Computational assessment of the efficacy of halides as shape-directing agents in nanoparticle growth
Artikel i vetenskaplig tidskrift, 2020

We report a comprehensive study of aqueous halide adsorption on nanoparticles of gold and palladium that addresses several limitations hampering the use of atomistic modeling as a tool for understanding and improving wet-chemical synthesis and related applications. A combination of thermodynamic modeling with density functional theory (DFT) calculations and experimental data is used to predict equilibrium shapes of halide-covered nanoparticles as a function of the chemical environment. To ensure realistic and experimentally relevant results, we account for solvent effects and include a large set of vicinal surfaces, several adsorbate coverages, as well as decahedral particles. While the observed stabilization is not significant enough to result in thermodynamic stability of anisotropic shapes such as nanocubes, nonuniformity in the halide coverage indicates the possibility of obtaining such shapes as kinetic products. With regard to technical challenges, we show that inclusion of surface-solvent interactions leads to qualitative changes in the predicted shape. Furthermore, accounting for nonlocal interactions on the functional level yields a more accurate description of surface systems.

Nucleation on surfaces

Nanocrystals

Chemisorption

Growth

Chemical bonding

Adsorption

Författare

Joakim Löfgren

Chalmers, Fysik, Material- och ytteori

Magnus Rahm

Chalmers, Fysik, Kondenserad materie- och materialteori

Joakim Brorsson

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Paul Erhart

Chalmers, Fysik, Kondenserad materie- och materialteori

PHYSICAL REVIEW MATERIALS

2475-9953 (ISSN)

Vol. 4 9 096001

Ämneskategorier

Fysikalisk kemi

Annan kemi

Teoretisk kemi

DOI

10.1103/PhysRevMaterials.4.096001

Mer information

Senast uppdaterat

2020-11-23