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Title: Room-temperature synthesis and characterization of carbon-encapsulated molybdenum nanoparticles

Abstract

Highlights: • Carbon-encapsulated molybdenum nanoparticles were synthesized at room temperature. • Different hydrocarbons were used as carbon source for shell formation. • Increase of hydrocarbon mole ratio resulted in decrease of Mo-based nanoparticle cores. • Increase of laser pulses number resulted in increase of Mo content in CEMNPs. • Carbon shells prevented Mo nanoparticles from aggregation. - Abstract: Carbon-encapsulated molybdenum nanoparticles were synthesized by laser-assisted photolysis of gaseous precursors. In the proposed method, gas mixtures containing various hydrocarbons and molybdenum hexacarbonyl vapor diluted in argon were irradiated with a nanosecond pulsed UV laser at room temperature. Particle samples were analyzed by transmission electron microscopy (TEM), electron microdiffraction (EMD), energy-dispersive X-ray spectroscopy (EDS), and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) techniques to observe the morphology and composition of the Mo/C nanoparticles. The influence of the type of hydrocarbon, its mole fraction, and the number of UV laser pulses on the resulting nanoparticles was investigated. The nanoparticles were heavily aggregated and consisted of Mo-based cores surrounded by carbon. The type of hydrocarbon did not have any visible effects on the nanoparticle structure and the size of the Mo-based cores or aggregates. Increasing the hydrocarbon mole fraction in the precursor mixturemore » led to an increase in the carbon content and decrease of the Mo-based core size. Increasing the number of UV laser pulses led to larger Mo cores.« less

Authors:
; ;  [1]
  1. Joint Institute for High Temperatures of the Russian Academy of Sciences, Izhorskaya st. 13 Bd.2, Moscow, 125412 (Russian Federation)
Publication Date:
OSTI Identifier:
22804055
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 103; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ARGON; CARBON; CARBON SOURCES; CARBONYLS; HYDROCARBONS; LASER RADIATION; MOLYBDENUM; NANOPARTICLES; PHOTOLYSIS; PULSED IRRADIATION; RADIATION EFFECTS; SYNTHESIS; TEMPERATURE RANGE 0273-0400 K; TRANSMISSION ELECTRON MICROSCOPY; ULTRAVIOLET RADIATION; X-RAY SPECTROSCOPY

Citation Formats

Eremin, A. V., Gurentsov, E.V., E-mail: gurentsov@ihed.ras.ru, Kolotushkin, R. N., and Musikhin, S. A. Room-temperature synthesis and characterization of carbon-encapsulated molybdenum nanoparticles. United States: N. p., 2018. Web. doi:10.1016/J.MATERRESBULL.2018.03.026.
Eremin, A. V., Gurentsov, E.V., E-mail: gurentsov@ihed.ras.ru, Kolotushkin, R. N., & Musikhin, S. A. Room-temperature synthesis and characterization of carbon-encapsulated molybdenum nanoparticles. United States. https://doi.org/10.1016/J.MATERRESBULL.2018.03.026
Eremin, A. V., Gurentsov, E.V., E-mail: gurentsov@ihed.ras.ru, Kolotushkin, R. N., and Musikhin, S. A. 2018. "Room-temperature synthesis and characterization of carbon-encapsulated molybdenum nanoparticles". United States. https://doi.org/10.1016/J.MATERRESBULL.2018.03.026.
@article{osti_22804055,
title = {Room-temperature synthesis and characterization of carbon-encapsulated molybdenum nanoparticles},
author = {Eremin, A. V. and Gurentsov, E.V., E-mail: gurentsov@ihed.ras.ru and Kolotushkin, R. N. and Musikhin, S. A.},
abstractNote = {Highlights: • Carbon-encapsulated molybdenum nanoparticles were synthesized at room temperature. • Different hydrocarbons were used as carbon source for shell formation. • Increase of hydrocarbon mole ratio resulted in decrease of Mo-based nanoparticle cores. • Increase of laser pulses number resulted in increase of Mo content in CEMNPs. • Carbon shells prevented Mo nanoparticles from aggregation. - Abstract: Carbon-encapsulated molybdenum nanoparticles were synthesized by laser-assisted photolysis of gaseous precursors. In the proposed method, gas mixtures containing various hydrocarbons and molybdenum hexacarbonyl vapor diluted in argon were irradiated with a nanosecond pulsed UV laser at room temperature. Particle samples were analyzed by transmission electron microscopy (TEM), electron microdiffraction (EMD), energy-dispersive X-ray spectroscopy (EDS), and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) techniques to observe the morphology and composition of the Mo/C nanoparticles. The influence of the type of hydrocarbon, its mole fraction, and the number of UV laser pulses on the resulting nanoparticles was investigated. The nanoparticles were heavily aggregated and consisted of Mo-based cores surrounded by carbon. The type of hydrocarbon did not have any visible effects on the nanoparticle structure and the size of the Mo-based cores or aggregates. Increasing the hydrocarbon mole fraction in the precursor mixture led to an increase in the carbon content and decrease of the Mo-based core size. Increasing the number of UV laser pulses led to larger Mo cores.},
doi = {10.1016/J.MATERRESBULL.2018.03.026},
url = {https://www.osti.gov/biblio/22804055}, journal = {Materials Research Bulletin},
issn = {0025-5408},
number = ,
volume = 103,
place = {United States},
year = {Sun Jul 15 00:00:00 EDT 2018},
month = {Sun Jul 15 00:00:00 EDT 2018}
}