Cobalt‐Substituted Magnetite Nanoparticles and Their Assembly into Ferrimagnetic Nanoparticle Arrays

Yu, Yongsheng; Mendoza‐Garcia, Adriana; Ning, Bo; Sun, Shouheng

doi:10.1002/adma.201300595

Cited by 99 publications

(96 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When polyhedral NPs react with TOP( Supporting Information, Figure S3 A-E), some rods are formed after only 1.5 ho f reaction. Also,i ns ome NPs,i ti sp ossible to see how "rodlike" protuberances emerge from their surface,indicating the growth of M-P from the M-O surface.I mages after 3, 6, and 12 hofreaction show the progressive formation/elongation of the rods as ac onsequence of the phosphidation of all of the oxide NPs.T he exposed planes on these single-crystal structures (generally (311) or (111)) [8] are readily available for Pdiffusion, and therefore growth along asingle direction is observed. On the other hand, when the nanocubes are used as seeds (Supporting Information, Figure S3 F-J), it can be seen that after 1.5 ho fr eaction the cubes initially adopt concave shapes that later grow into the sea-urchin structures.…”

Section: Methodsmentioning

confidence: 99%

Controlled Anisotropic Growth of Co‐Fe‐P from Co‐Fe‐O Nanoparticles

et al. 2015

Self Cite

View full text Add to dashboard Cite

A facile approach to bimetallic phosphides, Co-Fe-P, by a high-temperature (300 °C) reaction between Co-Fe-O nanoparticles and trioctylphosphine is presented. The growth of Co-Fe-P from the Co-Fe-O is anisotropic. As a result, Co-Fe-P nanorods (from the polyhedral Co-Fe-O nanoparticles) and sea-urchin-like Co-Fe-P (from the cubic Co-Fe-O nanoparticles) are synthesized with both the nanorod and the sea-urchin-arm dimensions controlled by Co/Fe ratios. The Co-Fe-P structure, especially the sea-urchin-like (Co(0.54)Fe(0.46))2P, shows enhanced catalysis for the oxygen evolution reaction in KOH with its catalytic efficiency surpassing the commercial Ir catalyst. Our synthesis is simple and may be readily extended to the preparation of other multimetallic phosphides for important catalysis and energy storage applications.

show abstract

Section: Methodsmentioning

confidence: 99%

Controlled Anisotropic Growth of Co‐Fe‐P from Co‐Fe‐O Nanoparticles

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…59,60 Similar theoretical and experimental investigations on bulk Co x Fe 3−x O 4 also reveal that the coercivity of the cobalt ferrite increases with x from 0 to 0.7 but decreases when x is beyond 0.7, which is validated in the Co x Fe 3−x O 4 NPs. 61,62 3. SYNTHESIS OF MAGNETIC NANOPARTICLES As the properties of magnetic NPs are strongly dependent on their dimensions, compositions, and structures, extensive efforts have been made to synthesize these NPs with fine controls over the size, shape, composition, and structure.…”

Section: Composition Effectmentioning

confidence: 99%

Organic Phase Syntheses of Magnetic Nanoparticles and Their Applications

et al. 2016

Self Cite

View full text Add to dashboard Cite

In the past two decades, the synthetic development of magnetic nanoparticles (NPs) has been intensively explored for both fundamental scientific research and technological applications. Different from the bulk magnet, magnetic NPs exhibit unique magnetism, which enables the tuning of their magnetism by systematic nanoscale engineering. In this review, we first briefly discuss the fundamental features of magnetic NPs. We then summarize the synthesis of various magnetic NPs, including magnetic metal, metallic alloy, metal oxide, and multifunctional NPs. We focus on the organic phase syntheses of magnetic NPs with precise control over their sizes, shapes, compositions, and structures. Finally we discuss the applications of various magnetic NPs in sensitive diagnostics and therapeutics, high-density magnetic data recording and energy storage, as well as in highly efficient catalysis.

show abstract

“…Therefore, continuing efforts have been devoted to the synthesis of new MNPs with improved magnetic properties [7][8][9][10][11] . Interestingly, Doaga et al 9 have reported that relative to Fe3O4 nanoparticles, manganese-doped iron oxide nanoparticles of MnxFe1-xFe2O4 (0 ≤ x ≤ 1) show the enhanced saturation magnetization (Ms) and hence the enhanced specific absorption rate (SAR), which is a measure of heating efficiency.…”

Section: Introductionmentioning

confidence: 99%

Enhanced magnetic anisotropy and heating efficiency in multi-functional manganese ferrite/graphene oxide nanostructures

Giang

Tam

et al. 2016

Nanotechnology

View full text Add to dashboard Cite

A promising nanocomposite material composed of MnFe2O4 (MFO) nanoparticles of ~17 nm diameter deposited onto graphene oxide (GO) nanosheets was successfully synthesized using a modified co-precipitation method. X-ray diffraction (XRD), transmission electron microscopy (TEM), and selected area electron diffraction (SAED) confirmed the quality of the synthesized samples. Fourier Transform Infrared (FTIR) measurements and analysis evidenced that the MFO nanoparticles were attached to the GO surface. Magnetic measurements and analysis using the modified Langevin model evidenced the superparamagnetic characteristic of both the bare MFO nanoparticles and the MFO-GO nanocomposite at room temperature, and an appreciable increase of the effective anisotropy for the MFO-GO sample. Magnetic hyperthermia experiments performed by both calorimetric and AC magnetometry methods indicated that relative to the bare MFO nanoparticles, the heating efficiency of the MFO-GO nanocomposite was similar at low ac fields (0-300 Oe) but became progressively larger with increasing ac fields (> 300 Oe). This has been related to the higher effective anisotropy of the MFO-GO nanocomposite. In comparison with the bare MFO nanoparticles, a smaller reduction in the heating efficiency was observed in the MFO-GO composites when MFO-GO were embedded in agar or when their concentration was increased, indicating that the GO helped minimize the physical rotation and aggregation of the MFO nanoparticles. These findings can be of practical importance in exploiting this type of nanocomposite for advanced hyperthermia. Magnetoimpedance-based biodetection studies also indicated that the MFO-GO nanocomposite could be used as a promising magnetic biomarker in biosensing applications.

show abstract

Cobalt‐Substituted Magnetite Nanoparticles and Their Assembly into Ferrimagnetic Nanoparticle Arrays

Cited by 99 publications

References 31 publications

Controlled Anisotropic Growth of Co‐Fe‐P from Co‐Fe‐O Nanoparticles

Controlled Anisotropic Growth of Co‐Fe‐P from Co‐Fe‐O Nanoparticles

Organic Phase Syntheses of Magnetic Nanoparticles and Their Applications

Enhanced magnetic anisotropy and heating efficiency in multi-functional manganese ferrite/graphene oxide nanostructures

Contact Info

Product

Resources

About