Synthesis of naked plasmonic/magnetic Au/Fe3O4 nanostructures by plasmon-driven anti-replacement reaction

Shusheng Pan; Zhiyu Liu; Wei Lu

doi:10.1088/1361-6528/aaf17c

Synthesis of naked plasmonic/magnetic Au/Fe₃O₄ nanostructures by plasmon-driven anti-replacement reaction

Nanotechnology. 2019 Feb 8;30(6):065605. doi: 10.1088/1361-6528/aaf17c.

Authors

Shusheng Pan¹, Zhiyu Liu, Wei Lu

Affiliation

¹ Department of Physics, School of Physics and Electronic Engineering, Guangzhou University, Guangzhou 510006, People's Republic of China.

PMID: 30523894
DOI: 10.1088/1361-6528/aaf17c

Abstract

In this study, naked Au(core)/Fe₃O₄(shell) hybrid nanostructures are rapidly synthesized by a plasmon-driven anti-replacement reaction. The Au nanoparticles are prepared by pulsed laser ablation in water. The mixture of Au nanoparticles and FeCl₃ solution is irradiated under a laser with a specific wavelength. The Fe³⁺ ions are reduced to low valence species by the 'hot electrons' in Au, and form the Fe₃O₄ spindles on the surface of Au nanoparticles. The Au nanoparticles are synchronously oxidized to Au⁺ and Au³⁺ ions by the 'hot holes'. The saturation magnetization and coercivity of Fe₃O₄ spindles are 48.7 emu g^-1 and 218.9 Oe, respectively. Our work provides a facile route to obtain the naked Au/Fe₃O₄ plasmonic/magnetic nanostructures.