Hybrid
            <scp>1D</scp>
            Semiconducting
            <scp>ZnO</scp>
            and
            <scp>GaN</scp>
            Nanostructures for Light‐Emitting Devices

Kumar, Vijay; Etefa, Habtamu F.; Efa, Mulugeta T.; Jule, Leta Tesfaye

doi:10.1002/9783527837649.ch9

Cited by 5 publications

(4 citation statements)

References 49 publications

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“…Finally, for the synthesis of the nanocomposite and characterizations, the synthesized nanoparticles were carefully placed in the sample holder. In this work, C-dots were prepared from o -phenylenediamine ( o -OPD) and citric acid, according to the reported method and procedure . The nanocomposites of the titled compounds were also synthesized according to the existing method and procedure …”

Section: Methodsmentioning

confidence: 99%

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Green Synthesis of Nickel Oxide NPs Incorporating Carbon Dots for Antimicrobial Activities

Etefa,

Nemera,

Dejene

2023

ACS Omega

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A biosynthesis composite using the green synthesis of titled metal nanoparticles (nickel oxide nanoparticles, NiO NPs, and carbon dots, C-dots) was produced, characterized, and then applied for antimicrobial activities. NiO NPs were produced using the Croton macrostachyus (Bakkannisa) plant leaf extract and nickel nitrate (III) hexahydrate [Ni(NO3)2·2H2O] as precursors, while C-dots were produced using citric acid and o-phenylenediamine (o-OPD). The distribution of the average particle size of the NiO NPs and NiO NPs@C-dots was 25.34 ± 0.12 and 24.95 ± 0.22 nm, respectively. The antimicrobial effects of the prepared materials were tested against the selected bacterial and fungal strains. Based on the outcomes of the bioassay, it was realized that both the bare and composite materials were effective against all bacterial strains. The composite’s high surface area with strong inhibitive effective antimicrobial effects against bacterial and fungal strains were observed. Therefore, strong inhibitive effects of 21–24 and 22–26 mm were observed with NiO NPs and NiO NPs@C-dots, respectively.

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Section: Methodsmentioning

confidence: 99%

“…In this work, C-dots were prepared from o -phenylenediamine ( o -OPD) and citric acid, according to the reported method and procedure. 49 The nanocomposites of the titled compounds were also synthesized according to the existing method and procedure. 50 …”

Section: Methodsmentioning

confidence: 99%

Green Synthesis of Nickel Oxide NPs Incorporating Carbon Dots for Antimicrobial Activities

Etefa,

Nemera,

Dejene

2023

ACS Omega

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“…Because of its outstanding optical properties, C-dots have been developed to replace expensive, heavy-metal-based fluorophores in some photovoltaic solar cells 2 [21]. Various C-dots are also used as doping into the photoanode, counter electrode, hole transport layer, and electron transport layer of dye-sensitized solar cells (DSSC) [22][23][24][25]. Furthermore, many C-dots advantages have recently been reported about their own distinguishing characteristics over other C-dots materials (for example, the crystallinity of the core determines the presence (or absence) of quantum confinement in C-dots, where quantum confinement is identified in C-dots with a crystalline core but not in C-dots with an amorphous core) [8,26,27].…”

Section: Introductionmentioning

confidence: 99%

Carbon Dots for Future Prospects: Synthesis, Characterizations and Recent Applications: A Review (2019–2023)

Etefa,

Tessema,

Dejene

2024

Preprint

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Nanotechnology sparks discussions and concerns about the impacts of new nanomaterials on health and the environment. It holds importance in various domains due to its unique struc-tures. Carbon dots (C-dots) are versatile nanomaterials with applications in bioimaging, sensing, catalysis, polymers, solar cells, and more. They offer desirable characteristics such as stability, cost-effectiveness, biocompatibility, and high photoluminescent quantum yield. C-dots have the potential to replace expensive fluorophores in solar cells. They are catego-rized as carbon quantum dots, graphene quantum dots, and carbonized polymer dots. C-dots have outstanding optical and photoelectric properties with low toxicity. Bottom-up and top-down approaches are used for the synthesis of carbon dots (CDs), with each method im-pacting their physicochemical characteristics. The choice of synthesis method depends on de-sired properties and application requirements. Researchers combine these methods and ex-plore new approaches to enhance synthesis efficiency and tailor CD properties. CDs have di-verse chemical structures with modified oxygen, polymer-based, or amino groups on their surface. Various characterization methods such as HRTEM, XPS, and optical analysis (PL, UV) are used to determine CD structure. Carbon dots (CDs) are cutting-edge fluorescent nano-materials with remarkable qualities such as biocompatibility, low toxicity, environmental friendliness, high water solubility, and photo-stability. They are easily adjustable in terms of their optical properties, making them highly versatile in various fields. CDs find applications in bio-imaging, nanomedicine, drug delivery, solar cells, LEDs, photo-catalysis, elec-tro-catalysis, and other related areas.

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“…Of all the methods mentioned above, sol-gel is an excellent choice for producing ZnO NPs [22] due to its ease of modification and affordability [23]. The use of this process for nanoparticle production offers several advantages, including shorter production times and lower operating temperatures compared to alternative methods.…”

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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Hybrid 1D Semiconducting ZnO and GaN Nanostructures for Light‐Emitting Devices

Cited by 5 publications

References 49 publications

Green Synthesis of Nickel Oxide NPs Incorporating Carbon Dots for Antimicrobial Activities

Green Synthesis of Nickel Oxide NPs Incorporating Carbon Dots for Antimicrobial Activities

Carbon Dots for Future Prospects: Synthesis, Characterizations and Recent Applications: A Review (2019–2023)

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

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