Green Synthesis of Nickel Oxide NPs Incorporating Carbon Dots for Antimicrobial Activities
- Etefa, Fekadu Habtamu, Menera, Jabesa Dugasa, Dejene, Birhanu Francis
- Authors: Etefa, Fekadu Habtamu , Menera, Jabesa Dugasa , Dejene, Birhanu Francis
- Date: 2023
- Subjects: Green synthesis , Carbon dots , Nickel oxide nanoparticles
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/11260/13788 , vital:79024 , DOI: https://doi.org/10.1021/acsomega.3c05204
- Description: 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.
- Full Text:
- Authors: Etefa, Fekadu Habtamu , Menera, Jabesa Dugasa , Dejene, Birhanu Francis
- Date: 2023
- Subjects: Green synthesis , Carbon dots , Nickel oxide nanoparticles
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/11260/13788 , vital:79024 , DOI: https://doi.org/10.1021/acsomega.3c05204
- Description: 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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Modification of Flexible Electrodes for P-Type (Nickel Oxide) Dye-Sensitized Solar Cell Performance Based on the Cellulose Nanofiber Film
- Etefa, Fekadu Habtamu, Vinod, Kumar, Dejene, Birhanu Francis, Efa, Tesema Mulugeta, Leta, Tesfaye Jule
- Authors: Etefa, Fekadu Habtamu , Vinod, Kumar , Dejene, Birhanu Francis , Efa, Tesema Mulugeta , Leta, Tesfaye Jule
- Date: 2023
- Subjects: Flexible electrodes , Counter electrode (CE) , Dye-sensitized solar cells , TEMPO-oxidized cellulose nanofibers
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/11260/13781 , vital:79025 , DOI: https://doi.org/10.1021/acsomega.3c00383
- Description: The preparation of flexible electrode, including working electrode (WE) and counter electrode (CE), for dye-sensitized solar cells (DSSCs) utilizing metal oxides using environmentally friendly sustainable TEMPO-oxidized cellulose nanofibers (TOCNFs) is reported in this work. A new type of flexible electrode for the DSSCs, which were made of cellulose nanofiber composites with nickel hydroxide [CNF/Ni(OH)2] substrate films and cellulose nanofiber composites with polypyrrole (CNF/PPY). Nickel hydroxide, Ni(OH)2, has been prepared hydrothermally in the presence of TOCNFs, [TOCNF@Ni(OH)2]. Similarly, the conductive polymer substrate has also been prepared from a composite consisting of TOCNF and PPY, TOCNF@ PPY film, by means of polymerization for the CE. Overall, the prepared electrodes both WE from CNF/Ni(OH)2 substrates and CE from the TOCNF@PPY substrate film were revealed as the novelty of this work and which no one has introduced previously. Although NiO nanoparticles (NPs) coated on the Ni(OH)2/TOCNF electrode also produced a good power conversion efficiency, PCE (0.75%); nevertheless, the NiO NP treatment with carbon dots boosted the efficiency up to 1.3%.
- Full Text:
- Authors: Etefa, Fekadu Habtamu , Vinod, Kumar , Dejene, Birhanu Francis , Efa, Tesema Mulugeta , Leta, Tesfaye Jule
- Date: 2023
- Subjects: Flexible electrodes , Counter electrode (CE) , Dye-sensitized solar cells , TEMPO-oxidized cellulose nanofibers
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/11260/13781 , vital:79025 , DOI: https://doi.org/10.1021/acsomega.3c00383
- Description: The preparation of flexible electrode, including working electrode (WE) and counter electrode (CE), for dye-sensitized solar cells (DSSCs) utilizing metal oxides using environmentally friendly sustainable TEMPO-oxidized cellulose nanofibers (TOCNFs) is reported in this work. A new type of flexible electrode for the DSSCs, which were made of cellulose nanofiber composites with nickel hydroxide [CNF/Ni(OH)2] substrate films and cellulose nanofiber composites with polypyrrole (CNF/PPY). Nickel hydroxide, Ni(OH)2, has been prepared hydrothermally in the presence of TOCNFs, [TOCNF@Ni(OH)2]. Similarly, the conductive polymer substrate has also been prepared from a composite consisting of TOCNF and PPY, TOCNF@ PPY film, by means of polymerization for the CE. Overall, the prepared electrodes both WE from CNF/Ni(OH)2 substrates and CE from the TOCNF@PPY substrate film were revealed as the novelty of this work and which no one has introduced previously. Although NiO nanoparticles (NPs) coated on the Ni(OH)2/TOCNF electrode also produced a good power conversion efficiency, PCE (0.75%); nevertheless, the NiO NP treatment with carbon dots boosted the efficiency up to 1.3%.
- Full Text:
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