Charge Ordering in Cobalt Oxides: Impact on Structure, Magnetic and Transport Properties

Raveau, B.; Seikh, Md. Motin

doi:10.1002/zaac.201500085

Cited by 20 publications

(13 citation statements)

References 91 publications

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“…Cobalt has unique catalytic, electrical, and optical properties that make it favorable for a vast range of applications involving catalysts, nano-electronic devices, and nano-sensors [335]. Cobalt can show variable oxidation states, e.g., CO 4+ , CO 3+ , and CO 2+ , that make it favorable to be utilized in various fields [336]. Now, cobalt nanoparticles have attracted remarkable interest because they are cheaper than other metal or metal oxide nanoparticles and exhibit various properties, e.g., magnetic and electrical, because of their huge surface area [337,338].…”

Section: Cobalt and Cobalt Oxide Nanoparticlesmentioning

confidence: 99%

Green Synthesis of Metal and Metal Oxide Nanoparticles Using Different Plants’ Parts for Antimicrobial Activity and Anticancer Activity: A Review Article

et al. 2021

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Nanotechnology emerged as a scientific innovation in the 21st century. Metallic nanoparticles (metal or metal oxide nanoparticles) have attained remarkable popularity due to their interesting biological, physical, chemical, magnetic, and optical properties. Metal-based nanoparticles can be prepared by utilizing different biological, physical, and chemical methods. The biological method is preferred as it provides a green, simple, facile, ecofriendly, rapid, and cost-effective route for the green synthesis of nanoparticles. Plants have complex phytochemical constituents such as carbohydrates, amino acids, phenolics, flavonoids, terpenoids, and proteins, which can behave as reducing and stabilizing agents. However, the mechanism of green synthesis by using plants is still highly debatable. In this report, we summarized basic principles or mechanisms of green synthesis especially for metal or metal oxide (i.e., ZnO, Au, Ag, and TiO2, Fe, Fe2O3, Cu, CuO, Co) nanoparticles. Finally, we explored the medical applications of plant-based nanoparticles in terms of antibacterial, antifungal, and anticancer activity.

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Section: Cobalt and Cobalt Oxide Nanoparticlesmentioning

confidence: 99%

Green Synthesis of Metal and Metal Oxide Nanoparticles Using Different Plants’ Parts for Antimicrobial Activity and Anticancer Activity: A Review Article

et al. 2021

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“…These methods also use toxic chemicals, are expensive and time-consuming, whereas the biological approach uses various biotic resources such as plants, algae, microorganisms, and other biological molecules like starch, egg albumin, and gelatin for the production of different types of NPs. This biological approach is also known as the green approach [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. This method is eco-friendly, simple, reliable, biocompatible, and easy for the synthesis of NPs.…”

Section: Synthesis Of Npsmentioning

confidence: 99%

“…Cobalt has unique magnetic, optical, electrical, and catalytic characteristics that make it suitable for a wide range of applications in the field of nanoelectronics and nanosensors [ 7 , 8 , 9 ]. Cobalt can exhibit variable oxidation states (Co 2+ , Co 3+ , and Co 4+ ), which makes it attractive to be used in several industries [ 10 ]. Because of this multivalent state, cobalt has the ability to be present in different spin states in its oxide forms, i.e., low, intermediate, and high [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

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Green fabrication of Co and Co₃O₄ nanoparticles and their biomedical applications: A review

et al. 2021

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Nanotechnology is the fabrication, characterization, and potential application of various materials at the nanoscale. Over the past few decades, nanomaterials have attracted researchers from different fields because of their high surface-to-volume ratio and other unique and remarkable properties. Cobalt and cobalt oxide nanoparticles (NPs) have various biomedical applications because of their distinctive antioxidant, antimicrobial, antifungal, anticancer, larvicidal, antileishmanial, anticholinergic, wound healing, and antidiabetic properties. In addition to biomedical applications, cobalt and cobalt oxide NPs have been widely used in lithium-ion batteries, pigments and dyes, electronic thin film, capacitors, gas sensors, heterogeneous catalysis, and for environmental remediation purposes. Different chemical and physical approaches have been used to synthesize cobalt and cobalt oxide NPs; however, these methods could be associated with eco-toxicity, cost-effectiveness, high energy, and time consumption. Recently, an eco-friendly, safe, easy, and simple method has been developed by researchers, which uses biotic resources such as plant extract, microorganisms, algae, and other biomolecules such as starch and gelatin. Such biogenic cobalt and cobalt oxide NPs offer more advantages over other physicochemically synthesized methods. In this review, we have summarized the recent literature for the understanding of green synthesis of cobalt and cobalt oxide NPs, their characterization, and various biomedical applications.

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“…Moreover, even simple stoichiometric CoO have shown promising potential for inducing CO 29 . The CO cobaltates shows various technological important electronic properties 30 . Therefore, it is desirable to exploit the cobaltates by engineering CO even in the simple stoichiometric cobaltates.…”

Section: Introductionmentioning

confidence: 99%

Coexisting commensurate and incommensurate charge ordered phases in CoO

Negi

Singh

Ahuja

et al. 2021

Sci Rep

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The subtle interplay of strong electronic correlations in a distorted crystal lattice often leads to the evolution of novel emergent functionalities in the strongly correlated materials (SCM). Here, we unravel such unprecedented commensurate (COM) and incommensurate (ICOM) charge ordered (CO) phases at room temperature in a simple transition-metal mono-oxide, namely CoO. The electron diffraction pattern unveils a COM ($$q_{1}$$ q 1 =$$\frac{1}{2}(1,1,{\bar{1}})$$ 1 2 ( 1 , 1 , 1 ¯ ) and ICOM ($$q_{2}=0.213(1,1,{\bar{1}})$$ q 2 = 0.213 ( 1 , 1 , 1 ¯ ) ) periodic lattice distortion. Transmission electron microscopy (TEM) captures unidirectional and bidirectional stripe patterns of charge density modulations. The widespread phase singularities in the phase-field of the order parameter (OP) affirms the abundant topological disorder. Using, density functional theory (DFT) calculations, we demystify the underlying electronic mechanism. The DFT study shows that a cation disordering ($$\mathrm {Co}_{1-\textit{x}}\mathrm {O}, \text {with }{} \textit{x} = 4.17 \%$$ Co 1 - x O , with x = 4.17 % ) stabilizes Jahn-Teller (JT) distortion and localized aliovalent $$\mathrm {Co}^{3+}$$ Co 3 + states in CoO. Therefore, the lattice distortion accompanied with mixed valence states ($$\mathrm {Co}^{3+}, \mathrm {Co}^{2+}$$ Co 3 + , Co 2 + ) states introduces CO in CoO. Our findings offer an electronic paradigm to engineer CO to exploit the associated electronic functionalities in widely available transition-metal mono-oxides.

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Charge Ordering in Cobalt Oxides: Impact on Structure, Magnetic and Transport Properties

Cited by 20 publications

References 91 publications

Green Synthesis of Metal and Metal Oxide Nanoparticles Using Different Plants’ Parts for Antimicrobial Activity and Anticancer Activity: A Review Article

Green Synthesis of Metal and Metal Oxide Nanoparticles Using Different Plants’ Parts for Antimicrobial Activity and Anticancer Activity: A Review Article

Green fabrication of Co and Co₃O₄ nanoparticles and their biomedical applications: A review

Coexisting commensurate and incommensurate charge ordered phases in CoO

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Charge Ordering in Cobalt Oxides: Impact on Structure, Magnetic and Transport Properties

Cited by 20 publications

References 91 publications

Green Synthesis of Metal and Metal Oxide Nanoparticles Using Different Plants’ Parts for Antimicrobial Activity and Anticancer Activity: A Review Article

Green Synthesis of Metal and Metal Oxide Nanoparticles Using Different Plants’ Parts for Antimicrobial Activity and Anticancer Activity: A Review Article

Green fabrication of Co and Co3O4 nanoparticles and their biomedical applications: A review

Coexisting commensurate and incommensurate charge ordered phases in CoO

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Green fabrication of Co and Co₃O₄ nanoparticles and their biomedical applications: A review