Formation of extended ordered monolayers of FePt nanoparticles

Acet, Mehmet; Mayer, Christian; Muth, Oliver; Terheiden, Annegret; Dyker, Gerald

doi:10.1016/j.jcrysgro.2005.08.035

Cited by 15 publications

(12 citation statements)

References 8 publications

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“…[70][71][72][73][74][75][76] The assembly technique has been extended to produce composite assemblies of polyethylenimine (PEI)-FePt, [52,77] phospholipid-FePt, [78] and oleic acid/oleylamine-FePt. [79] Characterizations of the layered PEI-FePt structure via X-ray reflectivity and atomic force microscopy indicate that the PEI-mediated FePt assemblies have wellcontrolled thicknesses. [52] The FePt nanoparticles have also been assembled on a Si/SiO 2 substrate using (3-(2-aminoethylamino)propyl)trimethoxysilane as a coupling layer.…”

Section: Polymer-mediated Self-assemblymentioning

confidence: 99%

Recent Advances in Chemical Synthesis, Self‐Assembly, and Applications of FePt Nanoparticles

2006

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This paper reviews recent advances in chemical synthesis, self‐assembly, and potential applications of monodisperse binary FePt nanoparticles. After a brief introduction to nanomagnetism and conventional processes of fabricating FePt nanoparticles, the paper focuses on recent developments in solution‐phase syntheses of monodisperse FePt nanoparticles and their self‐assembly into nanoparticle superlattices. The paper further outlines the surface, structural, and magnetic properties of the FePt nanoparticles and gives examples of three potential applications in data storage, permanent magnetic nanocomposites, and biomedicine.

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Section: Polymer-mediated Self-assemblymentioning

confidence: 99%

Recent Advances in Chemical Synthesis, Self‐Assembly, and Applications of FePt Nanoparticles

2006

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“…In addition, FePt NPs have a higher chemical stability than other hard magnetic materials [ 1 ]. Their well-defined boundaries and small size are very suitable to reach ultra-high storage densities with reduced noise [ 2 , 15 ] in the order of terabit/inch 2 . For the use of FePt NPs in magnetic applications, it is necessary to have a well-controlled assembly process and to cover a sizeable area with high packing density [ 1 , 2 , 10 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…Their well-defined boundaries and small size are very suitable to reach ultra-high storage densities with reduced noise [ 2 , 15 ] in the order of terabit/inch 2 . For the use of FePt NPs in magnetic applications, it is necessary to have a well-controlled assembly process and to cover a sizeable area with high packing density [ 1 , 2 , 10 , 13 ]. One method used to attach the particles on the surface is by self-assembly with the help of a coupling layer such as poly (ethyleneimine) (PEI) [ 1 ] or an aminosilane [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Monolayer-directed Assembly and Magnetic Properties of FePt Nanoparticles on Patterned Aluminum Oxide

Yildirim

Tang

Kinge

et al. 2010

IJMS

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FePt nanoparticles (NPs) were assembled on aluminum oxide substrates, and their ferromagnetic properties were studied before and after thermal annealing. For the first time, phosph(on)ates were used as an adsorbate to form self-assembled monolayers (SAMs) on alumina to direct the assembly of NPs onto the surface. The Al2O3 substrates were functionalized with aminobutylphosphonic acid (ABP) or phosphonoundecanoic acid (PNDA) SAMs or with poly(ethyleneimine) (PEI) as a reference. FePt NPs assembled on all of these monolayers, but much less on unmodified Al2O3, which shows that ligand exchange at the NPs is the most likely mechanism of attachment. Proper modification of the Al2O3 surface and controlling the immersion time of the modified Al2O3 substrates into the FePt NP solution resulted in FePt NPs assembly with controlled NP density. Alumina substrates were patterned by microcontact printing using aminobutylphosphonic acid as the ink, allowing local NP assembly. Thermal annealing under reducing conditions (96%N2/4%H2) led to a phase change of the FePt NPs from the disordered FCC phase to the ordered FCT phase. This resulted in ferromagnetic behavior at room temperature. Such a process can potentially be applied in the fabrication of spintronic devices.

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“…SC method is a nonequilibrium method and the controllable aspects of crystallization of colloidal solution have not yet been found [13][14][15][16]. Islands formation and surface holes are typical problems of SC method [13,15].…”

Section: Introductionmentioning

confidence: 99%

Size control of L12-FePt3 nanocrystals by spin-coating method

2016

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Annealing is one of the stages of FePt nanoparticles preparation, during which the transition to a compositionally ordered phase occurs. In order to size and shape control of the nanoparticles in the mentioned stage, it is needed that they be distributed on a suitable surface. In the present work, the spin-coating method is suggested for preparing monolayer from L1 2 -FePt 3 nanoparticles colloidal solution on SiO 2 /Si substrates. FePt 3 nanoparticles were gradually deposited as droplets on the center of a 500 rpm rotating substrate. This step was performed in hexane vapor atmosphere without any stopping time. The analyses revealed that a uniform surface distribution was formed so that, after annealing at 600°C for 1 h the 6.1 nm L1 2 -FePt 3 nanoparticles were spherical in shape with standard deviation of 1.5 nm.

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Formation of extended ordered monolayers of FePt nanoparticles

Cited by 15 publications

References 8 publications

Recent Advances in Chemical Synthesis, Self‐Assembly, and Applications of FePt Nanoparticles

Recent Advances in Chemical Synthesis, Self‐Assembly, and Applications of FePt Nanoparticles

Monolayer-directed Assembly and Magnetic Properties of FePt Nanoparticles on Patterned Aluminum Oxide

Size control of L12-FePt3 nanocrystals by spin-coating method

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