Nanophysics in laser-induced cluster systems: topological quantum states in electrical conductivity and features of optical spectra—theory and experiment for dimensional effects

The paper presents the experimental results of nanostructures formation under the influence of femtosecond laser radiation on carbon samples at liquid nitrogen temperatures. Two femtosecond laser systems were used to study the processes of laser action on highly oriented pyrolytic graphite and glassy carbon samples in liquid nitrogen: titanium-sapphire laser system with wavelength 800 nm, pulse duration 50 fs, energy 1 mJ, and repetition frequency of 1 kHz; ytterbium laser system with wavelength 1030 nm, pulse duration 280 fs, energy 150 µJ, and repetition frequency of 10 kHz. Cryostats, including those with the possibility of observing the laser action process, were collected for the experiments. As a result of laser action on the surface of the processed carbon samples, sheets of exfoliated graphene of various sizes and shapes (sheets, tapes, crumpled graphene), as well as nanostructures in the form of nanopeaks, were obtained. The mechanisms of graphene exfoliation under femtosecond laser action in liquid nitrogen, consisting in intercalation and further heating of nitrogen molecules in the interplanar space of graphite, were proposed. The possibilities of further research and development of technologies for graphene formation using laser radiation are presented.

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Laser-induced methods for obtaining carbon nanomaterials in liquid nitrogen under femtosecond radiation

Khorkov

Prokoshev

Аракелян

2021

JAMT

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Magic Isomer of a Au20 Gold Nanocluster: Topological Model and Spectral Characteristics

Khudaberganov

Khudobin

Аракелян

2020

Bull. Russ. Acad. Sci. Phys.

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Electrophysics of carbon 1D structures obtained in a laser experiment: models and demonstration

Garnov,

Abramov,

Bukharov

et al. 2023

Phys. Usp.

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Laser-induced carbon 1D structures and some of their electrophysical properties have been studied by means of computer simulations. Evidence of the possible emergence of a new allotropic phase of carbon (carbyne) produced through laser melting of graphite has been experimentally demonstrated. Methods for obtaining topological nanoclusters of controlled modifications using laser ablation are discussed, and the obtained images are presented. The main results of modeling 1D structures with fractal fragments are considered. Raman spectra with corresponding confirmation of the existence of laser-induced low-dimensional carbon structures are displayed. The structures discovered enable the development of next-generation elements and devices for nanoelectronics and nanophotonics based on new physical principles.

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Nanophysics in laser-induced cluster systems: topological quantum states in electrical conductivity and features of optical spectra—theory and experiment for dimensional effects

Cited by 3 publications

References 14 publications

Laser-induced methods for obtaining carbon nanomaterials in liquid nitrogen under femtosecond radiation

Laser-induced methods for obtaining carbon nanomaterials in liquid nitrogen under femtosecond radiation

Magic Isomer of a Au20 Gold Nanocluster: Topological Model and Spectral Characteristics

Electrophysics of carbon 1D structures obtained in a laser experiment: models and demonstration

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