Research output: Contribution to journal › Article › peer-review
Successful synthesis and thermal stability of immiscible metal Au-Rh, Au-Ir andAu-Ir-Rh nanoalloys. / Shubin, Yury; Plyusnin, Pavel; Sharafutdinov, Marat et al.
In: Nanotechnology, Vol. 28, No. 20, 205302, 25.04.2017.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Successful synthesis and thermal stability of immiscible metal Au-Rh, Au-Ir andAu-Ir-Rh nanoalloys
AU - Shubin, Yury
AU - Plyusnin, Pavel
AU - Sharafutdinov, Marat
AU - Makotchenko, Evgenia
AU - Korenev, Sergey
PY - 2017/4/25
Y1 - 2017/4/25
N2 - 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] x [Rh(NO2)6]1-x 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.nergy 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.
AB - 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] x [Rh(NO2)6]1-x 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.nergy 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.
KW - gold
KW - immiscible metal nanoalloys
KW - iridium
KW - rhodium
KW - single-source precursors
KW - thermal decomposition
KW - thermal stability
KW - SUPPORTED GOLD NANOPARTICLES
KW - ALLOY NANOPARTICLES
KW - CO
KW - HYDROGEN
KW - LOW-TEMPERATURE OXIDATION
KW - PD
KW - CATALYTIC-ACTIVITY
KW - FEPT NANOPARTICLES
KW - PHASE-DIAGRAMS
KW - BIMETALLIC NANOPARTICLES
UR - http://www.scopus.com/inward/record.url?scp=85018990276&partnerID=8YFLogxK
U2 - 10.1088/1361-6528/aa6bc9
DO - 10.1088/1361-6528/aa6bc9
M3 - Article
AN - SCOPUS:85018990276
VL - 28
JO - Nanotechnology
JF - Nanotechnology
SN - 0957-4484
IS - 20
M1 - 205302
ER -
ID: 10193995