Low-Temperature Synthesis of CoO Nanoparticles via Chemically Assisted Oxidative Decarbonylation

Lagunas, Anna; Payeras, Antoni Mairata i; Jimeno, Ciril; Puntes, Víctor; Pericàs, Miquel À.

doi:10.1021/cm7018636

Cited by 16 publications

(8 citation statements)

References 81 publications

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“…17 The structural characterization of the samples was initially performed by x-ray powder diffraction (XRD) on a Philips PW 1820 diffractometer with Cu K a radiation. Low magnification transmission electron microscopy (TEM) images of the prepared materials, acquired with a JEOL 100 CX microscope at a 100 kV acceleration voltage, were used to calculate the average size of the nanoparticles and provide a view of their morphology and spatial arrangement.…”

Section: Methodsmentioning

confidence: 99%

Morphology influence on nanoscale magnetism of Co nanoparticles: Experimental and theoretical aspects of exchange bias

et al. 2011

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Co-based nanostructures ranging from core/shell to hollow nanoparticles were prepared by varying the reaction time and the chemical environment during the thermal decomposition of Co 2 (CO) 8 . Both structural characterization and kinetic model simulation illustrate that the diffusivities of cobalt and oxygen determine the growth ratio and the final morphology of the nanoparticles. Exchange coupling between Co and Co-oxide in core/shell nanoparticles induced a shift of field-cooled hysteresis loops that is proportional to the shell thickness, as verified by numerical studies. The increasing nanocomplexity, when passing from core/shell to hollow particles, also leads to the appearance of hysteresis above 300 K due to an enhancement of the surface anisotropy resulting from the additional spin-disordered surfaces.

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Section: Methodsmentioning

confidence: 99%

Morphology influence on nanoscale magnetism of Co nanoparticles: Experimental and theoretical aspects of exchange bias

et al. 2011

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“…4) and the peaks observed in the range 10-90u confirm the formation of nano phase CoO having FCC structure (JCPDS card number 431004; space group Fm3m) with no impurity detected. 42,43 The peaks at 2h values 20. reported by Hyeon et al 20 and Lagunas et al 43 In our synthesis we used CTAB as a capping agent and the selective interaction of CTAB with different crystal planes of CoO might have changed the growth rates of the different crystal planes and also their XRD peak intensities.…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 97%

“…All the above peaks are well matched with the previous reports for CoO nanomaterials. 23,[42][43][44] Other peaks at lower binding energies, 530.6 eV for O 1s (Fig. 5C) and 284.9 eV for C 1s (Fig.…”

Section: X-ray Photoelectron Spectroscopic (Xps) Studymentioning

confidence: 98%

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Formation of shape-selective magnetic cobalt oxide nanowires: environmental application in catalysis studies

et al. 2013

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A new route for the formation of shape-selective CoO nanowires has been developed using a simple microwave (MW) heating method. The reduction of Co(II) ions was done using a new reducing agent alkaline 2,7-dihydroxy naphthalene (2,7-DHN) in cetyltrimethylammonium bromide (CTAB) micellar media.The reaction mixture was irradiated using MW for a total time of 6 min. The process exclusively generates CoO nanowires of different lengths and having diameter y5 ¡ 2 nm to 15 ¡ 2 nm range just by tuning the metal-ion-to-surfactant molar ratios and changing the other reaction parameters. Magnetization measurements indicate that there is no observable coercivity for the short nanowires, but the coercivity increases as the length of the nanowires increases although the magnetic moment values at the maximum applied magnetic field of 2 T decreased with an increase in the length of the nanowires. The synthesized CoO nanowires are found to serve as an effective catalyst for the mineralization of several organic dye molecules in the presence of NaBH 4 in a short reaction time. The process assists the room temperature mineralization of the dyes and provides a cleanup measure of dye contaminated water bodies even in the presence or in the absence of light. The yield of the CoO nanowires with uniform shapes is found to be significantly high (.95%) and the nanowires are stable for more than a month under ambient conditions.The proposed synthesis method is efficient, straightforward, reproducible, and robust. Other than in catalysis, the cobalt oxide nanomaterials can also be applied for making pigments, lithium-ion battery materials, solid state sensors, or as anisotropy source for magnetic recording.

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“…CoO nanocrystals with various sizes and morphologies have been synthesized via several chemical synthetic procedures [23][24][25][26][27], including the thermal decomposition of organometallic compounds such as Co 2 (CO) 8 [28], Co(II) cupferronate [29], and Co(acac) 3 (acac = acetylacetonate) [30] or metal-oleate complexes [31]. There have been fewer reports of LiCoO 2 nanocrystals with well-defined crystal morphologies due to the synthetic difficulties involved in preparing such materials [32].…”

Section: Introductionmentioning

confidence: 99%

Shape control of CoO and LiCoO2 nanocrystals

Wang

et al. 2010

Nano Res.

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Shape control of nanocrystals has become a significant subject in materials science. In this work, we describe a convenient way to achieve morphology-controllable synthesis of CoO nanocrystals including octahedrons and spheres as well as LiCoO 2 polyhedrons and spheres. In particular, we explain the formation of CoO octahedrons exposing only high-energy (111) facets using theoretical calculations; these should also be a useful tool for directing future face-controlled preparation of other nanocrystals. More importantly, the as-obtained LiCoO 2 nanocrystals showed different electrochemical performance depending on their morphology, indicating that Li-insertion/deintercalation dynamics might be crystal face-sensitive.

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Low-Temperature Synthesis of CoO Nanoparticles via Chemically Assisted Oxidative Decarbonylation

Cited by 16 publications

References 81 publications

Morphology influence on nanoscale magnetism of Co nanoparticles: Experimental and theoretical aspects of exchange bias

Morphology influence on nanoscale magnetism of Co nanoparticles: Experimental and theoretical aspects of exchange bias

Formation of shape-selective magnetic cobalt oxide nanowires: environmental application in catalysis studies

Shape control of CoO and LiCoO2 nanocrystals

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