溶质表面相互作用控制激光制备铁-金核壳纳米粒子相位结构

2017/03/01   下载量： 3 次

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The influence of the pulse duration was investigated using a picosecond pulsed laser (Atlantic 532, Ekspla) with a wavelength of 1064 nm, a pulse duration of 10 ps, a pulse energy of 160 μJ, a repetition rate of 100 kHz, and a focal distance of 100 mm.

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This work highlights a strategy for the one-step synthesis of FeAu nanoparticles by the pulsed laser
ablation of alloy targets in the presence of different solvents. This method allows particle generation
without the use of additional chemicals; hence, solvent-metal interactions could be studied without
cross effects from organic surface ligands. A detailed analysis of generated particles via transmission
electron microscopy in combination with EDX elemental mapping could conclusively verify that the
nature of the used solvent governs the internal phase structure of the formed nanoparticles. In the
presence of acetone or methyl methacrylate, a gold shell covering a non-oxidized iron core was formed,
whereas in aqueous media, an Au core with an Fe3O4 shell was generated. This core-shell morphology
was the predominant species found in >90% of the examined nanoparticles. These findings indicate
that fundamental chemical interactions between the nanoparticle surface and the solvent significantly
contribute to phase segregation and elemental distribution in FeAu nanoparticles. A consecutive
analysis of resulting Fe@Au core-shell nanoparticles revealed outstanding oxidation resistance
and fair magnetic and optical properties. In particular, the combination of these features with high
stability magnetism and plasmonics may create new opportunities for this hybrid material in imaging
applications.

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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