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<p>Tracking the structural evolution of colloidal nanocrystals (NCs) facilitates the mechanistic studies of their materials chemistry. NC engineering via phase transformation reveals the chemical and physical determinants that drive lattice-scale dynamic processes such as cation exchange. Here we employed NCs to demonstrate the cation exchange process from Cu<sub>3</sub>As to InAs and GaAs within nanocubes. The symmetry conversion in unit cells from cubic Cu<sub>3</sub>As to hexagonal InAs and GaAs can be described using a schematic cellular automaton model, which suggests a simplified cube-to-sphere transition. The strong covalent characteristics of III–V materials highlight the kinetic control that navigates the tailorable transformation through either an isotropic trajectory, leading to hollow structures, or a topotaxial trajectory, with abundant stacking faults. The reconstruction of complex covalent bonds is envisioned as the foundation for the synthesis of NCs.</p><p></p>

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Kinetic-controlled transformations of group-III arsenide nanocubes

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Binyu Wu,
  • Shengsong Yang,
  • Dai-Bei Yang,
  • Yu Jin,
  • Chang Liu,
  • Zhiying Yi,
  • Chenqi Fan,
  • Sungsu Kang,
  • Yugang Zhang,
  • Giulia Galli,
  • Joseph S. Francisco,
  • A. Paul Alivisatos

摘要

Tracking the structural evolution of colloidal nanocrystals (NCs) facilitates the mechanistic studies of their materials chemistry. NC engineering via phase transformation reveals the chemical and physical determinants that drive lattice-scale dynamic processes such as cation exchange. Here we employed NCs to demonstrate the cation exchange process from Cu3As to InAs and GaAs within nanocubes. The symmetry conversion in unit cells from cubic Cu3As to hexagonal InAs and GaAs can be described using a schematic cellular automaton model, which suggests a simplified cube-to-sphere transition. The strong covalent characteristics of III–V materials highlight the kinetic control that navigates the tailorable transformation through either an isotropic trajectory, leading to hollow structures, or a topotaxial trajectory, with abundant stacking faults. The reconstruction of complex covalent bonds is envisioned as the foundation for the synthesis of NCs.