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l10-fept@ptbi2/bi core-shell nanoparticles and its one-step synthesis

A technology of l10-fept, core-shell structure, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as poor particle size uniformity, crystal structure defects, agglomeration, etc., to achieve particle growth The effect of good controllability, simple synthesis equipment and low synthesis temperature

Active Publication Date: 2021-12-21
NORTHEASTERN UNIV LIAONING
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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@ptbi2/bi core-shell nanoparticles and its one-step synthesis
  • l10-fept@ptbi2/bi core-shell nanoparticles and its one-step synthesis
  • l10-fept@ptbi2/bi core-shell nanoparticles and its one-step synthesis

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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 Fe and Pt precursors, add [0.75mmol, 193.8mg] reducing agent 1,2-hexadecanediol, 10mL of solvent hexadecylamine, at 70 ℃ with a stirring bar 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 image Figure 6 As shown, the statistical average particle diameter size is 11.5 ± 0.27nm, the inner 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 ...

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

a L1 0 ‑FePt@PtBi 2 The invention relates to nanoparticle with / Bi core-shell structure and a one-step synthesis method thereof, belonging to the field of magnetic control of nanoparticle. The L1 0 ‑FePt@PtBi 2 / Bi core-shell nanoparticles with a magnetic core of L1 0 ‑FePt in non-magnetic PtBi case 2 Coexist with Bi; by mole percentage, Bi: (Fe+Pt+Bi) = 23% to 33%. The one-step synthesis method is as follows: mix the precursor, reducing agent, and solvent evenly to obtain a mixed solution, then raise the temperature to remove water, add oleylamine, raise the temperature to 300-360°C at 4-6°C / min, and keep it warm for 1-3 hours. The resulting suspension is prepared after removal of impurities. The L1 0 ‑FePt@PtBi 2 / Bi core-shell structure nanoparticles have high coercive force, coherent crystal structure of shell and core, and can control the particle size and dispersion of nanoparticles, and have applications in the fields of information electronics, magnetic recording and biocatalysis.

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 Patents(China)
IPC IPC(8): B22F1/02B22F9/24B82Y30/00B82Y40/00
CPCB22F9/24B33Y30/00B33Y40/00B22F1/07B22F1/065B22F1/17
Inventor 裴文利常玲赵东王凯王强
Owner NORTHEASTERN UNIV LIAONING
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