A total scattering Debye function analysis study of faulted Pt nanocrystals embedded in a porous matrix.
Faulted face-centred cubic platinum nanocrystals, grown within a nanoporous silica matrix, have been extensively characterized by the Debye function analysis method applied to wide-angle synchrotron X-ray total scattering data. A method for building databases of sampled interatomic distances of weakly faulted materials is proposed, maintaining statistical significance and allowing complete populations of differently sized and shaped nanocrystals to be used within the DEBUSSY approach. This study suggests that anisotropic Pt nanoclusters are formed in the presence of a shape-directing (templating) agent, and tentatively describes the effects of post-synthetic temperature treatments on fault probability, size, shape and dispersion of the nanocrystal populations. Surface relaxation effects are also observed in the smallest particles.
Dipartimento di Scienza e Alta Tecnologia and To.Sca.Lab, University of Insubria, via Valleggio 11, Como, 22100, Italy.
Federica
F
Bertolotti
Dipartimento di Scienza e Alta Tecnologia and To.Sca.Lab, University of Insubria, via Valleggio 11, Como, 22100, Italy.
Daniele
D
Moscheni
Istituto per la Microelettronica e i Microsistemi, Consiglio Nazionale delle Ricerche, via Piero Gobetti 101, Bologna, 40129, Italy.
Andrea
A
Migliori
Dipartimento di Chimica Industriale `Toso Montanari', Università di Bologna, Viale Risorgimento 4, Bologna, 40136, Italy.
Stefano
S
Zacchini
SLS, Laboratory for Synchrotron Radiation C, Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
Antonio
A
Cervellino
Istituto di Cristallografia and To.Sca.Lab, Consiglio Nazionale delle Ricerche, via Valleggio 11, Como, 22100, Italy.
Antonietta
A
Guagliardi
Dipartimento di Scienza e Alta Tecnologia and To.Sca.Lab, University of Insubria, via Valleggio 11, Como, 22100, Italy.
Norberto
N
Masciocchi
Debye scattering equation; platinum nanocrystals; stacking faults