Controlled Growth of Pd Nanocrystals by Interface Interaction on Monolayer MoS<sub>2</sub>: An Atom-Resolved <i>in Situ</i> Study.
basic_science · Level V
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- Record sourced from PubMed, PMID 38010863.
- Also identified by DOI 10.1021/acs.nanolett.3c03960.
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Abstract
The crystal growth kinetics is crucial for the controllable preparation and performance modulation of metal nanocrystals (NCs). However, the study of growth mechanisms is significantly limited by characterization techniques, and it is still challenging to <i>in situ</i> capture the growth process. Real-time and real-space imaging techniques at the atomic scale can promote the understanding of microdynamics for NC growth. Herein, the growth of Pd NCs on monolayer MoS<sub>2</sub> under different atmospheres was <i>in situ</i> studied by environmental transmission electron microscopy. Introducing carbon monoxide can modulate the diffusion of Pd monomers, resulting in the epitaxial growth of Pd NCs with a uniform orientation. The electron energy loss spectroscopy and theoretical calculations showed that the CO adsorption assured the specific exposed facets and good uniformity of Pd NCs. The insight into the gas-solid interface interaction and the microscopic growth mechanism of NCs may shed light on the precise synthesis of NCs on two-dimensional (2D) materials.