4.6 Article

Ferromagnetic Ni Nanoparticle with Controlled Anisotropy: From Polyhedral to Planar Tetrapods

期刊

JOURNAL OF PHYSICAL CHEMISTRY C
卷 -, 期 -, 页码 -

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.2c06177

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资金

  1. Foundation de la Maison de la Chimie
  2. French national project POMADE [ANR 19-CE09-0021-01]
  3. EUR grant NanoX [ANR-17-EURE-0009]
  4. SATT TTT (Soft Magneto)
  5. Occitanie region (SoftRF).
  6. European Union Horizon 2020 research and innovation programme [823717-ESTEEM3]
  7. French National Research Agency under the Investissement d'Avenir program [ANR-10-EQPX-38-01]
  8. French national project IODA [ANR-17-CE24-0047]
  9. Agence Nationale de la Recherche (ANR) [ANR-17-CE24-0047] Funding Source: Agence Nationale de la Recherche (ANR)

向作者/读者索取更多资源

This study reports a simple method to synthesize magnetic nanoparticles with anisotropic shapes, and control their size by tuning the reaction conditions. The experimental results combined with computational simulations demonstrate the significance of shape anisotropy in magnetic nanoparticles.
Liquid phase syntheses mainly yield nanoparticles with compact shapes, such as spheres or cubes. However, controlling not only the size but also the shape of magnetic nanoparticles would enable a fine-tuning of their intrinsic properties, due to the shape anisotropy induced by long-range dipolar interactions. We report here a fairly simple approach based on the reduction of an amidinate complex in the presence of a mixture of long-chains acid and amine to yield ferromagnetic Ni nanoparticles. The formation of stable Ni complexes could be promoted in situ by increasing the acid concentration, thus allowing tuning of the final particle size. While amine could be used as a soft reducing agent, dihydrogen was essential to promote anisotropic shapes. Electron holography combined with micromagnetic simulations showed that the resulting shape anisotropy could impose complex magnetic configurations within planar tetrapods. Regarding the heating efficiency, which directly scales with the magnetic hysteresis loop area, maxima of 100W.g(-1) were found for nanoplates and nanorods, opening promising perspectives for magnetically induced catalysis.

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