Influence of misfit dislocations on nanoisland decay

Atomistic investigation of coarsening kinetics of supported nanoparticles using the phase field crystal model

“…31 Moreover, the existence of the moiré pattern also contributes to the decrease of the coarsening rate. 9 Sprodowski et al 5 investigated the decay of supported nano-islands with a lattice mismatch equal to 13% and reported similar conclusions.…”

“…[1][2][3] And a difference in lattice constants between the deposit and substrate could result in a superstructure in heteroepitaxy. 4 Sprodowski et al 5 checked the influence of such structures on the decay of monolayer nanoparticles and indicated that particles with a low activation energy barrier for diffusion on the support showed faster coarsening kinetics. 6 Asoro et al 7 reported that nanoparticles could move on the surface of supports.…”

“…[10][11][12][13] Coarsening kinetics are often analyzed by the LSW theory and its related models; however, as these models ignore the crystalline nature of particles, 14,15 a coarsening model for supported nanocrystals is still needed. To further our understanding of coarsening in atomic scales, coarsening kinetic processes have been widely investigated by experiments and simulations, such as 3D X-ray diffraction, 16 scanning tunneling microscopy, 5,17,18 transmission electron microscopy, 7,19,20 first-principles kinetics calculations, 21 kinetic Monte Carlo simulations, 22 and molecular dynamics simulations. 23 Since it is not easy to observe the growth of nanoparticles on different supports in situ within a reasonable time frame by these methods, the atomistic coarsening mechanism of supported nanoparticles and the influence of substrates' lattice structures on the coarsening kinetics remain to be explored.…”

Coarsening Process of Nanoparticles on Substrates by the Phase-Field Crystal Model

“…As shown in Figure 4, there is a superstructure on the nanoparticle, which is more pronounced for larger particles, and each cell contains three atomic matching relations in Figure 1. The size of the unit cell (the region enclosed by the red quadrilateral in Figure 4a) is mainly affected by the lattice mismatch, 16 the crystal misorientation between the substrate and the nanoparticles, and the strength of the pinning potential. With the increase of the misorientation, the size of the unit cell will be decreased, while with the increase of V, the size is increased.…”

“…Therefore, a deep understanding of the coarsening kinetics of nanoparticles on substrates is of great fundamental and critical importance for controlling the material properties. The current model to describe the coarsening kinetics is based on the classical work of Lifshitz and Slyozov and Wagner which is known as the LSW theory; however, it cannot quantitatively describe the coarsening process of nanoparticles because the model ignores the effect of the crystallographic characteristics of the particles. , During the past decade, the coarsening of nanoparticles on substrates was widely investigated by scanning tunneling microscopy, transmission electron microscopy, , scanning transmission electron microscopy, and atomic resolution transmission electron microscopy . However, observing the coarsening process in situ on an atomic scale is still very difficult, and the atomistic coarsening mechanism of nanoparticles on substrates remains largely unknown.…”