Synthesis, Structure and Optical Properties of the Laser Synthesized Al2O3 Nanopowders Depending on the Crystallite Size and Vaporization Atmosphere | Sciact - CRIS-system of Boreskov Institute of Catalysis

Synthesis, Structure and Optical Properties of the Laser Synthesized Al2O3 Nanopowders Depending on the Crystallite Size and Vaporization Atmosphere Full article

Journal

Advanced Powder Technology
ISSN: 0921-8831 , E-ISSN: 1568-5527

Output data

Year: 2021, Volume: 32, Number: 8, Pages: 2733-2742 Pages count : 10 DOI: 10.1016/j.apt.2021.05.044

Tags

Al2O3 nanoparticles; Size effect; Laser vaporization; Physical vapor deposition; F-centers; 3d elements; Hydroxyl groups

Authors

Kostyukov Anton I. ^1,2 , Snytnikov Vladimir N. ² , Yelisseyev Alexander P. ^1,3 , Zhuzhgov Aleksey V. ² , Kostyukova Nadezhda Y. ^1,4,5 , Ishchenko Arcady V. ² , Cherepanova Svetlana V. ² , Snytnikov Valeriy N. ²

Affiliations

1	Novosibirsk State University, Pirogova Str. 2, 630090 Novosibirsk, Russia
2	Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, 630090 Novosibirsk, Russia
3	V.S. Sobolev Institute of Geology and Mineralogy, SB RAS, 630090 Novosibirsk, Russia
4	Institute of Laser Physics SB RAS, Lavrentiev Ave. 15b, 630090 Novosibirsk, Russia
5	Novosibirsk State Technical University, K. Marx Ave. 20, 630073 Novosibirsk, Russia

Funding (2)

1	Russian Foundation for Basic Research	19-32-60027 (АААА-А19-119110590010-0)
2	Ministry of Science and Higher Education of the Russian Federation	0239-2021-0011

A series of Al2O3 nanoparticles with the sizes ranging from ~ 2 to 21 nm, according to XRD, HRTEM and BET, was obtained by vaporization of α-Al2O3 in flowing helium and argon at different pressures under the action of a cw CO2 laser. The particle size was changed by varying the composition of ambient gas (He, Ar) and its pressure in a vaporization chamber from 0.034 to 0.9 bar. The effect of the synthesis conditions on the properties of Al2O3 nanopowders is presented and discussed. Particles with the size smaller than 6–7 nm have a faceted shape, whereas the shape of larger particles is close to spherical. It was found that the resulting nanopowders consist of a mixture of transition aluminas, among which the γ-polymorph is dominant. Thermal analysis showed that for smaller nanoparticles the phase transition to α-Al2O3 occurs at a lower temperature. In nominally pure Al2O3 nanoparticles with different sizes, photoluminescence at RT and 80 K is determined by trace level concentrations (≤10–3 wt%) of uncontrolled impurities of 3d elements (Cr3+(Oh) and Fe3+(Td)), surface hydroxyl groups, and point defects represented mostly by F-type centers. The acquired experimental data indicate that manifestation of the size effect for Al2O3 nanoparticles has a boundary corresponding to 6–7 nm. Al2O3 nanoparticles with the dominant γ-Al2O3 structure obtained by the laser method can be promising in many chemical reactions, particularly as the supports of catalysts and sorbents, for which the high specific surface area is of special importance.

Kostyukov A.I. , Snytnikov V.N. , Yelisseyev A.P. , Zhuzhgov A.V. , Kostyukova N.Y. , Ishchenko A.V. , Cherepanova S.V. , Snytnikov V.N.
Synthesis, Structure and Optical Properties of the Laser Synthesized Al2O3 Nanopowders Depending on the Crystallite Size and Vaporization Atmosphere
Advanced Powder Technology. 2021. V.32. N8. P.2733-2742. DOI: 10.1016/j.apt.2021.05.044 WOS Scopus РИНЦ AN OpenAlex

Submitted:	Jan 18, 2021
Accepted:	May 23, 2021
Published online:	Jun 4, 2021
Published print:	Aug 1, 2021

Web of science:	WOS:000681313400006
Scopus:	2-s2.0-85108721999
Elibrary:	46844628
Chemical Abstracts:	2021:1333498
OpenAlex:	W3166853237

DB	Citing
Scopus	16
Web of science	14
Elibrary	18
OpenAlex	19