Crystal structure, optical and dielectric properties of Ag:ZnO composite-like compounds

Dey, Bikash Kumar; Narzary, R.; Chouhan, L.; Bhattacharjee, Sourav; Parida, B. N.; Mondal, Arunendu; Ravi, S.; Srivastava, S. K.

doi:10.1007/s10854-021-07560-4

Cited by 23 publications

(7 citation statements)

References 70 publications

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“…In addition, the (1 1 1) reflection of Ag overlaps with the (1 0 1) reflection of anatase TiO 2. [22] Figure 4 shows the Raman spectrum of the as-prepared samples. For pure CuO nanoflowers, there were three Raman characteristic peaks at 298, 344, and 629 cm À1 , which were assigned to the peaks of CuO.…”

Section: Resultsmentioning

confidence: 99%

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Ag‐Decorated Chrysanthemum‐Like CuO–TiO₂ Thin Film: Enhanced Photocatalytic Degradation of Rhodamine B

Zhang,

Yang,

2024

Physica Status Solidi (a)

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Photocatalysis has attracted attention as a method for purifying pollutants, but how to simply and efficiently prepare catalyst films with high surface areas is still a challenge. Herein, a chrysanthemum‐like CuO–TiO2–Ag photocatalyst is prepared by anodic oxidation and magnetron sputtering. Scanning electron microscopy and energy dispersive spectrometry analyses show that Ag nanoparticles are uniformly modified on the surface of chrysanthemum‐like CuO–TiO2. Moreover, the influences of the thickness of the TiO2 film and the content of Ag nanoparticles on the degradation of rhodamine B (RhB) are studied by controlling the sputtering time. Among the prepared nanocomposites, the chrysanthemum‐like CuO–TiO2‐2.5‐Ag‐2 proves to have the maximal degradation level with regard to RhB by removing 91.16% RhB after 120 min under UV light. This is because the large surface area offers more active sites. In addition, the trapping experiments show that when CuO–TiO2 is decorated by Ag nanoparticles, this contributes to the movement of a number of photogenerated electrons from the conduction band of TiO2 to Ag, thereby improving the efficiency of charge transfer. The findings reveal that the photodegradation efficiency of the prepared nanocomposites in this study is greatly related to the thickness of the TiO2 film and the content of Ag nanoparticles.

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Section: Resultsmentioning

confidence: 99%

“…In addition, the (1 1 1) reflection of Ag overlaps with the (1 0 1) reflection of anatase TiO 2. [ 22 ]…”

Section: Resultsmentioning

confidence: 99%

Ag‐Decorated Chrysanthemum‐Like CuO–TiO₂ Thin Film: Enhanced Photocatalytic Degradation of Rhodamine B

Zhang,

Yang,

2024

Physica Status Solidi (a)

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“…600 nm (arising from exciton A and B transitions), while for ZnO, the absorption peaks are found at 450 nm. After mixing the composite, we found that the MOS 2 /ZnO mix exhibits stronger absorption ability than pristine MoS 2 , suggesting that the heterostructure has more intensive light-matter interaction. ,,, In Figure b, a graph depicting the relationship between the photon energy h ν (eV) and (ν* h ν) 1/ n was plotted, where n is a constant that relates to various electronic transition types ( n = 3 for indirect forbidden transitions, n = 2 for indirect allowed, n = 3/2 for direct forbidden, and n = 1/2 for direct allowed). α false( λ false) = 2.303 log ⁡ A false( λ false) T where α stands for the absorbance coefficient, A represents the absorbance, and T represents the sample’s thickness. ,− A linear fit to this data reveals that the absorption band edge shifts to the red shift by about 0.2 eV from 3.1 eV for ZnO to 2.9 eV for ZnO/MoS 2 . This redshift possibly occurs from an increase in AgNPs electron density which changes the reflective index of the nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

Dichalcogenide and Metal Oxide Semiconductor-Based Composite to Support Plasmonic Catalysis

et al. 2023

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Nanocomposites comprising plasmon active metal nanostructures and semiconductors have been used to control the charge states in the metal to support catalytic activity. In this context dichalcogenides when combined with metal oxides offer the potential to control charge states in plasmonic nanomaterials. Using a model plasmonic mediated oxidation reaction p-amino thiophenol ↔ p-nitrophenol, we show that through the introduction of transition metal dichalcogenide nanomaterial, reaction outcomes can be influenced, achieved through controlling the occurrence of the reaction intermediate dimercaptoazobenzene by opening new electron transfer routes in a semiconductor-plasmonic system. This study demonstrates the ability to control plasmonic reactions by carefully controlling the choice of semiconductors.

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“…31,34 Further, the intensity of the peaks corresponding to metallic Ag also increases for the sample with increasing Ag concentration, resulting in the formation of Ag NCs. 9,28,31,35 Such an intensity increase of the Ag(111) peak suggests that the Ag NCs develop a more ordered and well-defined crystalline structure, whereas the ZnO host NPs may exhibit a lower degree of crystallinity. Similar results were observed by Gupta et al, 31 in the case of Ag-embedded ZnO nanocomposites.…”

Section: Characterization Of Zno/ag Nanohybridsmentioning

confidence: 99%

Sensitive, Stable, and Recyclable ZnO/Ag Nanohybrid Substrates for Surface-Enhanced Raman Scattering Metrology

Samriti,

Kumar,

Kuznetsov

et al. 2024

ACS Mater. Au

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Surface-enhanced Raman scattering is a practical, noninvasive spectroscopic technique that measures chemical fingerprints for varieties of molecules in multiple applications. However, synthesizing appropriate substrates for practical, longterm applications of this method has always been a challenging task. In the present study, we show that ZnO/Ag nanohybrid substrates may act as highly stable, sensitive, and recyclable substrates for surface-enhanced Raman scattering, as illustrated by the detection of methylene blue, selected as a test dye molecule with self-cleaning functionalities. Specifically, we demonstrate the detection enhancement factor of 3.7 × 10 7 along with exceptional long-term stability explained in terms of the localized surface plasmon resonance from the Ag nanocrystals embedded into the chemically inert ZnO nanoparticles, constituting the nanohybrid. Significantly, these substrates can be efficiently cleaned and regenerated while maintaining their high performance upon recycling. As a result, using these substrates, up to 10 −12 M detection sensitivity has been demonstrated, enabling the accuracy required in modern environmental monitoring, bioassays, and analytical chemistry. Thus, ZnO nanoparticles with embedded Ag nanocrystals constitute a novel class of advanced nanohybrid substrates for use in multiple applications of surface-enhanced Raman scattering metrology.

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Crystal structure, optical and dielectric properties of Ag:ZnO composite-like compounds

Cited by 23 publications

References 70 publications

Ag‐Decorated Chrysanthemum‐Like CuO–TiO₂ Thin Film: Enhanced Photocatalytic Degradation of Rhodamine B

Ag‐Decorated Chrysanthemum‐Like CuO–TiO₂ Thin Film: Enhanced Photocatalytic Degradation of Rhodamine B

Dichalcogenide and Metal Oxide Semiconductor-Based Composite to Support Plasmonic Catalysis

Sensitive, Stable, and Recyclable ZnO/Ag Nanohybrid Substrates for Surface-Enhanced Raman Scattering Metrology

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Crystal structure, optical and dielectric properties of Ag:ZnO composite-like compounds

Cited by 23 publications

References 70 publications

Ag‐Decorated Chrysanthemum‐Like CuO–TiO2 Thin Film: Enhanced Photocatalytic Degradation of Rhodamine B

Ag‐Decorated Chrysanthemum‐Like CuO–TiO2 Thin Film: Enhanced Photocatalytic Degradation of Rhodamine B

Dichalcogenide and Metal Oxide Semiconductor-Based Composite to Support Plasmonic Catalysis

Sensitive, Stable, and Recyclable ZnO/Ag Nanohybrid Substrates for Surface-Enhanced Raman Scattering Metrology

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Product

Resources

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Ag‐Decorated Chrysanthemum‐Like CuO–TiO₂ Thin Film: Enhanced Photocatalytic Degradation of Rhodamine B

Ag‐Decorated Chrysanthemum‐Like CuO–TiO₂ Thin Film: Enhanced Photocatalytic Degradation of Rhodamine B