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Thermal expansion coefficient of carbon‐supported Pt nanoparticles: In‐situ X‐ray diffraction study
Author(s) -
Leontyev I. N.,
Kulbakov A. A.,
Allix M.,
Rakhmatullin A.,
Kuriganova A. B.,
Maslova O. A.,
Smirnova N. V.
Publication year - 2017
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201600695
Subject(s) - tec , thermal expansion , materials science , nanoparticle , diffraction , carbon fibers , particle size , grain size , analytical chemistry (journal) , x ray crystallography , nanotechnology , composite material , chemistry , optics , physics , organic chemistry , ionosphere , astronomy , composite number
The thermal expansion of carbon‐supported Pt nanoparticles with different particle size has been studied in‐situ via X‐ray diffraction at temperatures from 100 to 300 K. The thermal expansion coefficient (TEC) of investigated Pt/C nanoparticles is always superior to that of bulk Pt. When the grain size D decreases from 11 to 3 nm, the TEC nonlinearly increases by about 1.66 × 10 −6 K −1 which corresponds to a variation of ∼20% from bulk Pt. The obtained experimental dependence of TEC for Pt/C nanoparticles has been interpreted using different theoretical approaches. A comparison of the considered models with the experimental data reveals the best agreement from the binding order–length–strength model with the size dependence of TEC experimentally found in carbon‐supported Pt nanoparticles.