Science Advances

Supplementary Materials

The PDF file includes:

  • Electron beam effects during in situ TEM characterization
  • Internanocrystal interaction responsible for nanocrystal deformation
  • Kinetics of superlattice phase transitions in EG and EDA/EG
  • Perspective and open questions
  • Fig. S1. Schematic illustration of the liquid cell fabrication and real-time in situ TEM imaging of nanocrystal superlattice phase transitions.
  • Fig. S2. STEM images of randomly oriented nanocrystals in initial unconnected hexagonal superlattice.
  • Fig. S3. Moving-apart motion of neighboring nanocrystals during superlattice phase transitions.
  • Fig. S4. Reversible deformation of nanocrystals marked by 7 and 10.
  • Fig. S5. Retained deformation of nanocrystals during the oriented attachment in EDA solution.
  • Fig. S6. Reduced deformation of nanocrystals during the superlattice transformation in EG.
  • Fig. S7. Different pathways of superlattice transformations in EG and EDA/EG.
  • Fig. S8. EDS analyses of superlattices before and after phase transitions.
  • Fig. S9. Schematic of EDA-induced ligand removal.
  • Fig. S10. Molecular dynamics simulation on the deformability of nondipolar PbSe nanocrystals.
  • Legends for movies S1 to S10

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Other Supplementary Material for this manuscript includes the following:

  • Movie S1 (.mov format). In situ liquid-phase TEM movie showing the phase transition of PbSe nanocrystals in EDA solution.
  • Movie S2 (.mov format). Reconstructed 3D atomistic model of PbSe nanocrystals in unconnected hexagonal superlattices.
  • Movie S3 (.mov format). In situ liquid-phase TEM movie showing the dynamic deformability of nanocrystals in EDA solution.
  • Movie S4 (.mov format). In situ liquid-phase TEM movie showing the reversible deformation of nanocrystals in EDA solution.
  • Movie S5 (.mov format). In situ liquid-phase TEM movie showing the transformation from a hexagonal superlattice to two nanocrystal chains in EDA solution.
  • Movie S6 (.mov format). In situ liquid-phase TEM movie showing retained deformation of nanocrystals during the oriented attachment in EDA solution.
  • Movie S7 (.mov format). In situ liquid-phase TEM movie showing the lattice alignment of neighboring nanocrystals during the oriented attachment in EDA solution. .
  • Movie S8 (.mov format). In situ liquid-phase TEM movie showing the phase transition from hexagonal to square superlattices in pure EG.
  • Movie S9 (.mov format). In situ liquid-phase TEM movie showing reduced deformation of nanocrystals during the superlattice transformation in EG.
  • Movie S10 (.mov format). In situ heating TEM movie showing no perceptible deformation of individual nanocrystals without introducing any EDA or EG solution.

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