Construction of the Heterostructure of NiPt Truncated Octahedral Nanoparticle/MoS 2 and Its Interfacial Structure Evolution.

Interfacial atomic configuration plays a vital role in the structural stability and functionality of nanocomposites composed of metal nanoparticles (NPs) and two-dimensional semiconductors. In situ transmission electron microscope (TEM) provides a real-time technique to observe the interface structure at atomic resolution. Herein, we loaded bimetallic NiPt truncated octahedral NPs (TONPs) on MoS 2 nanosheets and constructed a NiPt TONPs/MoS 2 heterostructure. The interfacial structure evolution of NiPt TONPs on MoS 2 was in situ investigated using aberration-corrected TEM. It was observed that some NiPt TONPs exhibited lattice matching with MoS 2 and displayed remarkable stability under electron beam irradiation. Intriguingly, the rotation of an individual NiPt TONP can be triggered by the electron beam to match the MoS 2 lattice underneath. Furthermore, the coalescence kinetics of NiPt TONPs can be quantitatively described by the relationship between neck radius ( r ) and time ( t ), expressed as r n = Kt . Our work offers a detailed analysis of the lattice alignment relationship of NiPt TONPs on MoS 2 , which may enlighten the design and preparation of stable bimetallic metal NPs/MoS 2 heterostructures.