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L10-FePt-coated PtBi2/Bi core-shell structure nanoparticles and one-step synthesis method thereof

A technology of l10-fept and core-shell structure, applied in coating, transportation and packaging, additive processing, etc., can solve the problems of poor particle size uniformity, crystal structure defects, agglomeration, etc., and achieve good controllability of particle growth, The synthesis equipment is simple and the coercive force is improved

Active Publication Date: 2021-06-04
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the film and the substrate or the core and the shell prepared by this method are grown separately, so there is an interface at the junction between the layers or between the shell and the core, and the crystal is difficult to epitaxially grow coherently, resulting in poor lattice matching and defects in the crystal structure. affect particle performance
In addition, this preparation method also has poor interface binding force, poor particle size uniformity, easy adhesion between particles, and serious agglomeration.

Method used

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  • L10-FePt-coated PtBi2/Bi core-shell structure nanoparticles and one-step synthesis method thereof
  • L10-FePt-coated PtBi2/Bi core-shell structure nanoparticles and one-step synthesis method thereof
  • L10-FePt-coated PtBi2/Bi core-shell structure nanoparticles and one-step synthesis method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] a L1 0 -FePt@PtBi 2 The one-step synthetic method of / Bi core-shell structure nanoparticle, comprises the following steps:

[0043] step 1:

[0044] Put the precursor [0.25mmol, 98.3.mg] of platinum acetylacetonate, [0.25mmol, 88.3mg] of iron acetylacetonate, [0.3mmol, 115.8mg] of bismuth acetate into a 100mL three-necked bottle, namely the Bi precursor The molar content of the body is 60% of the total molar content of the Fe and Pt precursors. Add [0.75mmol, 193.8mg] reducing agent 1,2-hexadecanediol, 10mL solvent hexadecylamine, and use a stirring bar at 70°C Stir to mix the precursor with the solvent and the reducing agent evenly to obtain a mixed liquid;

[0045] Raise the temperature of the mixture to 110°C and stir for 30 minutes to remove water, then add 0.5mL of oleic acid and 0.5mL of oleylamine, stir evenly, raise the temperature to 360°C at 6°C / min, keep it warm for 3h, and cool to room temperature with the furnace. to obtain a suspension.

[0046] Step 2...

Embodiment 2

[0053] a L1 0 -FePt@PtBi 2 The one-step synthetic method of / Bi core-shell structure nanoparticle, with embodiment 1, difference is:

[0054] Precursor Fe(acac) 2 、Pt(acac) 2 、Bi(Ac) 3 The molar ratio is 0.25:0.25:0.2, that is, the precursor adopts platinum acetylacetonate of [0.25mmol, 98.3.mg], iron acetylacetonate of [0.25mmol, 88.3mg], bismuth acetate of [0.2mmol, 77.2mg], The molar content of the Bi precursor is 40% of the total molar content of the Fe and Pt precursors. The prepared L1 0 -FePt@PtBi 2 The atomic percent of / Bi core-shell structure nanoparticle is Fe:Pt:Bi=44:33:23at%, gained L1 0 -FePt@PtBi 2 / Bi core-shell structure nanoparticles TEM morphology Image 6 As shown, the statistical average particle diameter size is 11.5±0.27nm, the core diameter is 6.3±0.64nm, and its particle size distribution histogram is shown in Figure 7 As shown, L1 0 -FePt@PtBi 2 / Bi core-shell structure nanoparticles have a coercive force of 12kOe (hysteresis loop such a...

Embodiment 3

[0056] a L1 0 -FePt@PtBi 2 The one-step synthetic method of / Bi core-shell structure nanoparticle, with embodiment 1, difference is:

[0057] Precursor Fe(acac) 2 、Pt(acac) 2 、Bi(Ac) 3 The molar ratio is 0.25:0.25:0.35, that is, the precursor adopts platinum acetylacetonate of [0.25mmol, 98.3.mg], iron acetylacetonate of [0.25mmol, 88.3mg], bismuth acetate of [0.35mmol, 135.1mg], The molar content of the Bi precursor is 70% of the total molar content of the Fe and Pt precursors.

[0058] The prepared L1 0 -FePt@PtBi 2 / Bi core-shell structure nanoparticles transmission electron microscope image see Figure 8 , its atomic percentage is Fe:Pt:Bi=40:27:33at%, the obtained L1 0 -FePt@PtBi 2 / Bi core-shell structure nanoparticles have a coercive force of 15.99kOe (hysteresis loop such as Figure 4 Shown), its X-ray diffraction pattern is shown in Figure 5 shown.

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Abstract

The invention discloses L10-FePt-coated PtBi2 / Bi core-shell structure nanoparticles and a one-step synthesis method thereof, and belongs to the field of nanoparticle magnetic control. According to the L10-FePt-coated PtBi2 / Bi core-shell structure nanoparticles, magnetic L10-FePt serves as inner cores, and non-magnetic PtBi2 and Bi coexist as outer shells; and the molar percentage of Bi meets the equation: (Fe+Pt+Bi)=23%-33%. According to the one-step synthesis method of the nanoparticles, a precursor, a reducing agent and a solvent are uniformly mixed to obtain a mixed solution, the mixed solution is heated to remove moisture, oleylamine is added, the mixed solution is heated to 300-360 DEG C at the speed of 4-6 DEG C / min, heat is preserved for 1-3 hours, and the nanoparticles are prepared after impurity removal on obtained suspension. The L10-FePt-coated PtBi2 / Bi core-shell structure nanoparticles are provided with shell-core coherent crystal structures with high coercive force, the particle size and dispersity of the nanoparticles can be controlled, and the nanoparticles can be applied to the fields of information electronics, magnetic recording, biological catalysis and the like.

Description

technical field [0001] The invention belongs to the technical field of nanoparticle magnetic control, in particular to a L1 0 -FePt@PtBi 2 / Bi core-shell nanoparticles and their one-step synthesis. Background technique [0002] In the era of digitalization and informationization, magnetic nanoparticle materials play an important role in the fields of electronic information, aerospace, biology, and catalysis. For the application of magnetic particles, the particles are required to have high magnetocrystalline anisotropy, small diameter and uniformly distributed grain size, and high hardness and corrosion resistance. In addition, in the application process, in order to avoid the magnetic coupling effect between the magnetic particles, it is hoped that there is a non-magnetic substance between the magnetic particles, so that the strong magnetic particles can be decoupled, thereby improving the comprehensive magnetic performance. [0003] L1 0 -FePt nanomaterials have very h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24B33Y30/00B33Y40/00
CPCB22F9/24B33Y30/00B33Y40/00B22F1/07B22F1/065B22F1/17
Inventor 裴文利常玲赵东王凯王强
Owner NORTHEASTERN UNIV
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