Synthesis of Magnetic Nanoparticles by Ultrashort Pulsed Laser Ablation of Iron in Different Liquids

Alexander Kanitz; Jan S Hoppius; María Del Mar Sanz; Marco Maicas; Andreas Ostendorf; Evgeny L Gurevich

doi:10.1002/cphc.201601252

Synthesis of Magnetic Nanoparticles by Ultrashort Pulsed Laser Ablation of Iron in Different Liquids

Chemphyschem. 2017 May 5;18(9):1155-1164. doi: 10.1002/cphc.201601252. Epub 2017 Mar 6.

Authors

Alexander Kanitz¹, Jan S Hoppius¹, María Del Mar Sanz², Marco Maicas², Andreas Ostendorf¹, Evgeny L Gurevich¹

Affiliations

¹ Applied Laser Technologies, Ruhr-Universität Bochum, Universitätsstr.150, 44801, Bochum, Germany.
² Instituto de Sistemas Optoelectrónicos y Microstecnología (ISOM), E.T.S.I.T-U.P.M., Avda. Complutense 30, 28004, Madrid, Spain.

PMID: 28188671
DOI: 10.1002/cphc.201601252

Abstract

Magnetic nanoparticles were generated by ultrashort pulsed laser ablation of an iron target in water, methanol, ethanol, acetone and toluene. The relationship between ablation rate, liquid properties and the physical and chemical properties of the nanoparticles was studied. Composition, morphology and magnetic properties were investigated by TEM, XPS and vibrating-sample (VSM) and SQUID magnetometry. The properties of the generated nanoparticle ensembles reflected the influence of the liquid environment on the particle formation process. For example, the composition was strongly dependent on the carbon to oxygen ratio within the molecules of the liquid. In contrast to short pulsed laser ablation in liquids, the nanoparticles generated by ultrashort pulses had a higher level of polycrystallinity.

Keywords: femtosecond lasers; iron; laser ablation; magnetism; nanoparticles.