Photothermal response of laser-prepared colloidal solutions based on substoichiometric molybdenum oxide

Abstract

Suspensions of monolayer tungsten disulfide (WS2) were prepared by adding WS2 powder to test tubes with deionized water and ethanol, and then placed in an ultrasonic bath. The obtained WS2 suspensions with concentrations of 0.2 and 1 mg/ml were subjected to femtosecond laser ablation and fragmentation. The experiments were carried out on a laser robotic complex based on the Yb:KGW femtosecond laser system (280 fs, 1030 nm, 10 kHz, 150 µJ, Avesta Ltd.).
Optical and photosensitive properties of colloidal systems were measured. We used laser radiation from a continuous diode laser source with a wavelength of 800 nm and an average laser power of 1 W. The attenuated laser beam coming out of the tube was measured using a power meter. A thermal imager from the surface of the quartz tube wall recorded thermal processes. The photosensitivity characteristics were measured during the time required to reach the maximum temperature in the zone of exposure to the laser beam. During the measurement, the time of reaching the maximum temperature was recorded, as well as the transmitted laser radiation.
The study of the processes of formation of nanoparticles was carried out at the expense of the grant of the Russian Science Foundation No. 22-79-10348. Preparation and analysis of samples was carried out within the framework of the state assignment of the Ministry of Science and Higher Education of the Russian Federation, subject FZUN-2020-0013.

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Kirill S. Khorkov
Vladimir State University
Russia

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