential in photoluminescence and fluorescence resonance energy transfer (FRET) was assessed. The Ultraviolet-Visible spectrum exhibited a hypsochromic shifted absorption band between 350–380 nm. Transmission electron microscopy (TEM) analysis revealed spherical NPs, while X-ray diffraction (XRD) data revealed wurtzite, hexagonal and crystalline nature. The TEM and XRD consistently determined an average particle size range from 19 to 53 nm. The photocatalytic degradation reaches a maximum of 95% for biogenic ZnO NPs by monitoring spectrophotometrically the degradation of methylene blue dye (λmax = 662.8 nm) under solar irradiation. Photoluminescence analysis revealed differentiated spectra with high-intensity emission peaks for biogenic ZnO NPs compared with chemically synthesized ZnO NPs. Eventually, the highest efficiency of FRET (80%) was found in ZnO NPs synthesized from the leaves. This remains the first report highlighting the multifunctional ZnO NPs capabilities mediated by using H. indicum, which could lead to important potential environmental and biomedical applications.

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“…The obtained paste was then filled into a Teflon cavity tube fabricated for the experimental purpose. The surface of the packed carbon paste was then levelled by pressing it gently on a weighing paper [12].…”

Section: Preparation Of Carbon Paste Electrodementioning

confidence: 99%

Synthesis and Characterization of Green CuO using Centella Asiatica Plant Leaf Extract: Electrochemical and Photocatalytic Activities

Rudresha¹,

Hussain²,

Ravikumar³

et al. 2020

Adv. Mater. Lett.

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Evaluation of bi-functional applications of ZnO nanoparticles prepared by green and chemical methods

Cited by 80 publications

References 27 publications

Electrochemical properties of biogenic silver nanoparticles synthesized using Hagenia abyssinica (Brace) JF. Gmel. medicinal plant leaf extract

Electrochemical properties of biogenic silver nanoparticles synthesized using Hagenia abyssinica (Brace) JF. Gmel. medicinal plant leaf extract

Green Synthesis, Structural Characterization and Photocatalytic Applications of ZnO Nanoconjugates Using Heliotropium indicum

Synthesis and Characterization of Green CuO using Centella Asiatica Plant Leaf Extract: Electrochemical and Photocatalytic Activities

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