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Contribution Poster

X-ray spectroscopy

XAFS study of platinum–gold alloyed nanosystem

Speakers

  • Dr. Vladimir KRIVENTSOV

Primary authors

  • Prof. Yury SHUBIN (Nikolaev Institute of Inorganic Chemistry, Novosibirsk State University)

Co-authors

Content

Recently, new functional materials containing nanosized particles consisting of two or more precious metals attract great interest, because ones are known to exhibit unique chemical and physical properties, which differ from that of monometallic particles. Amongst this new class of materials, metastable nanoalloys should be mentioned especially. The present work is devoted to the study of Au-Pt alloyed nanoparticles by XAFS spectroscopy method. The Au-Pt alloyed nanoparticles were prepared via decomposition of double complex salt [AuEn2]2[Pt(NO2)4]3•nH2O containing both inorganic and organic ligands. Decomposition of the precursor was performed in a reductive atmosphere with varied temperature ramping rates. All XAFS spectra of the Pt-L3, Au-L3 edges were recorded at Siberian Synchrotron and Terahertz Radiation Center (SSTRC, Novosibirsk). The study of the genesis of the state and local structure of the Au-Pt formed nanoparticles, including the study of initial precursors were carried out. According to XAFS data, both the ramping rate and the final temperature of decomposition strongly affect the Pt–Au ratio in alloyed nanoparticles which are being formed. The interatomic distances and corresponded coordination numbers were established. All possible structural models were discussed. Additionally, the samples of catalysts were characterized by the TEM, EDX, XRD methods. The data obtained by all the methods are in a good agreement. The work has been supported by grant of Russian Science Foundation (project №16-13-10192). Vladimir Kriventsov thanks to the Russian Foundation for Basic Research for support of the analysis of the local structure (projects No. 16-03-01139, 17-33-50198, 18-03-01251).