2020
DOI: 10.1021/acsanm.0c00092
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Ligand-Stabilized CoO and NiO Nanoparticles for Spintronic Devices with Antiferromagnetic Insulators

Abstract: Cobalt oxide (CoO) and nickel oxide (NiO) nanoparticles, coordinated by oleylamine, oleic acid, and trioctylphosphine oxide, were prepared as antiferromagnetic materials in 1-octanol or 1dodecanol by rapid synthesis under microwave irradiation. Structural analysis of the finally obtained oxide nanoparticles was performed by means of X-ray diffraction, high-resolution transmission electron microscopy, and extended X-ray absorption fine structure measurements, which suggested that the higher temperature in 1-dod… Show more

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Cited by 23 publications
(15 citation statements)
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“…The double decay was observed above 488 K, which was due to (i) the removal of weakly physisorbed water and solvent molecules (below 488 K) and (ii) decomposition of the chemisorbed organic ligands (in the range 488–673 K). The coordination ability of TOPO to the surface of nanoparticles was much more reliable than that of OAm (or OA), ,, which resulted in the occurrence of double decay. Additionally, in the case of NiFe 2 O 4 nanoparticles, the weight tended to increase below 523 K, probably due to the oxidation of unreacted Fe 3+ and Ni 2+ precursors.…”
Section: Results and Discussionmentioning
confidence: 99%
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“…The double decay was observed above 488 K, which was due to (i) the removal of weakly physisorbed water and solvent molecules (below 488 K) and (ii) decomposition of the chemisorbed organic ligands (in the range 488–673 K). The coordination ability of TOPO to the surface of nanoparticles was much more reliable than that of OAm (or OA), ,, which resulted in the occurrence of double decay. Additionally, in the case of NiFe 2 O 4 nanoparticles, the weight tended to increase below 523 K, probably due to the oxidation of unreacted Fe 3+ and Ni 2+ precursors.…”
Section: Results and Discussionmentioning
confidence: 99%
“…In a standard synthetic procedure for Fe 3 O 4 nanoparticles, as described in our previous paper, 1 mmol of Fe­(acac) 3 was dissolved in 10 mmol of OAm in a 200 mL two-neck round-bottom flask. An oil bath was used to heat the initial red solution under a nitrogen atmosphere at 393 K for 30 min.…”
Section: Methodsmentioning
confidence: 99%
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“…NiO has been used in various applications, including catalysis, spintronic devices, and supercapacitors, because of its good thermal stability and environmental friendliness. [17][18][19][20][21][22] Bulk NiO is categorized as a Mott-Hubbard insulator with a wide bandgap of 4.3 eV, which is suitable for collecting highenergy photons (UV-light). 23 A few studies are reported on NiO nanostructures, which show photocatalytic dye degradation properties under UV light.…”
Section: Introductionmentioning
confidence: 99%
“…[ 1–7 ] Moreover, electrically insulating NiO thin films are widely used in spintronic devices for the enhancement of spin currents. [ 8,9 ] The AFM and spin behavior of NiO nanostructures depends on the parameters like particle size, morphology, structure, Ni vacancy concentration, and surface defects. [ 10 ] Variation in these parameters leads to anomalous optical, and magnetic behavior, which has been reported by many authors using experimental techniques like Raman spectroscopy and neutron scattering experiments.…”
Section: Introductionmentioning
confidence: 99%