Thermal stability of Pt nanoclusters interacting to carbon sublattice


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Abstract

The catalytic activity of Pt clusters is dependent not only on the nanoparticle size and its composition, but also on its internal structure. To determine the real structure of the nanoparticles used in catalysis, the boundaries of the thermal structure stability of Pt clusters to 8.0 nm in diameter interacting with carbon substrates of two types: a fixed α-graphite plane and a mobile substrate with the diamond structure. The effect of a substrate on the processes melting of Pt nanoclusters is estimated. The role of the cooling rate in the formation of the internal structure of Pt clusters during crystallization is studied. The regularities obtained in the case of “free” Pt clusters and Pt clusters on a substrate are compared. It is concluded that platinum nanoparticles with diameter D ≤ 4.0 nm disposed on a carbon substrate conserve the initial fcc structure during cooling.

About the authors

V. S. Baidyshev

Katanov State University of Khakassia

Email: ygafner@khsu.ru
Russian Federation, pr. Lenina 90, Abakan, 655000

Yu. Ya. Gafner

Katanov State University of Khakassia

Email: ygafner@khsu.ru
Russian Federation, pr. Lenina 90, Abakan, 655000

S. L. Gafner

Katanov State University of Khakassia

Author for correspondence.
Email: ygafner@khsu.ru
Russian Federation, pr. Lenina 90, Abakan, 655000

L. V. Redel

Katanov State University of Khakassia

Email: ygafner@khsu.ru
Russian Federation, pr. Lenina 90, Abakan, 655000

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