CN112893834B - L10-FePt @ PtBi2/Bi core-shell structure nano-particle and one-step synthesis method thereof - Google Patents

L10-FePt @ PtBi2/Bi core-shell structure nano-particle and one-step synthesis method thereof Download PDF

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CN112893834B
CN112893834B CN202110073875.4A CN202110073875A CN112893834B CN 112893834 B CN112893834 B CN 112893834B CN 202110073875 A CN202110073875 A CN 202110073875A CN 112893834 B CN112893834 B CN 112893834B
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CN112893834A (en
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裴文利
常玲
赵东
王凯
王强
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Northeastern University China
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Abstract

L10‑FePt@PtBi2A/Bi core-shell structure nano-particle and a one-step synthesis method thereof belong to the field of nano-particle magnetic control. The L10‑FePt@PtBi2The core of the/Bi core-shell structure nano-particle is magnetic L10-FePt with a non-magnetic PtBi shell2Coexisting with Bi; molar percentage, Bi: (Fe + Pt + Bi) 23-33%. The synthesis method comprises the following steps: uniformly mixing the precursor, the reducing agent and the solvent to obtain a mixed solution, heating to remove water, adding oleylamine, heating to 300-360 ℃ at a speed of 4-6 ℃/min, preserving heat for 1-3 hours, and removing impurities from the obtained suspension to obtain the catalyst. The L10‑FePt@PtBi2the/Bi core-shell structure nano particles have high coercivity and a crystal structure with a coherent shell and core, can control the particle size and the dispersity of the nano particles, and have application in the fields of information electronics, magnetic recording, biocatalysis and the like.

Description

L10-FePt @ PtBi2/Bi core-shell structure nanoparticle and one-step synthesis method thereof
Technical Field
The invention belongs to the technical field of nanoparticle magnetic control, and particularly relates to L10-FePt@PtBi2a/Bi core-shell structure nano-particle and a one-step synthesis method thereof.
Background
In the age of digital informatization, magnetic nanoparticle materials play an important role in the fields of electronic information, aerospace, biology, catalysis and the like. For magnetic particle applications, 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 among the magnetic particles, a non-magnetic substance is hopefully existed among the magnetic particles, so that the decoupling is obtained among the strong magnetic particles, and the comprehensive magnetic performance is improved.
L10The FePt nano material has very high magnetocrystalline anisotropy constant KuEqual to about 7X 106J/m3Therefore, the material has very high coercive force, very small superparamagnetic critical particle size (2.8nm) and good stability, so that the material has wide application prospects in the fields of permanent magnetic materials, magnetic recording, biomedical treatment, information electronics and the like, and is an optimal candidate material in the fields of magnetic recording media, micro-nano magnetic devices and the like, particularly in the field of information electronics. However, the FePt nanoparticles prepared directly are usually fcc structures, and L1 for high magnetocrystalline anisotropy0Structure, high temperature annealing (a)>550 ℃) to realize the conversion from the disordered structure to the ordered structure, but the high-temperature annealing easily causes the agglomeration and growth of the nano-particles and loses the excellent characteristics of the nano-particles, so the development of the method for directly synthesizing the L1 at low temperature without a heat treatment process is urgently needed0-FePt nanoparticles.
To avoid strong coupling between FePt nanoparticles, researchers have proposed encapsulating magnetic L1 with a non-magnetic medium0Core-shell structure of FePt particles, many scholars deposit Fe/Pt multilayer film on MgO, Si substrate by magnetron sputtering, thermal evaporation and other physical vapor deposition methods and use SiO2、Al2O3、B4C as a base layer, orFePt and SiO2Layer growth to form multilayer films and the like, it is desirable to disperse FePt nanoparticles in these non-magnetic media. The chemical synthesis is used for preparing a shell-core structure, for example, FePt nano particles are prepared firstly, then Si precursors are added, and Si is coated on the surfaces of the particles, so that the particles are prevented from being oxidized and magnetic particles are prevented from being separated. However, the film prepared by the method and the substrate or the inner core and the outer shell are respectively grown, so that interfaces are arranged at the interfaces between layers or between the shell and the core, crystals are difficult to epitaxially and coherently grow, the lattice matching degree is poor, the crystal structure has defects, and the particle performance is influenced. In addition, the preparation method has the problems of poor interface bonding force, poor particle size uniformity, easy adhesion among particles, serious agglomeration phenomenon and the like. How to obtain a shell-core coherent crystal structure by utilizing in-situ growth through the difference of surface energy and diffusion speed of different atoms is a bottleneck problem in the field at present.
Disclosure of Invention
In order to solve the technical problem, the invention provides L10-FePt@PtBi2a/Bi core-shell structure nano-particle and a one-step synthesis method thereof. The synthesis method is to synthesize the L1 with good dispersity, controllable size and high magnetic property in one step at low temperature0-FePt@PtBi2A method for preparing Bi core-shell structure nano particles. L1 prepared by the invention0-FePt@PtBi2the/Bi core-shell structure nano-particles are made of nonmagnetic PtBi2Magnetic L1 coexisting with Bi as a shell0The core-shell structure of FePt core has very high coercive force (15.99kOe), and the core grows out of the shell in an epitaxial way, so that the coherent crystal structure of the shell and the core is easy to obtain, the particle size and the dispersibility of the nano particles can be controlled, and the problems of strong interaction among magnetic particles and the like can be prevented. The invention can refine the particles while improving magnetism, obtains high-performance magnetic nanoparticles with shells of nonmagnetic substances, and is particularly suitable for the fields of information electronics, magnetic recording, biocatalysis and the like.
L1 of the present invention0-FePt@PtBi2The core of the/Bi core-shell structure nano-particle is magnetic L10-FePt with a non-magnetic PtBi shell2And Bi coexisting; l10-FePt@PtBi2In the/Bi core-shell structure nano-particles, the mole number of Bi accounts for 23-33% of the total mole number of FePtBi in the particles, namely Bi: (Fe + Pt + Bi) 23-33%.
Further, in mole percent, Fe: 39-44% of (Fe + Pt + Bi), Pt: (Fe + Pt + Bi) 27-33%.
L10-FePt@PtBi2The size of the/Bi core-shell structure nano particles and the size of the inner core have adjustability; l1 is controlled by adjusting the molar percentage content of Bi and synthesis parameters and combining the size of the inner core and the thickness of the outer shell0-FePt@PtBi2The macroscopic diameter of the/Bi core-shell structure nano-particles is regulated and controlled by L10-FePt@PtBi2the/Bi core-shell structure nano particles have dispersibility, so that the magnetic property of the/Bi core-shell structure nano particles is improved. Preferably, the diameter of the inner core is 3-17 nm, and the thickness of the outer shell is 2-4.5 nm.
L10-FePt@PtBi2The macro average diameter of the core-shell structure nano particles is 7-26 nm, and the coercive force of the particles is 12-15.99 kOe.
L1 of the invention0-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano particles comprises the following steps:
step 1:
the molar number of Bi accounts for 40-70% of the total molar number of Fe and Pt; molar ratio, Fe: pt ═ 9 to 13: (7-11) weighing the corresponding precursor Pt (acac)2、Fe(acac)2、Bi(Ac)3Stirring 1, 2-hexadecanediol serving as a reducing agent and long-chain alkylamine serving as a solvent at the temperature of 60-80 ℃ to uniformly mix the precursor, the solvent and the reducing agent to obtain a mixed solution; wherein, according to molar ratio, the reducing agent: fe + Pt ═ 1.5: 1, adding the solvent in an amount to ensure that the molar concentration of Fe and Pt in the solution reaches 0.05 mol/L; the long-chain alkylamine is preferably hexadecylamine or octadecylamine;
heating the mixed solution to 105-125 ℃, stirring for 30-40 min, removing water, adding oleylamine, wherein the adding amount of the oleylamine is 5% -10% of the volume of the solvent, uniformly stirring, heating to 300-360 ℃ at a speed of 4-6 ℃/min, preserving heat for 1-3 h, and cooling to room temperature along with a furnace to obtain a suspension;
step 2:
adding ethanol into the suspension to precipitate, performing solid-liquid separation, adding n-hexane into the precipitate to disperse, adding ethanol to precipitate, repeating for several times, cleaning the precipitate to remove impurities to obtain L10-FePt@PtBi2the/Bi core-shell structure nano-particles.
In the step 1, while adding oleylamine, surfactant oleic acid can be added, the addition amount of the surfactant oleic acid is 5-10% of the volume of the solvent, and after the surfactant oleic acid is added, L1 is formed0-FePt@PtBi2the/Bi core-shell structure nano particles are spherical.
In the step 2, the solid-liquid separation is preferably performed by centrifugal separation.
L1 of the invention0-FePt@PtBi2Compared with the prior art, the/Bi core-shell structure nano-particles and the one-step synthesis method thereof have the beneficial effects that:
1. l1 of the present invention0-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano particles has the advantages of simple synthesis equipment, high repeatability of the synthesis process, good controllability of particle growth and easiness in industrialization.
2. L1 of the present invention0-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano particles has low synthesis temperature which is only 300-360 ℃.
3. L1 of the present invention0-FePt@PtBi2the/Bi core-shell structure nano-particles control the size of the particles and the size of the inner core by controlling the content of Bi, and control the size of the particles and the dispersibility of the particles.
4. L1 of the present invention0-FePt@PtBi2the/Bi core-shell structure nano-particles realize the regulation and control of the magnetic performance of the core-shell nano-particles by controlling the content of Bi, so that the coercive force of the nano-particles is from 12kOe to 15.99 kOe.
5. L1 of the present invention0-FePt@PtBi2the/Bi core-shell structure nano particles can realize the improvement of coercive force and can also ensure good particlesSo that the average particle size of the particles under the coercive force of 15.99kOe is still kept below 20 nm.
6. The invention utilizes the difference of atomic diffusion speed and surface energy to obtain a core-shell structure and leads the core to form L10-a FePt phase. Because Bi has larger atomic radius, defects and vacancies can be formed in the diffusion process, and the arrangement of FePt atoms is promoted to be L10-FePt. And Bi has a low surface energy, so that Bi is easily diffused to the outside of the particle and deposited on the surface of the particle, and further PtBi2Has low formation energy, Bi is easy to form a second phase with Pt, so that Bi or PtBi is easy to form on the shell2And (4) enriching.
7. The surface of the FePt magnetic particle obtained by the invention is composed of a layer of nonmagnetic Bi or PtBi2The coating can effectively shield the coupling effect between the particles, improve the comprehensive magnetic property of magnetism, and is suitable for preparing the particles into a block magnetic material by a powder metallurgy process.
Drawings
FIG. 1 shows L1 synthesized in example 1 of the present invention0-FePt@PtBi2Transmission electron microscopy (TEM image) of/Bi core-shell structured nanoparticles; FIG. 1 shows a kernel; 2 is a shell; the core is magnetic L10-FePt with a non-magnetic PtBi shell2Coexisting with Bi;
FIG. 2 shows L1 synthesized in example 1 of the present invention0-FePt@PtBi2The grain size distribution histogram of the/Bi core-shell structure nano particles;
FIG. 3 shows L1 synthesized in example 1 of the present invention0-FePt@PtBi2a/Bi core-shell structure nano particle high-resolution TEM image;
FIG. 4 shows the synthesis of L1 at different Bi contents according to the invention0-FePt@PtBi2a/Bi core-shell structure nanoparticle magnetic hysteresis diagram;
FIG. 5 shows the results of L1 at different Bi contents synthesized according to the present invention0-FePt@PtBi2X-ray diffraction pattern of/Bi core-shell structure nano particles;
FIG. 6 shows L1 synthesized in example 2 of the present invention0-FePt@PtBi2A transmission electron microscope picture of the/Bi core-shell structure nano-particles;
FIG. 7 shows L1 synthesized in example 2 of the present invention0-FePt@PtBi2The grain size distribution histogram of the/Bi core-shell structure nano particles;
FIG. 8 shows L1 synthesized in example 3 of the present invention0-FePt@PtBi2A transmission electron microscope picture of the/Bi core-shell structure nano-particles;
FIG. 9 shows L1 synthesized in comparative example 1 of the present invention0-FePt@PtBi2A transmission electron microscope picture of the/Bi core-shell structure nano-particles;
FIG. 10 is L1 synthesized in comparative example 2 of the present invention0-FePt@PtBi2A transmission electron microscope picture of the/Bi core-shell structure nano-particles;
FIG. 11 is L1 synthesized in comparative example 3 of the present invention0-FePt@PtBi2A transmission electron microscope picture of the/Bi core-shell structure nano-particles;
FIG. 12 is L1 synthesized in comparative example 3 of the present invention0-FePt@PtBi2Magnetic hysteresis of the/Bi core-shell structure nano particles;
FIG. 13 is L1 synthesized in comparative example 4 of the present invention0-FePt@PtBi2A transmission electron microscope picture of the/Bi core-shell structure nano-particles.
Detailed Description
The present invention will be described in further detail with reference to examples.
The test methods described in the following examples, unless otherwise specified, are all conventional; the reagents used, unless otherwise specified, are commercially available.
Example 1
L10-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano particles comprises the following steps:
step 1:
putting a precursor (0.25 mmol, 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 molar content of a Bi precursor is 60 percent of the total molar content of Fe and Pt precursors, adding [0.75mmol, 193.8mg ] of reducing agent 1, 2-hexadecanediol and 10mL of solvent hexadecylamine, stirring by a stirrer at 70 ℃ to uniformly mix the precursor, the solvent and the reducing agent to obtain a mixed solution;
heating the mixed solution to 110 ℃, stirring for 30min, removing water, then adding 0.5mL of oleic acid and 0.5mL of oleylamine, stirring uniformly, heating to 360 ℃ at the speed of 6 ℃/min, preserving heat for 3h, and cooling to room temperature along with the furnace to obtain a suspension.
Step 2:
adding ethanol into the suspension to precipitate, centrifuging, adding n-hexane into the precipitate for dispersion, adding ethanol to precipitate, centrifuging, repeating for 3 times, cleaning the precipitate to remove impurities to obtain L10-FePt@PtBi2the/Bi core-shell structure nano-particles.
Obtained L10-FePt@PtBi2The atomic percentage (at%) of the/Bi core-shell structure nanoparticles is Fe: Pt: Bi: 39:29:32, the obtained core-shell structure nanoparticles have good dispersibility, and a TEM morphology graph is shown in FIG. 1, and it can be seen that all the particles are core-shell structures and have good dispersibility. The size of the statistical average particle diameter is 17.0 +/-0.31 nm, and the diameter of the inner core is 10.1 +/-0.56 nm. For L10-FePt@PtBi2The particle size distribution histogram of the/Bi core-shell structure nanoparticles obtained by particle size statistics is shown in FIG. 2.
Measurement of the interplanar spacing of the core and shell in a high resolution TEM image (FIG. 3) of a single particle determined the core to be magnetic L10-FePt with a non-magnetic PtBi shell2And Bi coexist. The synthesized nanoparticles have a shell-core coherent crystal structure, and can be judged by a high-resolution TEM image shown in FIG. 3, and the synthesized nanoparticles can be obtained by analyzing the co-growth of the core and the shell shown in FIG. 3, and the core and the shell are well connected, so that the nanoparticles are proved to have the shell-core coherent crystal structure.
L10-FePt@PtBi2The coercive force of the/Bi core-shell structure nano-particles reaches 13.99kOe, and a magnetic hysteresis loop is shown in figure 4.
Prepared L10-FePt@PtBi2The phase of the/Bi core-shell structure nano-particles is L10-FePt、PtBi2Bi having an X-ray diffraction pattern as shown in FIG. 5, wherein L1 represents the core0-FePt with a shell of PtBi2And Bi coexist.
Example 2
L10-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano particles is the same as that of the example 1, except that:
precursor Fe (acac)2、Pt(acac)2、Bi(Ac)3The molar ratio of (1) to (2) is 0.25:0.25:0.2, namely [0.25mmol, 98.3.mg ] of the precursor]Of platinum acetylacetonate, [0.25mmol, 88.3mg]0.2mmol of [ 77.2mg ] of iron acetylacetonate]The molar content of the Bi precursor is 40 percent of the total molar content of the Fe precursor and the Pt precursor. Obtained L10-FePt@PtBi2The atomic percentage of the/Bi core-shell structure nano particles is Fe, Pt, Bi 44, 33 and 23at percent, and the obtained L10-FePt@PtBi2The TEM morphology of the/Bi core-shell structure nano-particles is shown in FIG. 6, the statistical average particle diameter size is 11.5 +/-0.27 nm, the inner core diameter is 6.3 +/-0.64 nm, the particle size distribution histogram is shown in FIG. 7, and L10-FePt@PtBi2The coercive force of the/Bi core-shell structure nano-particles reaches 12kOe (a magnetic hysteresis loop is shown in figure 4). Compared with the particles in the embodiment 1, the particle size is reduced, the core size is reduced, the coercive force is reduced, and the X-ray diffraction pattern is shown in FIG. 5.
Example 3
L10-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano particles is the same as that of the example 1, except that:
precursor Fe (acac)2、Pt(acac)2、Bi(Ac)3The molar ratio of (1) to (2) is 0.25:0.25:0.35, namely [0.25mmol, 98.3.mg ] of the precursor]Of platinum acetylacetonate, [0.25mmol, 88.3mg]0.35mmol, 135.1mg of ferric acetylacetonate]The molar content of the Bi precursor is 70 percent of the total molar content of Fe and Pt precursors.
Obtained L10-FePt@PtBi2The TEM image of the/Bi core-shell structure nanoparticles is shown in FIG. 8, and the atomic percentages are Fe: Pt: Bi 40:27:33 at%, and the obtained L10-FePt@PtBi2The coercive force of the/Bi core-shell structure nano-particles reaches 15.99kOe (magnetic hysteresis loop)As shown in fig. 4), and its X-ray diffraction pattern is shown in fig. 5.
Example 4
L10-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano particles comprises the following steps:
step 1:
mixing the precursor Fe (acac)2、Pt(acac)2、Bi(Ac)3The molar ratio of (1) to (2) is 0.25:0.25:0.2, namely [0.25mmol, 98.3.mg ] of the precursor]Of platinum acetylacetonate, [0.25mmol, 88.3mg]0.2mmol of [ 77.2mg ] of iron acetylacetonate]The molar content of the Bi precursor is 40 percent of the total molar content of the Fe precursor and the Pt precursor. Add [0.75mmol, 193.8 mg)]1, 2-hexadecanediol serving as a reducing agent and hexadecylamine serving as a solvent, which is 10mL, are stirred by a stirrer at the temperature of 60 ℃ to uniformly mix the precursor, the solvent and the reducing agent to obtain a mixed solution;
heating the mixed solution to 105 ℃, stirring for 40min, removing water, then adding 1mL of oleylamine, stirring uniformly, heating to 300 ℃ at the speed of 4 ℃/min, preserving heat for 2h, and cooling to room temperature along with the furnace to obtain a suspension.
Step 2:
adding ethanol into the suspension to precipitate, centrifuging, adding n-hexane into the precipitate for dispersion, adding ethanol to precipitate, centrifuging, repeating for 3 times, cleaning the precipitate to remove impurities to obtain L10-FePt@PtBi2the/Bi core-shell structure nano-particles.
Obtained L10-FePt@PtBi2the/Bi core-shell structure nano particles are irregular in shape.
Example 5
L10-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano particles comprises the following steps:
step 1:
putting a precursor (0.25 mmol, 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 molar content of a Bi precursor is 60 percent of the total molar content of Fe and Pt precursors, adding [0.75mmol, 193.8mg ] of reducing agent 1, 2-hexadecanediol and 10mL of solvent octadecylamine, stirring by a stirrer at 80 ℃, and uniformly mixing the precursor, the solvent and the reducing agent to obtain a mixed solution;
heating the mixed solution to 125 ℃, stirring for 30min, removing water, then adding 1mL of oleic acid and 1mL of oleylamine, stirring uniformly, heating to 360 ℃ at the speed of 4 ℃/min, preserving heat for 1h, and cooling to room temperature along with the furnace to obtain a suspension.
Step 2:
adding ethanol into the suspension to precipitate, centrifuging, adding n-hexane into the precipitate for dispersion, adding ethanol to precipitate, centrifuging, repeating for 3 times, cleaning the precipitate to remove impurities to obtain L10-FePt@PtBi2the/Bi core-shell structure nano-particles.
Comparative example 1
L10-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano particles is the same as that of the example 1, except that:
precursor Fe (acac)2、Pt(acac)2、Bi(Ac)3The molar ratio of (1) to (2) is 0.25:0.25:0.1, namely [0.25mmol, 98.3.mg ] of the precursor]Of platinum acetylacetonate, [0.25mmol, 88.3mg]0.1mmol, 38.6mg of ferric acetylacetonate]And (3) bismuth acetate. The atomic percent of the prepared particles is Fe, Pt and Bi is 48, 39 and 13 at%, the TEM morphology graph is shown in FIG. 9, the statistics of the prepared average particle size is 13.6 +/-0.24 nm, compared with the particles in examples 1 and 2, the particles in the example have poor dispersibility because no obvious core-shell structure is formed, and the coercive force of the obtained nanoparticles is obviously reduced. The coercivity of the particles was 1.26 kOe.
Comparative example 2
L10-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano-particles is the same as that in the example 1, except that the heating rate is 2 ℃/min, the molar ratio of the precursors Fe, Pt and Bi is 0.25:0.25:0.25, namely the precursor is [0.25mmol, 98.3.mg ] of the precursor]Of platinum acetylacetonate, [0.25mmol, 88.3mg]0.1mmol, 96.5mg of ferric acetylacetonate]And (3) bismuth acetate. The atomic percent of the prepared particles is Fe, Pt, Bi, 42, 32, 26 at%, the TEM morphology of the obtained core-shell structure nano particles is shown in FIG. 10, and the particles areThe particle dispersibility is reduced, the core-shell structure is not obvious compared with the embodiments 1 and 2, and the coercive force of the particles reaches 5.7 kOe.
Comparative example 3
L10-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano-particles is the same as the example 1, except that the reaction temperature is 260 ℃. The morphology is shown in a transmission electron microscope as figure 11, and the magnetic performance is shown in a hysteresis loop as figure 12. The obtained nano particles have low content of core-shell structures, irregular particle shapes and large size difference, but have partial core-shell structures. The coercive force of the obtained nano-particles reaches 1.99 kOe.
Comparative example 4
L10The one-step synthesis method of the FePt/Bi nanoparticles is the same as that of example 1, except that the FePt/Bi nanoparticles are directly placed at 360 ℃ to react for 10min, and the morphology of the obtained nanoparticles is shown in FIG. 13. Most of the obtained particles are in a core-shell structure, but the particles are communicated with each other and have larger particle size difference. The coercive force of the obtained nano-particles reaches 4.04 kOe.

Claims (6)

1. A kind ofL10-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano particles is characterized by comprising the following steps:
step 1:
the molar number of Bi accounts for 40-70% of the total molar number of Fe and Pt; molar ratio, Fe: pt = (9-13): (7-11) weighing the corresponding precursor Pt (acac)2、Fe(acac)2、Bi(Ac)3Stirring 1, 2-hexadecanediol serving as a reducing agent and long-chain alkylamine serving as a solvent at the temperature of 60-80 ℃ to uniformly mix the precursor, the solvent and the reducing agent to obtain a mixed solution;
wherein, according to molar ratio, the reducing agent: fe + Pt = 1.5: 1, adding the solvent in an amount to ensure that the molar concentration of Fe and Pt in the solution reaches 0.05 mol/L;
heating the mixed solution to 105-125 ℃, stirring for 30-40 min, removing water, adding oleylamine, wherein the adding amount of the oleylamine is 5% -10% of the volume of the solvent, uniformly stirring, heating to 300-360 ℃ at a speed of 4-6 ℃/min, preserving heat for 1-3 h, and cooling to room temperature along with a furnace to obtain a suspension;
step 2:
adding ethanol into the suspension to precipitate, separating solid and liquid, adding n-hexane into the precipitate for dispersion, adding ethanol for precipitation, repeating for several times, cleaning the precipitate, and removing impurities to obtain the final productL10-FePt@PtBi2a/Bi core-shell structured nanoparticle;
saidL10-FePt@PtBi2The core of the/Bi core-shell structure nano particle is magneticL10-FePt with a non-magnetic PtBi shell2Coexisting with Bi;L10-FePt@PtBi2in the/Bi core-shell structure nano particles, the molar percentage is Bi: (Fe + Pt + Bi) =23% -33%.
2. The method of claim 1L10-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano-particles is characterized in that,L10-FePt@PtBi2the/Bi core-shell structure nano particles comprise the following components in percentage by mol: (Fe + Pt + Bi) =39% -44%, Pt: (Fe + Pt + Bi) =27% -33%.
3. The method of claim 1L10-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano particles is characterized in thatL10-FePt@PtBi2The size of the/Bi core-shell structure nano particles and the size of the inner core have adjustability; by adjusting the molar percentage content of Bi and the synthesis parameters,L10-FePt@PtBi2the diameter of the core of the/Bi core-shell structure nano particle is 3-17 nm, and the thickness of the shell is 2-4.5 nm.
4. The method of claim 1L10-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano particles is characterized in thatL10-FePt@PtBi2The macro average diameter of the core-shell structure nano particles is 7-26 nm, and the coercive force of the particles is 12-15.99 kOe.
5. The method of claim 1L10-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano-particles is characterized in that the long-chain alkylamine is hexadecylamine or octadecylamine.
6. The method of claim 1L10-FePt@PtBi2The one-step synthesis method of the/Bi core-shell structure nano-particles is characterized in that in the step 1, surfactant oleic acid is added while oleylamine is added, the addition amount of the surfactant oleic acid is 5% -10% of the volume of a solvent, and the surfactant oleic acid is added to form the nano-particlesL10-FePt@PtBi2the/Bi core-shell structure nano particles are spherical.
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