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Peer-reviewedCC BY-NC-NDACS nanoscience Au

In Situ TEM Observation of the Coalescence between Immiscible Au and Rh Nanoparticles to Form AuRh Heterostructures.

  • Yufan Zhou1
  • Wenxin Wen1
  • Shiqi Yang1
  • Xianzhuo Lao1
  • Jie Liu1
  • Fan Zhu1
  • Pengcheng Xu2
  • Peng-Cheng Chen1,3
  1. 1College of Smart Materials and Future Energy, State Key Laboratory of Coatings for Advanced Equipment, Fudan University, Shanghai 200438, China.
  2. 2State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.
  3. 3International Institute for Intelligent Nanorobots and Nanosystems, Fudan University, Shanghai 200438, China.
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Abstract

The performance of heterostructured nanoparticles across diverse applications is closely related to the structure of their interfaces, yet how lattice mismatch and thermodynamic miscibility dictate the assembly of monometallic nanoparticle to form bimetallic interfaces is not well understood. In this study, we combined in situ transmission electron microscopy and molecular dynamics simulations to investigate the collision dynamics of immiscible Au and Rh nanoparticles. It is found that the interfacial structure between Au and Rh is highly sensitive to the local environment of nanoparticle collision. The collision between individual Au and Rh nanoparticles favors the formation of lattice-coherent and defect-free interfaces through rotational alignment of the nanoparticles. This oriented attachment, observed along (111), (100), or (110) facets, is thermodynamically driven by the minimization of the interfacial energy. In particular, the coherent Au-Rh interfaces show significantly lower energy and strain compared with that of noncoherent Au-Rh interfaces, as confirmed by molecular dynamics simulations. In contrast, multinanoparticle collisions introduce spatial constraints that suppress rotational freedom of the monometallic nanoparticles, creating kinetically trapped noncoherent heterostructures with strains and rich defects at the interfaces. The results unravel the thermodynamic and kinetic factors that dictate the growth pathways of bimetallic heterostructures, providing guidance for the construction of nanoparticles with controlled phase boundaries.

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Cite

BibTeXRIS
BibTeX
@article{zhou2026situ,
  title = {{In Situ TEM Observation of the Coalescence between Immiscible Au and Rh Nanoparticles to Form AuRh Heterostructures.}},
  author = {Yufan Zhou and Wenxin Wen and Shiqi Yang and Xianzhuo Lao and Jie Liu and Fan Zhu and Pengcheng Xu and Peng-Cheng Chen},
  journal = {ACS nanoscience Au},
  year = {2026},
  month = sep,
  doi = {10.1021/acsnanoscienceau.6c00086},
  url = {https://europepmc.org/article/MED/42921426},
  note = {CC BY-NC-ND},
}
RIS
TY  - JOUR
TI  - In Situ TEM Observation of the Coalescence between Immiscible Au and Rh Nanoparticles to Form AuRh Heterostructures.
AU  - Yufan Zhou
AU  - Wenxin Wen
AU  - Shiqi Yang
AU  - Xianzhuo Lao
AU  - Jie Liu
AU  - Fan Zhu
AU  - Pengcheng Xu
AU  - Peng-Cheng Chen
PY  - 2026
DA  - 2026/09/02
JO  - ACS nanoscience Au
DO  - 10.1021/acsnanoscienceau.6c00086
UR  - https://europepmc.org/article/MED/42921426
AB  - The performance of heterostructured nanoparticles across diverse applications is closely related to the structure of their interfaces, yet how lattice mismatch and thermodynamic miscibility dictate the assembly of monometallic nanoparticle to form bimetallic interfaces is not well understood. In this study, we combined in situ transmission electron microscopy and molecular dynamics simulations to investigate the collision dynamics of immiscible Au and Rh nanoparticles. It is found that the interfacial structure between Au and Rh is highly sensitive to the local environment of nanoparticle collision. The collision between individual Au and Rh nanoparticles favors the formation of lattice-coherent and defect-free interfaces through rotational alignment of the nanoparticles. This oriented attachment, observed along (111), (100), or (110) facets, is thermodynamically driven by the minimization of the interfacial energy. In particular, the coherent Au-Rh interfaces show significantly lower energy and strain compared with that of noncoherent Au-Rh interfaces, as confirmed by molecular dynamics simulations. In contrast, multinanoparticle collisions introduce spatial constraints that suppress rotational freedom of the monometallic nanoparticles, creating kinetically trapped noncoherent heterostructures with strains and rich defects at the interfaces. The results unravel the thermodynamic and kinetic factors that dictate the growth pathways of bimetallic heterostructures, providing guidance for the construction of nanoparticles with controlled phase boundaries.
SN  - 2694-2496
ER  -