ZnO and Ag NP-decorated ZnO nanoflowers: green synthesis using <i>Ganoderma lucidum</i> aqueous extract and characterization

Smirnov, Oleksandr; Dzhagan, Volodymyr; Kovalenko, Mariia; Gudymenko, O.; Dzhagan, Veronika; Mazur, Nazar; Ісаєва, Оксана; Maksimenko, Z.V.; Кондратенко, С. В.; Skoryk, Mykola; Yukhymchuk, Volodymyr

doi:10.1039/d2ra05834k

Cited by 6 publications

(3 citation statements)

References 56 publications

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“…The data collection time at one point was 1 s. The phase concentration was determined through a full profile analysis with the Rietveld approach, using High Score Plus software [ 36 ]. The average level of deformations ε in the direction of the main optical axis c were determined from the angular positions and half-widths of the reflections (001)\(002) and (100)\(200) using the Williamson–Hall method [ 37 , 38 ]. The size of the coherent scattering region D was assessed with the same methodology.…”

Section: Methodsmentioning

confidence: 99%

Enhancement of the Refractory Matrix Diamond-Reinforced Cutting Tool Composite with Zirconia Nano-Additive

Ratov,

Mechnik,

Rucki

et al. 2024

Materials

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This paper presents the results of the experimental research on diamond-reinforced composites with WC–Co matrices enhanced with a ZrO2 additive. The samples were prepared using a modified spark plasma sintering method with a directly applied alternating current. The structure and performance of the basic composite 94 wt.%WC–6 wt.%Co was compared with the ones with ZrO2 added in proportions up to 10 wt.%. It was demonstrated that an increase in zirconia content contributed to the intense refinement of the phase components. The composite 25 wt.%Cdiamond–70.5 wt.%WC–4.5 wt.%Co consisted of a hexagonal WC phase with lattice parameters a = 0.2906 nm and c = 0.2837 nm, a cubic phase (a = 1.1112 nm), hexagonal graphite phase (a = 0.2464 nm, c = 0.6711 nm), as well as diamond grits. After the addition of zirconia nanopowder, the sintered composite contained structural WC and Co3W3C phases, amorphous carbon, tetragonal phase t-ZrO2 (a = 0.36019 nm, c = 0.5174 nm), and diamond grits—these structural changes, after an addition of 6 wt.% ZrO2 contributed to an increase in the fracture toughness by more than 20%, up to KIc = 16.9 ± 0.76 MPa·m0.5, with a negligible decrease in the hardness. Moreover, the composite exhibited an alteration of the destruction mechanism after the addition of zirconia, as well as enhanced forces holding the diamond grits in the matrix.

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Section: Methodsmentioning

confidence: 99%

Enhancement of the Refractory Matrix Diamond-Reinforced Cutting Tool Composite with Zirconia Nano-Additive

Ratov,

Mechnik,

Rucki

et al. 2024

Materials

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“…Although the best control over the uniformity of the metal nanostructures on the surface and the magnitude of the interparticle distance can be achieved with electron beam lithography, this method is not viable for real-life applications because of the relatively high price. More affordable are methods based on prepatterning ,− or controlled nucleation of the metallic nanostructures on the surface or methods based on self-assembling. ,, In the case of self-assembling, the desired morphology can be formed by an oxide or other nonexpensive material and then covered with noble metal. − Alternatively, the hybrid nanostructures with predefined morphology and plasmonic properties can be first prepared in the solutions and then self-assembled on the substrate to form the hot spots between them. ,− In most approaches, preparation of efficient and rigid SERS substrates requires sophisticated and skilled preparation (in the case of nanosphere lithography, for instance) or costly equipment and materials (as in the case of lithographic methods). , Therefore, affordable fabrication of efficient SERS substrates is still an area of intense research. ,,,− Of particular interest is developing plasmonic architectures that could enable (self-)localization of the analyte in the hot spots …”

Section: Introductionmentioning

confidence: 99%

“… 35 , 55 Therefore, affordable fabrication of efficient SERS substrates is still an area of intense research. 7 , 9 , 42 , 55 − 66 Of particular interest is developing plasmonic architectures that could enable (self-)localization of the analyte in the hot spots. 67 …”

Section: Introductionmentioning

confidence: 99%

Self-Organized SERS Substrates with Efficient Analyte Enrichment in the Hot Spots

Dzhagan,

Mazur,

Kapush

et al. 2024

ACS Omega

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One of the requirements of an efficient surface-enhanced Raman spectroscopy (SERS) substrate is a developed surface morphology with a high density of "hot spots", nm-scale spacings between plasmonic nanoparticles. Of particular interest are plasmonic architectures that could enable self-localization (enrichment) of the analyte in the hot spots. We report a straightforward method of fabrication of efficient SERS substrates that comply with these requirements. The basis of the substrate is a large-area film of tightly packed SiO 2 spheres formed by their quick self-assembling upon drop casting from the solution. Thermally evaporated thin Ag layer is converted by quick thermal annealing into nanoparticles (NPs) selfassembled in the trenches between the silica spheres, i.e., in the places where the analyte molecules get localized upon deposition from solution and drying. Therefore, the obtained substrate morphology enables an efficient enrichment of the analyte in the hot spots formed by the densely arranged plasmonic NPs. The high efficiency of the developed SERS substrates is demonstrated by the detection of Rhodamine 6G down to 10 −13 mol/L with an enhancement factor of ∼10 8 , as well as the detection of low concentrations of various nonresonant analytes, both small dye molecules and large biomolecules. The developed approach to SERS substrates is very straightforward for implementation and can be further extended to using gold or other plasmonic NPs.

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SERS application of Ag nanoparticles synthesized with aqueous fungi extract

et al. 2023

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ZnO and Ag NP-decorated ZnO nanoflowers: green synthesis using Ganoderma lucidum aqueous extract and characterization

Abstract: Fungi and plants produce and excrete various proteins, enzymes, polysaccharides, and secondary metabolites, which may be used as media for the “green” synthesis of metal and semiconductor nanoparticles (NPs).

Cited by 6 publications

References 56 publications

Enhancement of the Refractory Matrix Diamond-Reinforced Cutting Tool Composite with Zirconia Nano-Additive

Enhancement of the Refractory Matrix Diamond-Reinforced Cutting Tool Composite with Zirconia Nano-Additive

Self-Organized SERS Substrates with Efficient Analyte Enrichment in the Hot Spots

SERS application of Ag nanoparticles synthesized with aqueous fungi extract

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