CC BY
10LM-I-19
LASER-MATTER INTERACTION
Synthesis of copper nanoparticles by high-energy laser pulses in liquid
A.G. Putilov12, A.E Shepelev1, A.A. Antipovu
1ILIT RAS — Branch of FSRC "Crystallography and Photonics" RAS, Shatura, Russia 2 Vladimir State University named after Alexander Grigorievich and Nikolai Grigorievich Stoletovs,
Vladimir, Russia e-mail: antiplit@yandex.ru
The study of the synthesis of copper nanoparticles is due to their unique properties compared to bulk materials and their application in various fields. Recently, copper nanoparticles have found application in the formation of conductive films, the creation of nonlinear devices, and bactericidal agents [1]. The laser ablation method has advantages over chemical synthesis methods. By this method, the synthesis occurs in a short time, chemically pure substances are formed, and hybrid materials of dissimilar metals can also be obtained. The synthesized nanoparticles are also highly active and almost immediately ready for use [2].
Colloidal solutions of copper were formed by laser ablation of the material into a liquid. A copper target was placed into the liquid: distilled water and glycerin. The energy density of laser radiation on a copper target ranged from 33 to 52 J/cm2 [3]. The scanning speed did not exceed 2 mm/s. Under laser action on a target with a frequency of 5 Hz, the average particle size is about 20 nm, and an increase in the laser radiation frequency to 15 Hz leads to an increase in the average particle size to 150 nm. Such an increase is associated with a change in the laser beam profile, since an increase in frequency leads to an increase in the thermal lens. The absorption spectrum for colloidal solutions with synthesized copper nanoparticles was in the region of ~520 nm.
Further experimental studies are aimed at the formation of thin cluster films. Cluster films were formed on a solid dielectric substrate by drop deposition. In the first series, the experiments were carried out under natural conditions at a temperature of 25 °C. In the process of drying, a cluster thin film is formed with a clearly defined boundary and evenly deposited particles in the center. The second series of experiments is devoted to the forced evaporation of a liquid medium using laser radiation. The deposited surface is an island film, since there is a competition between two processes of diffusion of nanoparticles from the heating region and a hydrodynamic flow into the heating region.
Copper nanoparticles of the smallest size are synthesized at an energy of 52 J/cm2, a repetition rate of 5 Hz, and a scan rate of 2 mm/s. Increasing the frequency leads not only to a change in the beam profile, but also to an increase in the average particle size. The formation of cluster films during natural and forced evaporation of the liquid phase is demonstrated.
The reported study was funded by RFBR No. 20-32-90052, partly within the framework ofRFBR projects No. 19-2910022, 20-02-00515.
[1] Fernández-Arias, M., Boutinguiza, M., del Val, J., Covarrubias, C., Bastías, F., Gómez, L., Maureira, M., Arias-Gonzalez, F., Riveiro, A., & Pou, J. Copper nanoparticles obtained by laser ablation in liquids as bactericidal agent for dental applications. Applied Surface Science, 507, 145032. (2020).
[2] Kucherik, A. O., Ryabchikov, Y. V, Kutrovskaya, S. V, Al-Kattan, A., Arakelyan, S. M., Itina, T. E., & Kabashin, A. V. Cavita-tion-Free Continuous-Wave Laser Ablation from a Solid Target to Synthesize Low-Size-Dispersed Gold Nanoparticles. Chemphy-schem : a European journal of chemical physics and physical chemistry, 18(9), 1185-1191. (2017)
[3] Антипов А.А., Путилов А.Г., Осипов А.В., Шепелев А.Е., Лазерная абляция металлических мишеней в жидкости цугами наносекундных импульсов, Известия Российской академии наук. Серия физическая. Т. 86. № 6. С. 853-858.(2022).
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