Successful Synthesis and Thermal Stability of Immiscible Metal Au–Rh, Au–Ir and Au–Ir–Rh Nanoalloys | Sciact - CRIS-system of Boreskov Institute of Catalysis

Successful Synthesis and Thermal Stability of Immiscible Metal Au–Rh, Au–Ir and Au–Ir–Rh Nanoalloys Full article

Journal

Nanotechnology
ISSN: 0957-4484 , E-ISSN: 1361-6528

Output data

Year: 2017, Volume: 28, Number: 20, Article number : 205302, Pages count : 11 DOI: 10.1088/1361-6528/aa6bc9

Tags

immiscible metal nanoalloys, gold, iridium, rhodium, single-source precursors, thermal decomposition, thermal stability

Authors

Shubin Yury ^1,2 , Plyusnin Pavel ^1,2 , Sharafutdinov Marat ³ , Makotchenko Evgenia ^1,2 , Korenev Sergey ^1,2

Affiliations

1	Nikolaev Institute of Inorganic Chemistry, 3, Acad. Lavrentiev Ave., Novosibirsk, 630090, Russia
2	Novosibirsk State University, 2, Pirogova Str., Novosibirsk. 630090, Russia
3	Institute of Solid State Chemistry and Mechanochemistry, 18, Kutateladze, Novosibirsk, 630128, Russia

We successfully prepared face-centred cubic nanoalloys in systems of Au–Ir, Au–Rh and Au–Ir–Rh, with large bulk miscibility gaps, in one-run reactions under thermal decomposition of specially synthesised single-source precursors, namely, [AuEn2][Ir(NO2)6], [AuEn2][Ir(NO2)6]х[Rh(NO2)6]1−х and [AuEn2][Rh(NO2)6]. The precursors employed contain all desired metals 'mixed' at the atomic level, thus providing significant advantages for obtaining alloys. The observations using high-resolution transmission electron microscopy show that the nanoalloy structures are composed of well-dispersed aggregates of crystalline domains with a mean size of 5 ± 3 nm. Еnergy dispersive x-ray spectroscopy and x-ray powder diffraction (XRD) measurements confirm the formation of AuIr, AuRh, AuIr0.75Rh0.25, AuIr0.50Rh0.50 and AuIr0.25Rh0.75 metastable solid solutions. In situ high-temperature synchrotron XRD (HTXRD) was used to study the formation mechanism of nanoalloys. The observed transformations are described by the 'conversion chemistry' mechanism characterised by the primary development of particles comprising atoms of only one type, followed by a chemical reaction resulting in the final formation of a nanoalloy. The obtained metastable nanoalloys exhibit essential thermal stability. Exposure to 180 °C for 30 h does not cause any dealloying process.

Shubin Y. , Plyusnin P. , Sharafutdinov M. , Makotchenko E. , Korenev S.
Successful Synthesis and Thermal Stability of Immiscible Metal Au–Rh, Au–Ir and Au–Ir–Rh Nanoalloys
Nanotechnology. 2017. V.28. N20. 205302 :1-11. DOI: 10.1088/1361-6528/aa6bc9 WOS Scopus РИНЦ AN OpenAlex

Submitted:	Feb 2, 2017
Accepted:	Apr 6, 2017
Published online:	Apr 25, 2017
Published print:	May 19, 2017

Web of science:	WOS:000406030000002
Scopus:	2-s2.0-85018990276
Elibrary:	31020209
Chemical Abstracts:	2018:1007659
OpenAlex:	W2605002176

DB	Citing
Web of science	29
Scopus	30
OpenAlex	28