Laser applications and other topics in quantum electronics

Study of efficiency of formation of core–satellite gold- and iron-based nanostructures by laser ablation synthesis

A. A. Laktionov^a, I. V. Sozaev^a, D. I. Tselikov^a, G. V. Tikhonowski^a, M. S. Grigor'eva^b, S. M. Klimentov^a, I. N. Zavestovskaya^bc, A. V. Kabashin^d, A. A. Popov<sup>a

a</sup> Institute for Physics and Engineering in Biomedicine, National Research Nuclear University MEPhI, 115409, Moscow, Russia
^b Lebedev Physical Institute of the Russian Academy of Sciences, 119991, Moscow, Russia
^c National Research Centre "Kurchatov Institute", 123182, Moscow, Russia
^d National Center for Scientific Research, LP3, Aix Marseille University, CNRS, 13288 Marseille, France

Abstract: We report the results of experimental work on laser synthesis of colloidal solutions of core–satellite nanostructures based on gold and iron (Au@Fe). The synthesis is optimized; the main result of optimization is an increase in the fraction of the synthesized Au@Fe nanoparticles (NPs) to 80% of the total number of NPs obtained while maintaining high synthesis productivity. The NPs synthesized using the optimized technology have a spherical shape with an average size of about 90 nm, and retain an optical extinction peak important for applications, which has a maximum of about 600 nm and a wide shoulder in the long-wavelength region. The Au@Fe nanoparticles are promising for use as a contrast agent in magnetic resonance and computed tomography, as well as sensitizers in photothermal and proton therapies.

Keywords: nanoparticles, satellite–core, magnetic particles, plasmon resonance, laser ablation in liquid, iron, gold.

Received: 01.08.2024
Revised: 15.08.2024

 English version: Quantum Electronics, 2024, 51:suppl. 7, S602–S607